diff --git a/src/lint/linter/__tests__/ArcanistLinterTestCase.php b/src/lint/linter/__tests__/ArcanistLinterTestCase.php
index b86a43b2..a6dc69b5 100644
--- a/src/lint/linter/__tests__/ArcanistLinterTestCase.php
+++ b/src/lint/linter/__tests__/ArcanistLinterTestCase.php
@@ -1,262 +1,326 @@
 <?php
 
 /**
  * Facilitates implementation of test cases for @{class:ArcanistLinter}s.
  */
 abstract class ArcanistLinterTestCase extends PhutilTestCase {
 
   /**
    * Returns an instance of the linter being tested.
    *
    * @return ArcanistLinter
    */
   protected function getLinter() {
     $matches = null;
     if (!preg_match('/^(\w+Linter)TestCase$/', get_class($this), $matches) ||
         !is_subclass_of($matches[1], 'ArcanistLinter')) {
       throw new Exception(pht('Unable to infer linter class name.'));
     }
 
     return newv($matches[1], array());
   }
 
   abstract public function testLinter();
 
   /**
    * Executes all tests from the specified subdirectory. If a linter is not
    * explicitly specified, it will be inferred from the name of the test class.
    */
   protected function executeTestsInDirectory($root) {
     $linter = $this->getLinter();
 
     $files = id(new FileFinder($root))
       ->withType('f')
       ->withSuffix('lint-test')
       ->find();
 
     $test_count = 0;
     foreach ($files as $file) {
       $this->lintFile($root.$file, $linter);
       $test_count++;
     }
 
     $this->assertTrue(
       ($test_count > 0),
       pht(
         'Expected to find some %s tests in directory %s!',
         '.lint-test',
         $root));
   }
 
   private function lintFile($file, ArcanistLinter $linter) {
     $linter = clone $linter;
 
     $contents = Filesystem::readFile($file);
     $contents = preg_split('/^~{4,}\n/m', $contents);
     if (count($contents) < 2) {
       throw new Exception(
         pht(
           "Expected '%s' separating test case and results.",
           '~~~~~~~~~~'));
     }
 
     list($data, $expect, $xform, $config) = array_merge(
       $contents,
       array(null, null));
 
     $basename = basename($file);
 
     if ($config) {
       $config = phutil_json_decode($config);
     } else {
       $config = array();
     }
     PhutilTypeSpec::checkMap(
       $config,
       array(
         'config' => 'optional map<string, wild>',
-        'path' => 'optional string',
         'mode' => 'optional string',
+        'path' => 'optional string',
         'stopped' => 'optional bool',
       ));
 
     $exception = null;
     $after_lint = null;
     $messages = null;
     $exception_message = false;
     $caught_exception = false;
 
     try {
       $tmp = new TempFile($basename);
       Filesystem::writeFile($tmp, $data);
       $full_path = (string)$tmp;
 
       $mode = idx($config, 'mode');
       if ($mode) {
         Filesystem::changePermissions($tmp, octdec($mode));
       }
 
       $dir = dirname($full_path);
       $path = basename($full_path);
 
       $working_copy = ArcanistWorkingCopyIdentity::newFromRootAndConfigFile(
         $dir,
         null,
         pht('Unit Test'));
       $configuration_manager = new ArcanistConfigurationManager();
       $configuration_manager->setWorkingCopyIdentity($working_copy);
 
 
       $engine = new ArcanistUnitTestableLintEngine();
       $engine->setWorkingCopy($working_copy);
       $engine->setConfigurationManager($configuration_manager);
 
       $path_name = idx($config, 'path', $path);
       $engine->setPaths(array($path_name));
 
       $linter->setEngine($engine);
       $linter->addPath($path_name);
       $linter->addData($path_name, $data);
 
       foreach (idx($config, 'config', array()) as $key => $value) {
         $linter->setLinterConfigurationValue($key, $value);
       }
 
       $engine->addLinter($linter);
       $engine->addFileData($path_name, $data);
 
       $results = $engine->run();
       $this->assertEqual(
         1,
         count($results),
         pht('Expect one result returned by linter.'));
 
       $assert_stopped = idx($config, 'stopped');
       if ($assert_stopped !== null) {
         $this->assertEqual(
           $assert_stopped,
           $linter->didStopAllLinters(),
           $assert_stopped
             ? pht('Expect linter to be stopped.')
             : pht('Expect linter to not be stopped.'));
       }
 
       $result = reset($results);
       $patcher = ArcanistLintPatcher::newFromArcanistLintResult($result);
       $after_lint = $patcher->getModifiedFileContent();
     } catch (PhutilTestTerminatedException $ex) {
       throw $ex;
     } catch (Exception $exception) {
       $caught_exception = true;
       if ($exception instanceof PhutilAggregateException) {
         $caught_exception = false;
         foreach ($exception->getExceptions() as $ex) {
           if ($ex instanceof ArcanistUsageException ||
               $ex instanceof ArcanistMissingLinterException) {
             $this->assertSkipped($ex->getMessage());
           } else {
             $caught_exception = true;
           }
         }
       } else if ($exception instanceof ArcanistUsageException ||
                  $exception instanceof ArcanistMissingLinterException) {
         $this->assertSkipped($exception->getMessage());
       }
       $exception_message = $exception->getMessage()."\n\n".
                            $exception->getTraceAsString();
     }
 
     $this->assertEqual(false, $caught_exception, $exception_message);
     $this->compareLint($basename, $expect, $result);
     $this->compareTransform($xform, $after_lint);
   }
 
-  private function compareLint($file, $expect, ArcanistLintResult $result) {
-    $seen = array();
-    $raised = array();
-    $message_map = array();
-
-    foreach ($result->getMessages() as $message) {
-      $sev = $message->getSeverity();
-      $line = $message->getLine();
-      $char = $message->getChar();
-      $code = $message->getCode();
-      $name = $message->getName();
-      $message_key = $sev.':'.$line.':'.$char;
-      $message_map[$message_key] = $message;
-      $seen[] = $message_key;
-      $raised[] = sprintf(
-        '  %s: %s %s',
-        pht('%s at line %d, char %d', $sev, $line, $char),
-        $code,
-        $name);
-    }
+  private function compareLint($file, $expect, ArcanistLintResult $results) {
+    $expected_results = new ArcanistLintResult();
+
     $expect = trim($expect);
     if ($expect) {
       $expect = explode("\n", $expect);
     } else {
       $expect = array();
     }
-    foreach ($expect as $key => $expected) {
-      $expect[$key] = head(explode(' ', $expected));
-    }
 
-    $expect = array_fill_keys($expect, true);
-    $seen   = array_fill_keys($seen, true);
+    foreach ($expect as $result) {
+      $parts = explode(':', $result);
+
+      $message = new ArcanistLintMessage();
+
+      $severity = idx($parts, 0);
+      $line     = idx($parts, 1);
+      $char     = idx($parts, 2);
+      $code     = idx($parts, 3);
+
+      if ($severity !== null) {
+        $message->setSeverity($severity);
+      }
+
+      if ($line !== null) {
+        $message->setLine($line);
+      }
+
+      if ($char !== null) {
+        $message->setChar($char);
+      }
+
+      if ($code !== null) {
+        $message->setCode($code);
+      }
 
-    if (!$raised) {
-      $raised = array(pht('No messages.'));
+      $expected_results->addMessage($message);
     }
-    $raised = sprintf(
-      "%s:\n%s",
-      pht('Actually raised'),
-      implode("\n", $raised));
 
-    foreach (array_diff_key($expect, $seen) as $missing => $ignored) {
-      $missing = explode(':', $missing);
-      $sev = array_shift($missing);
-      $pos = $missing;
+    $missing    = array();
+    $surprising = $results->getMessages();
 
-      $this->assertFailure(
-        pht(
-          "In '%s', expected lint to raise %s on line %d at char %d, ".
-          "but no %s was raised. %s",
-          $file,
-          $sev,
-          idx($pos, 0),
-          idx($pos, 1),
-          $sev,
-          $raised));
+    // TODO: Make this more efficient.
+    foreach ($expected_results->getMessages() as $expected_message) {
+      $found = false;
+
+      foreach ($results->getMessages() as $ii => $actual_message) {
+        if (!self::compareLintMessageProperty(
+          $expected_message->getSeverity(),
+          $actual_message->getSeverity())) {
+
+          continue;
+        }
+
+        if (!self::compareLintMessageProperty(
+          $expected_message->getLine(),
+          $actual_message->getLine())) {
+
+          continue;
+        }
+
+        if (!self::compareLintMessageProperty(
+          $expected_message->getChar(),
+          $actual_message->getChar())) {
+
+          continue;
+        }
+
+        if (!self::compareLintMessageProperty(
+          $expected_message->getCode(),
+          $actual_message->getCode())) {
+
+          continue;
+        }
+
+        $found = true;
+        unset($surprising[$ii]);
+      }
+
+      if (!$found) {
+        $missing[] = $expected_message;
+      }
     }
 
-    foreach (array_diff_key($seen, $expect) as $surprising => $ignored) {
-      $message = $message_map[$surprising];
-      $message_info = $message->getDescription();
+    if ($missing || $surprising) {
+      $expected = pht('EXPECTED MESSAGES');
+      if ($missing) {
+        foreach ($missing as $message) {
+          $expected .= sprintf(
+            "\n  %s: %s %s",
+            pht(
+              '%s at line %d, char %d',
+              $message->getSeverity(),
+              $message->getLine(),
+              $message->getChar()),
+            $message->getCode(),
+            $message->getName());
+        }
+      } else {
+        $expected .= "\n  ".pht('No messages');
+      }
+
+      $actual = pht('UNEXPECTED MESSAGES');
+      if ($surprising) {
+        foreach ($surprising as $message) {
+          $actual .= sprintf(
+            "\n  %s: %s %s",
+            pht(
+              '%s at line %d, char %d',
+              $message->getSeverity(),
+              $message->getLine(),
+              $message->getChar()),
+            $message->getCode(),
+            $message->getName());
+        }
+      } else {
+        $actual .= "\n  ".pht('No messages');
+      }
 
-      list($sev, $line, $char) = explode(':', $surprising);
       $this->assertFailure(
         sprintf(
-          "%s:\n\n%s\n\n%s",
-          pht(
-            "In '%s', lint raised %s on line %d at char %d, ".
-            "but nothing was expected",
-            $file,
-            $sev,
-            $line,
-            $char),
-          $message_info,
-          $raised));
+          "%s\n\n%s\n\n%s",
+          pht("Lint failed for '%s'.", $file),
+          $expected,
+          $actual));
     }
   }
 
   private function compareTransform($expected, $actual) {
     if (!strlen($expected)) {
       return;
     }
     $this->assertEqual(
       $expected,
       $actual,
       pht('File as patched by lint did not match the expected patched file.'));
   }
 
+  /**
+   * Compare properties of @{class:ArcanistLintMessage} instances.
+   *
+   * The expectation is that if one (or both) of the properties is null, then
+   * we don't care about its value.
+   *
+   * @param  wild
+   * @param  wild
+   * @return bool
+   */
+  private static function compareLintMessageProperty($x, $y) {
+    return $x === null || $y === null || $x === $y;
+  }
+
 }
diff --git a/src/lint/linter/__tests__/chmod/empty_executable.lint-test b/src/lint/linter/__tests__/chmod/empty_executable.lint-test
index 54e5a85c..cf8980b6 100644
--- a/src/lint/linter/__tests__/chmod/empty_executable.lint-test
+++ b/src/lint/linter/__tests__/chmod/empty_executable.lint-test
@@ -1,5 +1,5 @@
 ~~~~~~~~~~
-warning::
+warning:0:0:CHMOD1:Invalid Executable
 ~~~~~~~~~~
 ~~~~~~~~~~
 {"mode": "0755"}
diff --git a/src/lint/linter/__tests__/coffeelint/no_trailing_whitespace.lint-test b/src/lint/linter/__tests__/coffeelint/no_trailing_whitespace.lint-test
index 6b43ad21..87351e90 100644
--- a/src/lint/linter/__tests__/coffeelint/no_trailing_whitespace.lint-test
+++ b/src/lint/linter/__tests__/coffeelint/no_trailing_whitespace.lint-test
@@ -1,4 +1,4 @@
 x = 1234      
 y = 1
 ~~~~~~~~~~
-error:1:
+error:1:0
diff --git a/src/lint/linter/__tests__/filename/bad_filename.lint-test b/src/lint/linter/__tests__/filename/bad_filename.lint-test
index 7eb7c745..12ec5757 100644
--- a/src/lint/linter/__tests__/filename/bad_filename.lint-test
+++ b/src/lint/linter/__tests__/filename/bad_filename.lint-test
@@ -1,5 +1,5 @@
 ~~~~~~~~~~
-error::
+error:0:0:NAME1:Bad Filename
 ~~~~~~~~~~
 ~~~~~~~~~~
 {"path": "bad@filename"}
diff --git a/src/lint/linter/__tests__/flake8/undefined.lint-test b/src/lint/linter/__tests__/flake8/undefined.lint-test
index 2f8a2548..72a09df0 100644
--- a/src/lint/linter/__tests__/flake8/undefined.lint-test
+++ b/src/lint/linter/__tests__/flake8/undefined.lint-test
@@ -1,7 +1,7 @@
 x = 'y'
 
 def hello():
     return foo
 ~~~~~~~~~~
-error:3:1
-error:4:12
+error:3:1:E302
+error:4:12:F821
diff --git a/src/lint/linter/__tests__/jshint/dot-notation.lint-test b/src/lint/linter/__tests__/jshint/dot-notation.lint-test
index 681e3505..53cf0f91 100644
--- a/src/lint/linter/__tests__/jshint/dot-notation.lint-test
+++ b/src/lint/linter/__tests__/jshint/dot-notation.lint-test
@@ -1,6 +1,6 @@
 var args = {};
 args['foo'] = 'bar';
 args['bar'] = 'baz';
 ~~~~~~~~~~
-warning:2:5
-warning:3:5
+warning:2:5:W069
+warning:3:5:W069
diff --git a/src/lint/linter/__tests__/jshint/expected-conditional.lint-test b/src/lint/linter/__tests__/jshint/expected-conditional.lint-test
index 2b229273..42b75257 100644
--- a/src/lint/linter/__tests__/jshint/expected-conditional.lint-test
+++ b/src/lint/linter/__tests__/jshint/expected-conditional.lint-test
@@ -1,6 +1,6 @@
 var foo;
 if (foo = 'bar') {
   return true;
 }
 ~~~~~~~~~~
-warning:2:16
+warning:2:16:W084
diff --git a/src/lint/linter/__tests__/jshint/jshint.lint-test b/src/lint/linter/__tests__/jshint/jshint.lint-test
index edb1c779..954e1033 100644
--- a/src/lint/linter/__tests__/jshint/jshint.lint-test
+++ b/src/lint/linter/__tests__/jshint/jshint.lint-test
@@ -1,12 +1,12 @@
 function f() {
   for (ii = 0; ii < 3; ii++) {
     g()
   }
 }
 
 {
 
 ~~~~~~~~~~
-warning:3:8
-error:7:1
-error:9:1
+warning:3:8:W033
+error:7:1:E019
+error:9:1:E041
diff --git a/src/lint/linter/__tests__/jshint/missing-semicolon.lint-test b/src/lint/linter/__tests__/jshint/missing-semicolon.lint-test
index a6669698..23ba765b 100644
--- a/src/lint/linter/__tests__/jshint/missing-semicolon.lint-test
+++ b/src/lint/linter/__tests__/jshint/missing-semicolon.lint-test
@@ -1,3 +1,3 @@
 console.log('foobar')
 ~~~~~~~~~~
-warning:1:22
+warning:1:22:W033
diff --git a/src/lint/linter/__tests__/jshint/too-many-errors.lint-test b/src/lint/linter/__tests__/jshint/too-many-errors.lint-test
index 6dbea1f9..e7b936dd 100644
--- a/src/lint/linter/__tests__/jshint/too-many-errors.lint-test
+++ b/src/lint/linter/__tests__/jshint/too-many-errors.lint-test
@@ -1,5 +1,5 @@
 /* jshint maxerr: 1 */
 console.log('foobar')
 ~~~~~~~~~~
-disabled:2:22
-warning:2:22
+disabled:2:22:E043
+warning:2:22:W033
diff --git a/src/lint/linter/__tests__/jshint/unnecessary-semicolon.lint-test b/src/lint/linter/__tests__/jshint/unnecessary-semicolon.lint-test
index 14eafbdf..04c627ca 100644
--- a/src/lint/linter/__tests__/jshint/unnecessary-semicolon.lint-test
+++ b/src/lint/linter/__tests__/jshint/unnecessary-semicolon.lint-test
@@ -1,5 +1,5 @@
 function main() {
   return 'Hello, World!';
 };
 ~~~~~~~~~~
-warning:3:2
+warning:3:2:W032
diff --git a/src/lint/linter/__tests__/mergeconflict/mergeconflict.lint-test b/src/lint/linter/__tests__/mergeconflict/mergeconflict.lint-test
index 3e30be52..71b7d4aa 100644
--- a/src/lint/linter/__tests__/mergeconflict/mergeconflict.lint-test
+++ b/src/lint/linter/__tests__/mergeconflict/mergeconflict.lint-test
@@ -1,10 +1,10 @@
 {
     "foo": "bar",
 <<<<<<< HEAD
     "bar": "baz"
 =======
     "baz": "foo"
 >>>>>>> branch2
 }
 ~~~~~~~~~~
-error:5:1
+error:5:1:MERGECONFLICT1:Unresolved merge conflict
diff --git a/src/lint/linter/__tests__/pep8/imports.lint-test b/src/lint/linter/__tests__/pep8/imports.lint-test
index cd9b2287..71f0ad21 100644
--- a/src/lint/linter/__tests__/pep8/imports.lint-test
+++ b/src/lint/linter/__tests__/pep8/imports.lint-test
@@ -1,3 +1,3 @@
 import os, sys
 ~~~~~~~~~~
-error:1:10
+error:1:10:E401
diff --git a/src/lint/linter/__tests__/php/fatal.lint-test b/src/lint/linter/__tests__/php/fatal.lint-test
index cf13b0cd..6d3c7b82 100644
--- a/src/lint/linter/__tests__/php/fatal.lint-test
+++ b/src/lint/linter/__tests__/php/fatal.lint-test
@@ -1,7 +1,7 @@
 <?php
 
 function f() {
   $this = "cannot be re-assigned";
 }
 ~~~~~~~~~
-error:4:
+error:4:0:PHP2:Fatal Error
diff --git a/src/lint/linter/__tests__/php/syntax.lint-test b/src/lint/linter/__tests__/php/syntax.lint-test
index ce6809f3..279fb7af 100644
--- a/src/lint/linter/__tests__/php/syntax.lint-test
+++ b/src/lint/linter/__tests__/php/syntax.lint-test
@@ -1,7 +1,7 @@
 <?php
 
 function f() {
   this is bad syntax;
 }
 ~~~~~~~~~
-error:4:
+error:4:0:PHP1:Parse Error
diff --git a/src/lint/linter/__tests__/pyflakes/pyflakes.lint-test b/src/lint/linter/__tests__/pyflakes/pyflakes.lint-test
index 35d0afea..58765cd4 100644
--- a/src/lint/linter/__tests__/pyflakes/pyflakes.lint-test
+++ b/src/lint/linter/__tests__/pyflakes/pyflakes.lint-test
@@ -1,7 +1,7 @@
 import sys, os
 
 x += 1
 ~~~~~~~~~~
-warning:1:
-warning:1:
-error:3:
+warning:1:0
+warning:1:0
+error:3:0
diff --git a/src/lint/linter/__tests__/pylint/negativechar.lint-test b/src/lint/linter/__tests__/pylint/negativechar.lint-test
index 18b69adb..6a03f740 100644
--- a/src/lint/linter/__tests__/pylint/negativechar.lint-test
+++ b/src/lint/linter/__tests__/pylint/negativechar.lint-test
@@ -1,6 +1,6 @@
 """Docstring"""
 
 """
 Useless string """
 ~~~~~~~~~~
-warning:4:0 See T9257.
+warning:4:0:W0105:Pointless String Statement
diff --git a/src/lint/linter/__tests__/pylint/pylint.lint-test b/src/lint/linter/__tests__/pylint/pylint.lint-test
index 1bd4f202..71dda0ad 100644
--- a/src/lint/linter/__tests__/pylint/pylint.lint-test
+++ b/src/lint/linter/__tests__/pylint/pylint.lint-test
@@ -1,7 +1,9 @@
 import sys, os
 
 x += 1
 ~~~~~~~~~~
-warning:1:0
-advice:1:0
-error:3:0
+advice:1:0:C0111:Missing Docstring
+advice:1:0:C0410:Multiple Imports
+warning:1:0:W0611:Unused Import
+warning:1:0:W0611:Unused Import
+error:3:0:E0602:Undefined Variable
diff --git a/src/lint/linter/__tests__/rubocop/convention.lint-test b/src/lint/linter/__tests__/rubocop/convention.lint-test
index 6d91a080..b924ae29 100644
--- a/src/lint/linter/__tests__/rubocop/convention.lint-test
+++ b/src/lint/linter/__tests__/rubocop/convention.lint-test
@@ -1,4 +1,4 @@
 def hello()
 end
 ~~~~~~~~~~
-warning:1:10
+warning:1:10:-
diff --git a/src/lint/linter/__tests__/ruby/hello.lint-test b/src/lint/linter/__tests__/ruby/hello.lint-test
index eca7dcf1..f6693b6c 100644
--- a/src/lint/linter/__tests__/ruby/hello.lint-test
+++ b/src/lint/linter/__tests__/ruby/hello.lint-test
@@ -1,4 +1,4 @@
 def hello()
   puts "hello world"
 ~~~~~~~~~~
-error:2:
+error:2:0:RUBY:Syntax Error
diff --git a/src/lint/linter/__tests__/spelling/spell.lint-test b/src/lint/linter/__tests__/spelling/spell.lint-test
index 367ba8a5..8b2ed37c 100644
--- a/src/lint/linter/__tests__/spelling/spell.lint-test
+++ b/src/lint/linter/__tests__/spelling/spell.lint-test
@@ -1,20 +1,20 @@
 Hello
 teh
 word
 $y = $x->recieveData();
 for (i=0; i<y.lenght; i++) {
 }
 Check uFT8 ufT8 (<-- repeated)
 
 didn't remove acording
 Added ZZZZsupermnZZZZ
 Added full batmn batmnZZZZ
 ~~~~~~~~~~
-warning:2:1
-warning:4:10
-warning:5:15
-warning:7:7
-warning:7:12
-warning:9:15
-warning:10:11
-warning:11:12
+warning:2:1:SPELL1:Possible Spelling Mistake
+warning:4:10:SPELL2:Possible Spelling Mistake
+warning:5:15:SPELL2:Possible Spelling Mistake
+warning:7:7:SPELL2:Possible Spelling Mistake
+warning:7:12:SPELL2:Possible Spelling Mistake
+warning:9:15:SPELL1:Possible Spelling Mistake
+warning:10:11:SPELL2:Possible Spelling Mistake
+warning:11:12:SPELL1:Possible Spelling Mistake
diff --git a/src/lint/linter/__tests__/text/bad-charset.lint-test b/src/lint/linter/__tests__/text/bad-charset.lint-test
index 9cf661c7..68d30db5 100644
--- a/src/lint/linter/__tests__/text/bad-charset.lint-test
+++ b/src/lint/linter/__tests__/text/bad-charset.lint-test
@@ -1,3 +1,3 @@
 ❤♎☀★☂♞
 ~~~~~~~~~~
-error:1:1
+error:1:1:TXT5:Bad Charset
diff --git a/src/lint/linter/__tests__/text/bof-whitespace-1.lint-test b/src/lint/linter/__tests__/text/bof-whitespace-1.lint-test
index 995aad6b..09d45e9b 100644
--- a/src/lint/linter/__tests__/text/bof-whitespace-1.lint-test
+++ b/src/lint/linter/__tests__/text/bof-whitespace-1.lint-test
@@ -1,9 +1,9 @@
 
 
 
 
 The quick brown fox jumps over the lazy dog.
 ~~~~~~~~~~
-autofix:1:1
+autofix:1:1:TXT8:Leading Whitespace at BOF
 ~~~~~~~~~~
 The quick brown fox jumps over the lazy dog.
diff --git a/src/lint/linter/__tests__/text/dos-newline.lint-test b/src/lint/linter/__tests__/text/dos-newline.lint-test
index 5ff143d0..54669dcc 100644
--- a/src/lint/linter/__tests__/text/dos-newline.lint-test
+++ b/src/lint/linter/__tests__/text/dos-newline.lint-test
@@ -1,7 +1,7 @@
 The quick brown fox
 jumps over the lazy dog.
 ~~~~~~~~~~
-error:1:1
+error:1:1:TXT1:DOS Newlines
 ~~~~~~~~~~
 The quick brown fox
 jumps over the lazy dog.
diff --git a/src/lint/linter/__tests__/text/empty.lint-test b/src/lint/linter/__tests__/text/empty.lint-test
index 546b0f1e..72fb27ca 100644
--- a/src/lint/linter/__tests__/text/empty.lint-test
+++ b/src/lint/linter/__tests__/text/empty.lint-test
@@ -1,4 +1,4 @@
 
 
 ~~~~~~~~~~
-error::
+error:0:0:TXT10:Empty File
diff --git a/src/lint/linter/__tests__/text/eof-whitespace.lint-test b/src/lint/linter/__tests__/text/eof-whitespace.lint-test
index b3b778c7..71115520 100644
--- a/src/lint/linter/__tests__/text/eof-whitespace.lint-test
+++ b/src/lint/linter/__tests__/text/eof-whitespace.lint-test
@@ -1,9 +1,9 @@
 The quick brown fox jumps over the lazy dog.
 
 
 
 
 ~~~~~~~~~~
-autofix:2:1
+autofix:2:1:TXT9:Trailing Whitespace at EOF
 ~~~~~~~~~~
 The quick brown fox jumps over the lazy dog.
diff --git a/src/lint/linter/__tests__/text/line-wrap.lint-test b/src/lint/linter/__tests__/text/line-wrap.lint-test
index f699b82e..8b2a300f 100644
--- a/src/lint/linter/__tests__/text/line-wrap.lint-test
+++ b/src/lint/linter/__tests__/text/line-wrap.lint-test
@@ -1,6 +1,6 @@
 The quick brown fox jumps over the lazy dog.
 ~~~~~~~~~~
-warning:1:1
+warning:1:1:TXT3:Line Too Long
 ~~~~~~~~~~
 ~~~~~~~~~~
 {"config": {"text.max-line-length": 40}}
diff --git a/src/lint/linter/__tests__/text/trailing-whitespace-1.lint-test b/src/lint/linter/__tests__/text/trailing-whitespace-1.lint-test
index 56637cb5..a563fd86 100644
--- a/src/lint/linter/__tests__/text/trailing-whitespace-1.lint-test
+++ b/src/lint/linter/__tests__/text/trailing-whitespace-1.lint-test
@@ -1,8 +1,8 @@
 The quick brown fox 
 jumps over the lazy dog. 
 ~~~~~~~~~~
-autofix:1:20
-autofix:2:25
+autofix:1:20:TXT6:Trailing Whitespace
+autofix:2:25:TXT6:Trailing Whitespace
 ~~~~~~~~~~
 The quick brown fox
 jumps over the lazy dog.
diff --git a/src/lint/linter/__tests__/text/trailing-whitespace-2.lint-test b/src/lint/linter/__tests__/text/trailing-whitespace-2.lint-test
index 0863c187..c8b6bc3e 100644
--- a/src/lint/linter/__tests__/text/trailing-whitespace-2.lint-test
+++ b/src/lint/linter/__tests__/text/trailing-whitespace-2.lint-test
@@ -1,15 +1,15 @@
 Lorem ipsum dolor sit amet,	
 consectetur adipiscing elit.	
 Phasellus sodales nibh erat,	
 in hendrerit nulla dictum interdum.	
 ~~~~~~~~~~
-error:1:28
-autofix:1:28
-autofix:2:29
-autofix:3:29
-autofix:4:36
+error:1:28:TXT2:Tab Literal
+autofix:1:28:TXT6:Trailing Whitespace
+autofix:2:29:TXT6:Trailing Whitespace
+autofix:3:29:TXT6:Trailing Whitespace
+autofix:4:36:TXT6:Trailing Whitespace
 ~~~~~~~~~~
 Lorem ipsum dolor sit amet,
 consectetur adipiscing elit.
 Phasellus sodales nibh erat,
 in hendrerit nulla dictum interdum.
diff --git a/src/lint/linter/__tests__/text/trailing-whitespace-3.lint-test b/src/lint/linter/__tests__/text/trailing-whitespace-3.lint-test
index e92f7bbd..d362c5e2 100644
--- a/src/lint/linter/__tests__/text/trailing-whitespace-3.lint-test
+++ b/src/lint/linter/__tests__/text/trailing-whitespace-3.lint-test
@@ -1,15 +1,15 @@
 Lorem ipsum dolor sit amet,	 	 	 	 	 	
 consectetur adipiscing elit.	      			
 Phasellus sodales nibh erat,	  	
 in hendrerit nulla dictum interdum.    		
 ~~~~~~~~~~
-error:1:28
-autofix:1:28
-autofix:2:29
-autofix:3:29
-autofix:4:36
+error:1:28:TXT2:Tab Literal
+autofix:1:28:TXT6:Trailing Whitespace
+autofix:2:29:TXT6:Trailing Whitespace
+autofix:3:29:TXT6:Trailing Whitespace
+autofix:4:36:TXT6:Trailing Whitespace
 ~~~~~~~~~~
 Lorem ipsum dolor sit amet,
 consectetur adipiscing elit.
 Phasellus sodales nibh erat,
 in hendrerit nulla dictum interdum.
diff --git a/src/lint/linter/__tests__/xhpast/embedded-tags.lint-test b/src/lint/linter/__tests__/xhpast/embedded-tags.lint-test
index 67018229..a585d44a 100644
--- a/src/lint/linter/__tests__/xhpast/embedded-tags.lint-test
+++ b/src/lint/linter/__tests__/xhpast/embedded-tags.lint-test
@@ -1,5 +1,5 @@
 <?php $x ?>
 
 This shouldn't fatal the parser.
 ~~~~~~~~~~
-disabled:2:1
+disabled:2:1:XHP78:Inline HTML
diff --git a/src/lint/linter/__tests__/xhpast/empty.lint-test b/src/lint/linter/__tests__/xhpast/empty.lint-test
index ddbbaebd..22cca1cd 100644
--- a/src/lint/linter/__tests__/xhpast/empty.lint-test
+++ b/src/lint/linter/__tests__/xhpast/empty.lint-test
@@ -1,4 +1,4 @@
 <?php
 
 ~~~~~~~~~~
-warning::
+warning:0:0:XHP82:Empty File
diff --git a/src/lint/linter/__tests__/xhpast/no-segfault-on-abstract.lint-test b/src/lint/linter/__tests__/xhpast/no-segfault-on-abstract.lint-test
index 4bcf93c6..118ce022 100644
--- a/src/lint/linter/__tests__/xhpast/no-segfault-on-abstract.lint-test
+++ b/src/lint/linter/__tests__/xhpast/no-segfault-on-abstract.lint-test
@@ -1,7 +1,7 @@
 <?php
 
 abstract class A {}
 final class F {}
 ~~~~~~~~~~
-disabled:3:1
-disabled:4:1
+disabled:3:1:XHP88:Class Not Extending `Phobject`
+disabled:4:1:XHP88:Class Not Extending `Phobject`
diff --git a/src/lint/linter/__tests__/xhpast/single-pass-adjacent-patches.lint-test b/src/lint/linter/__tests__/xhpast/single-pass-adjacent-patches.lint-test
index 0e66f3f1..9bbce64c 100644
--- a/src/lint/linter/__tests__/xhpast/single-pass-adjacent-patches.lint-test
+++ b/src/lint/linter/__tests__/xhpast/single-pass-adjacent-patches.lint-test
@@ -1,18 +1,22 @@
 <?php
 
 // This test is checking that the LintPatcher correctly applies adjacent patches
 // with large character delta effects.
 function f(                                                             ) {
   g( );
 }
 ~~~~~~~~~~
-warning:5:12
-warning:6:5
+warning:5:12:XHP38:Declaration Formatting
+warning:5:12:XHP25:Spaces Inside Parentheses
+warning:5:12:XHP25:Spaces Inside Parentheses
+warning:6:5:XHP37:Call Formatting
+warning:6:5:XHP25:Spaces Inside Parentheses
+warning:6:5:XHP25:Spaces Inside Parentheses
 ~~~~~~~~~~
 <?php
 
 // This test is checking that the LintPatcher correctly applies adjacent patches
 // with large character delta effects.
 function f() {
   g();
 }
diff --git a/src/lint/linter/__tests__/xhpast/syntax-error.lint-test b/src/lint/linter/__tests__/xhpast/syntax-error.lint-test
index 2108fdd2..7638ed05 100644
--- a/src/lint/linter/__tests__/xhpast/syntax-error.lint-test
+++ b/src/lint/linter/__tests__/xhpast/syntax-error.lint-test
@@ -1,4 +1,4 @@
 <?php
 char *buf = null;
 ~~~~~~~~~~
-error:2:1
+error:2:1:XHP1:PHP Syntax Error!
diff --git a/src/lint/linter/__tests__/xml/almost-empty.lint-test b/src/lint/linter/__tests__/xml/almost-empty.lint-test
index 0b442d19..32ad9f14 100644
--- a/src/lint/linter/__tests__/xml/almost-empty.lint-test
+++ b/src/lint/linter/__tests__/xml/almost-empty.lint-test
@@ -1,3 +1,3 @@
 <?xml version="1.0" encoding="utf-8"?>
 ~~~~~~~~~~
-error:2:1
+error:2:1:XML4:LibXML Error
diff --git a/src/lint/linter/__tests__/xml/char-ref.lint-test b/src/lint/linter/__tests__/xml/char-ref.lint-test
index a142bbe4..6f4cca9a 100644
--- a/src/lint/linter/__tests__/xml/char-ref.lint-test
+++ b/src/lint/linter/__tests__/xml/char-ref.lint-test
@@ -1,3 +1,3 @@
 <bla>&#010100000000000000000000000000000000000000000000000060;</bla>
 ~~~~~~~~~~
-error:1:63
+error:1:63:XML9:LibXML Error
diff --git a/src/lint/linter/__tests__/xml/languages-5.lint-test b/src/lint/linter/__tests__/xml/languages-5.lint-test
index cf469965..508b4f1a 100644
--- a/src/lint/linter/__tests__/xml/languages-5.lint-test
+++ b/src/lint/linter/__tests__/xml/languages-5.lint-test
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <languages>
     <>
 </languages>
 ~~~~~~~~~~
-error:3:6
+error:3:6:XML68:LibXML Error
diff --git a/src/lint/linter/__tests__/xml/languages-6.lint-test b/src/lint/linter/__tests__/xml/languages-6.lint-test
index 1cdb9519..f652fbb8 100644
--- a/src/lint/linter/__tests__/xml/languages-6.lint-test
+++ b/src/lint/linter/__tests__/xml/languages-6.lint-test
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <languages>
     </lang>
 </languages>
 ~~~~~~~~~~
-error:3:16
-error:4:1
+error:3:16:XML76:LibXML Error
+error:4:1:XML5:LibXML Error
diff --git a/src/lint/linter/xhpast/rules/__tests__/__lambda_func-function/lamba-func-function.lint-test b/src/lint/linter/xhpast/rules/__tests__/__lambda_func-function/lamba-func-function.lint-test
index 554a4034..a65ee01f 100644
--- a/src/lint/linter/xhpast/rules/__tests__/__lambda_func-function/lamba-func-function.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/__lambda_func-function/lamba-func-function.lint-test
@@ -1,5 +1,5 @@
 <?php
 
 function __lambda_func() {}
 ~~~~~~~~~~
-error:3:1
+error:3:1:XHP68:`__lambda_func` Function
diff --git a/src/lint/linter/xhpast/rules/__tests__/__toString-exception/__toString-exception.lint-test b/src/lint/linter/xhpast/rules/__tests__/__toString-exception/__toString-exception.lint-test
index 57626826..dd0c7b50 100644
--- a/src/lint/linter/xhpast/rules/__tests__/__toString-exception/__toString-exception.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/__toString-exception/__toString-exception.lint-test
@@ -1,27 +1,27 @@
 <?php
 
 class MyClass {
   public function __toString() {
     if (some_function()) {
       throw new Exception('Oops');
     }
 
     return __CLASS__;
   }
 }
 
 class MyOtherClass {
   public function __toString() {
     return 'Success';
   }
 }
 
 interface SomeInterface {
   public function __toString();
 }
 
 abstract class SomeAbstractClass {
   abstract public function __toString();
 }
 ~~~~~~~~~~
-error:6:7
+error:6:7:XHP67:Throwing Exception in `__toString` Method
diff --git a/src/lint/linter/xhpast/rules/__tests__/abstract-method-body/body.lint-test b/src/lint/linter/xhpast/rules/__tests__/abstract-method-body/body.lint-test
index 0ffc86e1..3404e1db 100644
--- a/src/lint/linter/xhpast/rules/__tests__/abstract-method-body/body.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/abstract-method-body/body.lint-test
@@ -1,6 +1,6 @@
 <?php
 abstract class SomeClass {
   abstract public function someMethod() {}
 }
 ~~~~~~~~~~
-error:3:41
+error:3:41:XHP108:`abstract` Method Cannot Contain Body
diff --git a/src/lint/linter/xhpast/rules/__tests__/abstract-private-method/abstract-private-method.lint-test b/src/lint/linter/xhpast/rules/__tests__/abstract-private-method/abstract-private-method.lint-test
index ea96208e..2586c5d1 100644
--- a/src/lint/linter/xhpast/rules/__tests__/abstract-private-method/abstract-private-method.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/abstract-private-method/abstract-private-method.lint-test
@@ -1,6 +1,6 @@
 <?php
 abstract class SomeClass {
   private abstract function someMethod();
 }
 ~~~~~~~~~~
-error:3:3
+error:3:3:XHP107:`abstract` Method Cannot Be Declared `private`
diff --git a/src/lint/linter/xhpast/rules/__tests__/alias-functions/alias-functions.lint-test b/src/lint/linter/xhpast/rules/__tests__/alias-functions/alias-functions.lint-test
index d2834524..04ca9135 100644
--- a/src/lint/linter/xhpast/rules/__tests__/alias-functions/alias-functions.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/alias-functions/alias-functions.lint-test
@@ -1,17 +1,17 @@
 <?php
 
 $x = array();
 sizeof($x);
 die();
 sizeOf($x);
 ~~~~~~~~~~
-advice:4:1
-advice:5:1
-advice:6:1
+advice:4:1:XHP65:Alias Functions
+advice:5:1:XHP65:Alias Functions
+advice:6:1:XHP65:Alias Functions
 ~~~~~~~~~~
 <?php
 
 $x = array();
 count($x);
 exit();
 count($x);
diff --git a/src/lint/linter/xhpast/rules/__tests__/array-combine/array-combine.lint-test b/src/lint/linter/xhpast/rules/__tests__/array-combine/array-combine.lint-test
index abcaac70..67d6076f 100644
--- a/src/lint/linter/xhpast/rules/__tests__/array-combine/array-combine.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/array-combine/array-combine.lint-test
@@ -1,6 +1,6 @@
 <?php
 
 array_combine($x, $x);
 array_combine($x, $y);
 ~~~~~~~~~~
-disabled:3:1
+disabled:3:1:XHP84:`array_combine()` Unreliable
diff --git a/src/lint/linter/xhpast/rules/__tests__/array-index-spacing/array-index-spacing.lint-test b/src/lint/linter/xhpast/rules/__tests__/array-index-spacing/array-index-spacing.lint-test
index 7e6f7c80..12ec107f 100644
--- a/src/lint/linter/xhpast/rules/__tests__/array-index-spacing/array-index-spacing.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/array-index-spacing/array-index-spacing.lint-test
@@ -1,16 +1,16 @@
 <?php
 
 $a []= 1;
 $a[] = 1;
 $a[]=1;
 $a [] = 1;
 ~~~~~~~~~~
-warning:3:3
-warning:6:3
+warning:3:3:XHP28:Spacing Before Array Index
+warning:6:3:XHP28:Spacing Before Array Index
 ~~~~~~~~~~
 <?php
 
 $a[]= 1;
 $a[] = 1;
 $a[]=1;
 $a[] = 1;
diff --git a/src/lint/linter/xhpast/rules/__tests__/array-separator/array-separator.lint-test b/src/lint/linter/xhpast/rules/__tests__/array-separator/array-separator.lint-test
index 51128f2e..492d35ac 100644
--- a/src/lint/linter/xhpast/rules/__tests__/array-separator/array-separator.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/array-separator/array-separator.lint-test
@@ -1,81 +1,81 @@
 <?php
 
 array(1, 2, 3);
 array(1, 2, 3,);
 array(
   1,
   2,
   3,
 );
 array(
   1,
   2,
   3 // comment
 );
 array(
   'foo',
   array('foo')
 );
 array(
   'foo' => <<<EOTEXT
 This is some heredoc text.
 EOTEXT
 );
 array(
   1,
   2,
   3);
 array(
   1,
   2,
   3 /* comment */ );
 array(
   1,
   2,
   3, /* comment */ );
 ~~~~~~~~~~
-advice:4:14
-advice:13:3
-advice:17:3
-advice:27:3
-advice:31:3
-advice:35:20
+advice:4:14:XHP48:Array Separator
+advice:13:3:XHP48:Array Separator
+advice:17:3:XHP48:Array Separator
+advice:27:3:XHP48:Array Separator
+advice:31:3:XHP48:Array Separator
+advice:35:20:XHP48:Array Separator
 ~~~~~~~~~~
 <?php
 
 array(1, 2, 3);
 array(1, 2, 3);
 array(
   1,
   2,
   3,
 );
 array(
   1,
   2,
   3, // comment
 );
 array(
   'foo',
   array('foo'),
 );
 array(
   'foo' => <<<EOTEXT
 This is some heredoc text.
 EOTEXT
 );
 array(
   1,
   2,
   3,
 );
 array(
   1,
   2,
   3, /* comment */ 
 );
 array(
   1,
   2,
   3, /* comment */ 
 );
diff --git a/src/lint/linter/xhpast/rules/__tests__/array-value/array-value.lint-test b/src/lint/linter/xhpast/rules/__tests__/array-value/array-value.lint-test
index 9ab10ad7..795a4de0 100644
--- a/src/lint/linter/xhpast/rules/__tests__/array-value/array-value.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/array-value/array-value.lint-test
@@ -1,56 +1,56 @@
 <?php
 
 array(
   1, 2, 3,
 );
 
 array(
   'foo' => 'bar', 'bar' => 'baz',
 );
 
 array(
   1, /* quack */ 2, /* quack */3,
 );
 
 array(
   /* OPEN   */ 1,
   /* CLOSED */ 2,
 );
 
 array('quack',
 );
 ~~~~~~~~~~
-warning:4:5
-warning:4:8
-warning:8:18
-warning:12:17
-warning:12:32
-warning:20:7
+warning:4:5:XHP76:Array Element
+warning:4:8:XHP76:Array Element
+warning:8:18:XHP76:Array Element
+warning:12:17:XHP76:Array Element
+warning:12:32:XHP76:Array Element
+warning:20:7:XHP76:Array Element
 ~~~~~~~~~~
 <?php
 
 array(
   1,
   2,
   3,
 );
 
 array(
   'foo' => 'bar',
   'bar' => 'baz',
 );
 
 array(
   1, /* quack */
   2, /* quack */
   3,
 );
 
 array(
   /* OPEN   */ 1,
   /* CLOSED */ 2,
 );
 
 array(
 'quack',
 );
diff --git a/src/lint/linter/xhpast/rules/__tests__/binary-expression-spacing/array.lint-test b/src/lint/linter/xhpast/rules/__tests__/binary-expression-spacing/array.lint-test
index 8e0857c9..46fc5b8a 100644
--- a/src/lint/linter/xhpast/rules/__tests__/binary-expression-spacing/array.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/binary-expression-spacing/array.lint-test
@@ -1,40 +1,40 @@
 <?php
 
 array($x => $y);
 array($x=>$y);
 array($x =>$y);
 array($x=> $y);
 
 array(
   $x => $y,
 );
 array(
   $x =>
     $y,
 );
 array(
   $x=>$y,
 );
 ~~~~~~~~~~
-warning:4:9
-warning:5:10
-warning:6:9
-warning:16:5
+warning:4:9:XHP27:Space Around Binary Operator
+warning:5:10:XHP27:Space Around Binary Operator
+warning:6:9:XHP27:Space Around Binary Operator
+warning:16:5:XHP27:Space Around Binary Operator
 ~~~~~~~~~~
 <?php
 
 array($x => $y);
 array($x => $y);
 array($x => $y);
 array($x => $y);
 
 array(
   $x => $y,
 );
 array(
   $x =>
     $y,
 );
 array(
   $x => $y,
 );
diff --git a/src/lint/linter/xhpast/rules/__tests__/binary-expression-spacing/binary-expression-spacing.lint-test b/src/lint/linter/xhpast/rules/__tests__/binary-expression-spacing/binary-expression-spacing.lint-test
index 571a5648..3caaab1c 100644
--- a/src/lint/linter/xhpast/rules/__tests__/binary-expression-spacing/binary-expression-spacing.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/binary-expression-spacing/binary-expression-spacing.lint-test
@@ -1,65 +1,65 @@
 <?php
 
 $a + $b;
 $a+$b;
 $a +$b;
 $a+ $b;
 $a = -$b;
 $a=-$b;
 $a-=$b;
 $a -=$b;
 $a-= $b;
 $a===$b;
 $a.$b;
 function x($n=null) {}
 function x($n = null) {}
 
 $y /* ! */ += // ?
 $z;
 $obj->method();
 Dog::bark();
 $prev = ($total == 1) ? $navids[0] : $navids[$total-1];
 $next = ($total == 1) ? $navids[0] : $navids[$current+1];
 if ($x instanceof z &&$w) {}
 if ($x instanceof z && $w) {}
 f(1,2);
 ~~~~~~~~~~
-warning:4:3
-warning:5:4
-warning:6:3
-warning:8:3
-warning:9:3
-warning:10:4
-warning:11:3
-warning:12:3
-warning:14:14
-warning:21:52
-warning:22:54
-warning:23:21
-warning:25:4
+warning:4:3:XHP27:Space Around Binary Operator
+warning:5:4:XHP27:Space Around Binary Operator
+warning:6:3:XHP27:Space Around Binary Operator
+warning:8:3:XHP27:Space Around Binary Operator
+warning:9:3:XHP27:Space Around Binary Operator
+warning:10:4:XHP27:Space Around Binary Operator
+warning:11:3:XHP27:Space Around Binary Operator
+warning:12:3:XHP27:Space Around Binary Operator
+warning:14:14:XHP27:Space Around Binary Operator
+warning:21:52:XHP27:Space Around Binary Operator
+warning:22:54:XHP27:Space Around Binary Operator
+warning:23:21:XHP27:Space Around Binary Operator
+warning:25:4:XHP27:Space Around Binary Operator
 ~~~~~~~~~~
 <?php
 
 $a + $b;
 $a + $b;
 $a + $b;
 $a + $b;
 $a = -$b;
 $a = -$b;
 $a -= $b;
 $a -= $b;
 $a -= $b;
 $a === $b;
 $a.$b;
 function x($n = null) {}
 function x($n = null) {}
 
 $y /* ! */ += // ?
 $z;
 $obj->method();
 Dog::bark();
 $prev = ($total == 1) ? $navids[0] : $navids[$total - 1];
 $next = ($total == 1) ? $navids[0] : $navids[$current + 1];
 if ($x instanceof z && $w) {}
 if ($x instanceof z && $w) {}
 f(1, 2);
diff --git a/src/lint/linter/xhpast/rules/__tests__/binary-numeric-scalar-casing/binary.lint-test b/src/lint/linter/xhpast/rules/__tests__/binary-numeric-scalar-casing/binary.lint-test
index 406fe97c..8297e01f 100644
--- a/src/lint/linter/xhpast/rules/__tests__/binary-numeric-scalar-casing/binary.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/binary-numeric-scalar-casing/binary.lint-test
@@ -1,5 +1,5 @@
 <?php
 0b1;
 0B1;
 ~~~~~~~~~~
-warning:3:1
+warning:3:1:XHP131:Binary Integer Casing
diff --git a/src/lint/linter/xhpast/rules/__tests__/blacklisted-function/blacklisted-function.lint-test b/src/lint/linter/xhpast/rules/__tests__/blacklisted-function/blacklisted-function.lint-test
index b727afc4..1a2df109 100644
--- a/src/lint/linter/xhpast/rules/__tests__/blacklisted-function/blacklisted-function.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/blacklisted-function/blacklisted-function.lint-test
@@ -1,14 +1,14 @@
 <?php
 
 eval('evil code');
 ~~~~~~~~~~
-error:3:1
+error:3:1:XHP51:Use of Blacklisted Function
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.blacklisted.function": {
       "eval": "Evil function"
     }
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/brace-formatting/class.lint-test b/src/lint/linter/xhpast/rules/__tests__/brace-formatting/class.lint-test
index 37c94ec9..b7d72894 100644
--- a/src/lint/linter/xhpast/rules/__tests__/brace-formatting/class.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/brace-formatting/class.lint-test
@@ -1,14 +1,14 @@
 <?php
 
 class SomeClass {}
 class SomeOtherClass{}
 class YetAnotherClass extends SomeClass{}
 ~~~~~~~~~~
-warning:4:21
-warning:5:40
+warning:4:21:XHP24:Brace Placement
+warning:5:40:XHP24:Brace Placement
 ~~~~~~~~~~
 <?php
 
 class SomeClass {}
 class SomeOtherClass {}
 class YetAnotherClass extends SomeClass {}
diff --git a/src/lint/linter/xhpast/rules/__tests__/brace-formatting/control-statement.lint-test b/src/lint/linter/xhpast/rules/__tests__/brace-formatting/control-statement.lint-test
index 2454529e..a7c9a5b1 100644
--- a/src/lint/linter/xhpast/rules/__tests__/brace-formatting/control-statement.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/brace-formatting/control-statement.lint-test
@@ -1,53 +1,53 @@
 <?php
 
 if (1)
 {}
 
 foreach (x() as $y)
 {}
 
 while (1)
 {}
 
 switch (1)
 {}
 
 if ($x) foo();
 else bar();
 do baz(); while ($x);
 
 if ($x) {}
 else if ($y) {}
 else {}
 
 if ($x) {}else{}
 ~~~~~~~~~~
-warning:3:7
-warning:6:20
-warning:9:10
-warning:12:11
-warning:15:9
-warning:16:6
-warning:17:4
-warning:19:11
-warning:20:16
-warning:23:11
-warning:23:15
+warning:3:7:XHP24:Brace Placement
+warning:6:20:XHP24:Brace Placement
+warning:9:10:XHP24:Brace Placement
+warning:12:11:XHP24:Brace Placement
+warning:15:9:XHP24:Brace Placement
+warning:16:6:XHP24:Brace Placement
+warning:17:4:XHP24:Brace Placement
+warning:19:11:XHP24:Brace Placement
+warning:20:16:XHP24:Brace Placement
+warning:23:11:XHP24:Brace Placement
+warning:23:15:XHP24:Brace Placement
 ~~~~~~~~~~
 <?php
 
 if (1) {}
 
 foreach (x() as $y) {}
 
 while (1) {}
 
 switch (1) {}
 
 if ($x) foo();
 else bar();
 do baz(); while ($x);
 
 if ($x) {} else if ($y) {} else {}
 
 if ($x) {} else {}
diff --git a/src/lint/linter/xhpast/rules/__tests__/brace-formatting/function.lint-test b/src/lint/linter/xhpast/rules/__tests__/brace-formatting/function.lint-test
index 46ee8076..ff182cf7 100644
--- a/src/lint/linter/xhpast/rules/__tests__/brace-formatting/function.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/brace-formatting/function.lint-test
@@ -1,27 +1,27 @@
 <?php
 
 function f() {
 
 }
 
 function g()
 {
 
 }
 
 function h(){}
 ~~~~~~~~~~
-warning:7:13
-warning:12:13
+warning:7:13:XHP24:Brace Placement
+warning:12:13:XHP24:Brace Placement
 ~~~~~~~~~~
 <?php
 
 function f() {
 
 }
 
 function g() {
 
 }
 
 function h() {}
diff --git a/src/lint/linter/xhpast/rules/__tests__/brace-formatting/try-catch.lint-test b/src/lint/linter/xhpast/rules/__tests__/brace-formatting/try-catch.lint-test
index 7b3f1494..fe667ca2 100644
--- a/src/lint/linter/xhpast/rules/__tests__/brace-formatting/try-catch.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/brace-formatting/try-catch.lint-test
@@ -1,14 +1,14 @@
 <?php
 
 try
 {}
 catch (Exception $x)
 {}
 ~~~~~~~~~~
-warning:3:4
-warning:5:21
+warning:3:4:XHP24:Brace Placement
+warning:5:21:XHP24:Brace Placement
 ~~~~~~~~~~
 <?php
 
 try {}
 catch (Exception $x) {}
diff --git a/src/lint/linter/xhpast/rules/__tests__/call-parentheses/array.lint-test b/src/lint/linter/xhpast/rules/__tests__/call-parentheses/array.lint-test
index b50f6a1c..aef56540 100644
--- a/src/lint/linter/xhpast/rules/__tests__/call-parentheses/array.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/call-parentheses/array.lint-test
@@ -1,15 +1,15 @@
 <?php
 
 array ( 1, 2, 3 );
 list ( $x, $y ) = array();
 [ 1, 2 , 3 ];
 ~~~~~~~~~~
-warning:3:6
-warning:4:5
-warning:4:14
+warning:3:6:XHP37:Call Formatting
+warning:4:5:XHP37:Call Formatting
+warning:4:14:XHP37:Call Formatting
 ~~~~~~~~~~
 <?php
 
 array( 1, 2, 3 );
 list( $x, $y) = array();
 [ 1, 2 , 3 ];
diff --git a/src/lint/linter/xhpast/rules/__tests__/call-parentheses/call-parentheses.lint-test b/src/lint/linter/xhpast/rules/__tests__/call-parentheses/call-parentheses.lint-test
index 3ec2eaa5..b1cef83c 100644
--- a/src/lint/linter/xhpast/rules/__tests__/call-parentheses/call-parentheses.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/call-parentheses/call-parentheses.lint-test
@@ -1,42 +1,42 @@
 <?php
 
 f(1);
 f(1 );
 f(1 /* oh */ );
 f(
   1);
 f(
   1
 );
 array(
   1,
 );
 f(<<<EODOC
 The duck says, "Quack!"
 The robot says, "Beep beep boop boop!"
 EODOC
   );
 f (1);
 ~~~~~~~~~~
-warning:4:4
-warning:9:4
-warning:19:2
+warning:4:4:XHP37:Call Formatting
+warning:9:4:XHP37:Call Formatting
+warning:19:2:XHP37:Call Formatting
 ~~~~~~~~~~
 <?php
 
 f(1);
 f(1);
 f(1 /* oh */ );
 f(
   1);
 f(
   1);
 array(
   1,
 );
 f(<<<EODOC
 The duck says, "Quack!"
 The robot says, "Beep beep boop boop!"
 EODOC
   );
 f(1);
diff --git a/src/lint/linter/xhpast/rules/__tests__/call-time-pass-by-reference/call-time-pass-by-reference.lint-test b/src/lint/linter/xhpast/rules/__tests__/call-time-pass-by-reference/call-time-pass-by-reference.lint-test
index 9f5c9c9a..61135acb 100644
--- a/src/lint/linter/xhpast/rules/__tests__/call-time-pass-by-reference/call-time-pass-by-reference.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/call-time-pass-by-reference/call-time-pass-by-reference.lint-test
@@ -1,33 +1,33 @@
 <?php
 
 class MyClass {
   public function myfunc($var) {
     echo $var;
   }
 }
 
 $myvar = true;
 myfunc(&$myvar);
 myfunc($myvar);
 
 $this->myfunc(&$myvar);
 $this->myfunc($myvar);
 
 MyClass::myfunc(&$myvar);
 MyClass::myfunc($myvar);
 
 while (testfunc($var1, &$var2, $var3, &$var4) === false) {}
 
 sprintf('0%o', 0777 & $p);
 
 $foo(&$myvar);
 
 array_walk(array(), function () use (&$x) {});
 MyClass::myfunc(array(&$x, &$y));
 ~~~~~~~~~~
-error:10:8
-error:13:15
-error:16:17
-error:19:24
-error:19:39
-error:23:6
+error:10:8:XHP53:Call-Time Pass-By-Reference
+error:13:15:XHP53:Call-Time Pass-By-Reference
+error:16:17:XHP53:Call-Time Pass-By-Reference
+error:19:24:XHP53:Call-Time Pass-By-Reference
+error:19:39:XHP53:Call-Time Pass-By-Reference
+error:23:6:XHP53:Call-Time Pass-By-Reference
diff --git a/src/lint/linter/xhpast/rules/__tests__/cast-spacing/cast-spacing.lint-test b/src/lint/linter/xhpast/rules/__tests__/cast-spacing/cast-spacing.lint-test
index bc70f302..0662c526 100644
--- a/src/lint/linter/xhpast/rules/__tests__/cast-spacing/cast-spacing.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/cast-spacing/cast-spacing.lint-test
@@ -1,14 +1,14 @@
 <?php
 
 echo (double)0;
 echo (int) 1;
 echo (string)  2;
 ~~~~~~~~~~
-advice:4:11
-advice:5:14
+advice:4:11:XHP66:Cast Spacing
+advice:5:14:XHP66:Cast Spacing
 ~~~~~~~~~~
 <?php
 
 echo (double)0;
 echo (int)1;
 echo (string)2;
diff --git a/src/lint/linter/xhpast/rules/__tests__/class-extends-object/extends-phobject.lint-test b/src/lint/linter/xhpast/rules/__tests__/class-extends-object/extends-phobject.lint-test
index 3856360f..89ce11a8 100644
--- a/src/lint/linter/xhpast/rules/__tests__/class-extends-object/extends-phobject.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/class-extends-object/extends-phobject.lint-test
@@ -1,7 +1,7 @@
 <?php
 
 abstract class A extends Phobject {}
 final class B extends A {}
 final class C {}
 ~~~~~~~~~~
-disabled:5:1
+disabled:5:1:XHP88:Class Not Extending `Phobject`
diff --git a/src/lint/linter/xhpast/rules/__tests__/class-must-be-declared-abstract/should-be-abstract.lint-test b/src/lint/linter/xhpast/rules/__tests__/class-must-be-declared-abstract/should-be-abstract.lint-test
index 90861196..4d58000a 100644
--- a/src/lint/linter/xhpast/rules/__tests__/class-must-be-declared-abstract/should-be-abstract.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/class-must-be-declared-abstract/should-be-abstract.lint-test
@@ -1,6 +1,6 @@
 <?php
 class SomeClass {
   abstract public function someMethod();
 }
 ~~~~~~~~~~
-error:2:1
+error:2:1:XHP113:`class` Containing `abstract` Methods Must Be Declared `abstract`
diff --git a/src/lint/linter/xhpast/rules/__tests__/class-name-literal/class-name-literal.lint-test b/src/lint/linter/xhpast/rules/__tests__/class-name-literal/class-name-literal.lint-test
index 263fa6bc..66bd140b 100644
--- a/src/lint/linter/xhpast/rules/__tests__/class-name-literal/class-name-literal.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/class-name-literal/class-name-literal.lint-test
@@ -1,42 +1,42 @@
 <?php
 
 class MyClass {
   public function someMethod() {
     return 'MyClass';
   }
 
   public function someOtherMethod() {
     $x = 'MyClass is awesome';
     $y = 'MyClassIsAwesome';
     return __CLASS__;
   }
 }
 
 $c = new class {
   public function someMethod() {
     return __CLASS__;
   }
 };
 ~~~~~~~~~~
-advice:5:12
-advice:9:10
+advice:5:12:XHP62:Class Name Literal
+advice:9:10:XHP62:Class Name Literal
 ~~~~~~~~~~
 <?php
 
 class MyClass {
   public function someMethod() {
     return __CLASS__;
   }
 
   public function someOtherMethod() {
     $x = 'MyClass is awesome';
     $y = 'MyClassIsAwesome';
     return __CLASS__;
   }
 }
 
 $c = new class {
   public function someMethod() {
     return __CLASS__;
   }
 };
diff --git a/src/lint/linter/xhpast/rules/__tests__/comment-style/hash-comments.lint-test b/src/lint/linter/xhpast/rules/__tests__/comment-style/hash-comments.lint-test
index 636e36bc..c1294333 100644
--- a/src/lint/linter/xhpast/rules/__tests__/comment-style/hash-comments.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/comment-style/hash-comments.lint-test
@@ -1,51 +1,51 @@
 <?php
 
 # no
 #no
 // yes
 # no
 /* yes */ #no
 /*
  * yes
  */
 /**
  * yes
  */
 //#yes
 /*#yes*/
 #
 //
 /////////////////// yes
 /*no */
 /**no */
 /** yes */
 /**** yes ****/
 ~~~~~~~~~~
-error:3:1
-error:4:1
-error:6:1
-error:7:11
-error:16:1
+error:3:1:XHP18:Comment Style
+error:4:1:XHP18:Comment Style
+error:6:1:XHP18:Comment Style
+error:7:11:XHP18:Comment Style
+error:16:1:XHP18:Comment Style
 ~~~~~~~~~~
 <?php
 
 // no
 // no
 // yes
 // no
 /* yes */ // no
 /*
  * yes
  */
 /**
  * yes
  */
 //#yes
 /*#yes*/
 //
 //
 /////////////////// yes
 /*no */
 /**no */
 /** yes */
 /**** yes ****/
diff --git a/src/lint/linter/xhpast/rules/__tests__/concatenation-operator/concatenation-operator.lint-test b/src/lint/linter/xhpast/rules/__tests__/concatenation-operator/concatenation-operator.lint-test
index c2530902..9e0fbce4 100644
--- a/src/lint/linter/xhpast/rules/__tests__/concatenation-operator/concatenation-operator.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/concatenation-operator/concatenation-operator.lint-test
@@ -1,26 +1,26 @@
 <?php
 
 $a.$b;
 $a . $b;
 $a. $b;
 $a .$b;
 $a.
 $b;
 $a.   // This should be okay.
 $b;
 ~~~~~~~~~~
-warning:4:3
-warning:4:5
-warning:5:4
-warning:6:3
+warning:4:3:XHP44:Concatenation Spacing
+warning:4:5:XHP44:Concatenation Spacing
+warning:5:4:XHP44:Concatenation Spacing
+warning:6:3:XHP44:Concatenation Spacing
 ~~~~~~~~~~
 <?php
 
 $a.$b;
 $a.$b;
 $a.$b;
 $a.$b;
 $a.
 $b;
 $a.   // This should be okay.
 $b;
diff --git a/src/lint/linter/xhpast/rules/__tests__/constructor-parentheses/constructor-parentheses.lint-test b/src/lint/linter/xhpast/rules/__tests__/constructor-parentheses/constructor-parentheses.lint-test
index 5bfa198d..d4cad182 100644
--- a/src/lint/linter/xhpast/rules/__tests__/constructor-parentheses/constructor-parentheses.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/constructor-parentheses/constructor-parentheses.lint-test
@@ -1,16 +1,16 @@
 <?php
 
 new Foo;
 new Bar();
 new Foo\Bar;
 new class {};
 ~~~~~~~~~~
-advice:3:5
-advice:5:5
+advice:3:5:XHP49:Constructor Parentheses
+advice:5:5:XHP49:Constructor Parentheses
 ~~~~~~~~~~
 <?php
 
 new Foo();
 new Bar();
 new Foo\Bar();
 new class {};
diff --git a/src/lint/linter/xhpast/rules/__tests__/continue-inside-switch/continue-inside-switch-1-valid.lint-test b/src/lint/linter/xhpast/rules/__tests__/continue-inside-switch/continue-inside-switch-1-valid.lint-test
index 6a9f040f..7a280f1d 100644
--- a/src/lint/linter/xhpast/rules/__tests__/continue-inside-switch/continue-inside-switch-1-valid.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/continue-inside-switch/continue-inside-switch-1-valid.lint-test
@@ -1,21 +1,20 @@
 <?php
 
 // These are valid loops which you can "continue;" inside.
 
 for ($x = 0; $x < 3; $x++) {
   continue;
 }
 
 foreach ($x as $y) {
   continue;
 }
 
 while ($x) {
   continue;
 }
 
 do {
   continue;
 } while ($x);
 ~~~~~~~~~~
-~~~~~~~~~~
diff --git a/src/lint/linter/xhpast/rules/__tests__/continue-inside-switch/continue-inside-switch-2-n.lint-test b/src/lint/linter/xhpast/rules/__tests__/continue-inside-switch/continue-inside-switch-2-n.lint-test
index 30647fa6..5a71ab7b 100644
--- a/src/lint/linter/xhpast/rules/__tests__/continue-inside-switch/continue-inside-switch-2-n.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/continue-inside-switch/continue-inside-switch-2-n.lint-test
@@ -1,24 +1,23 @@
 <?php
 
 // It's okay to "continue N;" into a loop, although this is usually not the
 // cleanest way to write code and might be discouraged in the future.
 
 while ($x) {
   switch ($y) {
     case 1:
       continue 2;
   }
 }
 
 // This is invalid, but we don't detect it for now.
 
 switch ($x) {
   case 1:
     switch ($y) {
       case 2:
         continue 2;
     }
     break;
 }
 ~~~~~~~~~~
-~~~~~~~~~~
diff --git a/src/lint/linter/xhpast/rules/__tests__/continue-inside-switch/continue-inside-switch-3-rewrite.lint-test b/src/lint/linter/xhpast/rules/__tests__/continue-inside-switch/continue-inside-switch-3-rewrite.lint-test
index 1f86a8e2..5296303d 100644
--- a/src/lint/linter/xhpast/rules/__tests__/continue-inside-switch/continue-inside-switch-3-rewrite.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/continue-inside-switch/continue-inside-switch-3-rewrite.lint-test
@@ -1,26 +1,26 @@
 <?php
 
 switch ($x) {
   case 1:
     continue;
 }
 
 switch ($x) {
   case 1:
     continue /* CRITICAL: Nuclear launch code is 1234. */ ;
 }
 ~~~~~~~~~~
-error:5:5
-error:10:5
+error:5:5:XHP128:Continue Inside Switch
+error:10:5:XHP128:Continue Inside Switch
 ~~~~~~~~~~
 <?php
 
 switch ($x) {
   case 1:
     break;
 }
 
 switch ($x) {
   case 1:
     break /* CRITICAL: Nuclear launch code is 1234. */ ;
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/control-statement-spacing/control-statement-spacing.lint-test b/src/lint/linter/xhpast/rules/__tests__/control-statement-spacing/control-statement-spacing.lint-test
index 0c4a6e5d..6a533f57 100644
--- a/src/lint/linter/xhpast/rules/__tests__/control-statement-spacing/control-statement-spacing.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/control-statement-spacing/control-statement-spacing.lint-test
@@ -1,66 +1,66 @@
 <?php
 
 if($x) {}
 else{}
 for(;;) {}
 foreach($x as $y) {}
 while($x) {}
 do{} while($x);
 switch($x) {}
 if ($x) {}
 else if ($y) {}
 else if ($z) {}
 
 if  ($x) {}
 if
 
 ($x) {}
 if ($x) {
   echo 100;
 } else {
   echo 10;
 }
 do {
   echo 1;
 } while(true);
 
 try {} catch(Exception $ex) {}
 ~~~~~~~~~~
-warning:3:1
-warning:4:1
-warning:5:1
-warning:6:1
-warning:7:1
-warning:8:1
-warning:8:6
-warning:9:1
-warning:14:3
-warning:15:3
-warning:25:3
-warning:27:8
+warning:3:1:XHP26:Space After Control Statement
+warning:4:1:XHP26:Space After Control Statement
+warning:5:1:XHP26:Space After Control Statement
+warning:6:1:XHP26:Space After Control Statement
+warning:7:1:XHP26:Space After Control Statement
+warning:8:1:XHP26:Space After Control Statement
+warning:8:6:XHP26:Space After Control Statement
+warning:9:1:XHP26:Space After Control Statement
+warning:14:3:XHP26:Space After Control Statement
+warning:15:3:XHP26:Space After Control Statement
+warning:25:3:XHP26:Space After Control Statement
+warning:27:8:XHP26:Space After Control Statement
 ~~~~~~~~~~
 <?php
 
 if ($x) {}
 else {}
 for (;;) {}
 foreach ($x as $y) {}
 while ($x) {}
 do {} while ($x);
 switch ($x) {}
 if ($x) {}
 else if ($y) {}
 else if ($z) {}
 
 if ($x) {}
 if ($x) {}
 if ($x) {
   echo 100;
 } else {
   echo 10;
 }
 do {
   echo 1;
 } while (true);
 
 try {} catch (Exception $ex) {}
diff --git a/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/array.lint-test b/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/array.lint-test
index 0d2ec94d..44ee3b64 100644
--- a/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/array.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/array.lint-test
@@ -1,9 +1,9 @@
 <?php
 $x['key'];
 $y{'key'};
 ~~~~~~~~~~
-warning:3:1
+warning:3:1:XHP119:Curly Brace Array Index
 ~~~~~~~~~~
 <?php
 $x['key'];
 $y['key'];
diff --git a/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/nested.lint-test b/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/nested.lint-test
index 7f56597f..b4d35d79 100644
--- a/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/nested.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/nested.lint-test
@@ -1,7 +1,7 @@
 <?php
 $x[$y{'key'}];
 ~~~~~~~~~~
-warning:2:4
+warning:2:4:XHP119:Curly Brace Array Index
 ~~~~~~~~~~
 <?php
 $x[$y['key']];
diff --git a/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/whitespace.lint-test b/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/whitespace.lint-test
index a078e314..50a25e61 100644
--- a/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/whitespace.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/curly-brace-array-index/whitespace.lint-test
@@ -1,7 +1,7 @@
 <?php
 $x { 'key' /* comment */ };
 ~~~~~~~~~~
-warning:2:1
+warning:2:1:XHP119:Curly Brace Array Index
 ~~~~~~~~~~
 <?php
 $x [ 'key' /* comment */ ];
diff --git a/src/lint/linter/xhpast/rules/__tests__/declaration-parentheses/declaration-parentheses.lint-test b/src/lint/linter/xhpast/rules/__tests__/declaration-parentheses/declaration-parentheses.lint-test
index df520a44..57b96c96 100644
--- a/src/lint/linter/xhpast/rules/__tests__/declaration-parentheses/declaration-parentheses.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/declaration-parentheses/declaration-parentheses.lint-test
@@ -1,64 +1,64 @@
 <?php
 
 function f($x) {}
 function g($x ) {}
 function h ($x) {}
 
 function &i($x) {}
 function &j($x ) {}
 
 final class X {
 
   public function a($x) {}
   public function b($x ) {}
 
   public static function &c($x) {}
   public static function &d($x ) {}
 
   abstract private function e($x);
   abstract private function f($x );
 
 }
 
 f(function ($x) {});
 f(function ($x ) {});
 f(function ($x ) use ($z) {});
 f(function ($x)use($z) {});
 ~~~~~~~~~~
-warning:4:14
-warning:5:11
-warning:8:15
-warning:13:23
-warning:16:31
-warning:19:33
-warning:24:15
-warning:25:15
-warning:26:16
-warning:26:19
+warning:4:14:XHP38:Declaration Formatting
+warning:5:11:XHP38:Declaration Formatting
+warning:8:15:XHP38:Declaration Formatting
+warning:13:23:XHP38:Declaration Formatting
+warning:16:31:XHP38:Declaration Formatting
+warning:19:33:XHP38:Declaration Formatting
+warning:24:15:XHP38:Declaration Formatting
+warning:25:15:XHP38:Declaration Formatting
+warning:26:16:XHP38:Declaration Formatting
+warning:26:19:XHP38:Declaration Formatting
 ~~~~~~~~~~
 <?php
 
 function f($x) {}
 function g($x) {}
 function h($x) {}
 
 function &i($x) {}
 function &j($x) {}
 
 final class X {
 
   public function a($x) {}
   public function b($x) {}
 
   public static function &c($x) {}
   public static function &d($x) {}
 
   abstract private function e($x);
   abstract private function f($x);
 
 }
 
 f(function ($x) {});
 f(function ($x) {});
 f(function ($x) use ($z) {});
 f(function ($x) use ($z) {});
diff --git a/src/lint/linter/xhpast/rules/__tests__/default-parameters/default-parameters.lint-test b/src/lint/linter/xhpast/rules/__tests__/default-parameters/default-parameters.lint-test
index faeb7466..4a9ec06f 100644
--- a/src/lint/linter/xhpast/rules/__tests__/default-parameters/default-parameters.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/default-parameters/default-parameters.lint-test
@@ -1,12 +1,12 @@
 <?php
 
 function foo($x, $y, $z) {}
 function bar($x, $y = null, $z) {}
 function baz($x = null, $y = null, $z = null) {}
 
 class MyClass {
   public function myMethod($x, $y = null, $z) {}
 }
 ~~~~~~~~~~
-warning:4:13
-warning:8:27
+warning:4:13:XHP60:Default Parameters
+warning:8:27:XHP60:Default Parameters
diff --git a/src/lint/linter/xhpast/rules/__tests__/deprecation/deprecated-function.lint-test b/src/lint/linter/xhpast/rules/__tests__/deprecation/deprecated-function.lint-test
index bd0133ad..fdd718ad 100644
--- a/src/lint/linter/xhpast/rules/__tests__/deprecation/deprecated-function.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/deprecation/deprecated-function.lint-test
@@ -1,15 +1,15 @@
 <?php
 
 deprecated_function();
 modern_function();
 ~~~~~~~~~~
-warning:3:1
+warning:3:1:XHP85:Use of Deprecated Function
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.deprecated.functions": {
       "deprecated_function": "This function is deprecated."
     }
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/double-quote/double-quote.lint-test b/src/lint/linter/xhpast/rules/__tests__/double-quote/double-quote.lint-test
index 4559b32f..5b8aea42 100644
--- a/src/lint/linter/xhpast/rules/__tests__/double-quote/double-quote.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/double-quote/double-quote.lint-test
@@ -1,31 +1,31 @@
 <?php
 
 'foobar';
 "foo\"bar";
 "foobar\n";
 "'foobar'";
 "foo{$bar}";
 'foo"bar"';
 pht(
   "This string requires \x12\x34 double quotes, but ".
   "this string does not. Here, they are used for consistency.");
 pht(
   "This string also requires \123\345 double quotes, but ".
   "this string does not. Here, they are used for consistency.");
 ~~~~~~~~~~
-advice:4:1
+advice:4:1:XHP41:Unnecessary Double Quotes
 ~~~~~~~~~~
 <?php
 
 'foobar';
 'foo"bar';
 "foobar\n";
 "'foobar'";
 "foo{$bar}";
 'foo"bar"';
 pht(
   "This string requires \x12\x34 double quotes, but ".
   "this string does not. Here, they are used for consistency.");
 pht(
   "This string also requires \123\345 double quotes, but ".
   "this string does not. Here, they are used for consistency.");
diff --git a/src/lint/linter/xhpast/rules/__tests__/duplicate-keys-in-array/duplicate-keys-in-array.lint-test b/src/lint/linter/xhpast/rules/__tests__/duplicate-keys-in-array/duplicate-keys-in-array.lint-test
index d2a7c4ce..67eb27f6 100644
--- a/src/lint/linter/xhpast/rules/__tests__/duplicate-keys-in-array/duplicate-keys-in-array.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/duplicate-keys-in-array/duplicate-keys-in-array.lint-test
@@ -1,43 +1,43 @@
 <?php
 
 $a = array(
   'a' => 'val1',
   $a => 'val2',
   'a' => val3(),
   1 => val4(),
   '1' => val5(),
   1 => $val6,
   'b' => 'val7',
   b() => 'val8',
 );
 static $b = array(
   1 => 'one',
   2 => 'two',
   2 => 'TWO',
 );
 $c = array();
 $d = array(
   A => 'ay',
   A => 'aye',
   'A' => 'AYE',
 );
 $e = array(
   self::B => 'bee',
   self::B => 'bea',
   self::b() => 'ehh',
   self::$b => 'weh',
   B => 'b',
   C::B => 'cb',
 );
 $f = array(
   $a => 'var',
   'a' => 'lit',
   $a => 'var2',
 );
 ~~~~~~~~~~
-error:6:3
-error:9:3
-error:16:3
-error:21:3
-error:26:3
-error:35:3
+error:6:3:XHP22:Duplicate Keys in Array
+error:9:3:XHP22:Duplicate Keys in Array
+error:16:3:XHP22:Duplicate Keys in Array
+error:21:3:XHP22:Duplicate Keys in Array
+error:26:3:XHP22:Duplicate Keys in Array
+error:35:3:XHP22:Duplicate Keys in Array
diff --git a/src/lint/linter/xhpast/rules/__tests__/duplicate-switch-case/duplicate-switch-case.lint-test b/src/lint/linter/xhpast/rules/__tests__/duplicate-switch-case/duplicate-switch-case.lint-test
index 2c8e5c5c..2d95b899 100644
--- a/src/lint/linter/xhpast/rules/__tests__/duplicate-switch-case/duplicate-switch-case.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/duplicate-switch-case/duplicate-switch-case.lint-test
@@ -1,29 +1,29 @@
 <?php
 
 $x = null;
 $y = null;
 switch ($x) {}
 switch ($x) {
   case 1:     break;
   case '1':   break;
   case true:  break;
   case null:  break;
   default:    break;
 }
 switch ($x) {
   case 'foo': break;
   case 'bar': break;
   case 'foo': break;
 
   default:
     switch ($y) {
       case 'foo': break;
       case 'bar': break;
       case 'baz': break;
       case 'baz': break;
     }
     break;
 }
 ~~~~~~~~~~
-error:16:3
-error:23:7
+error:16:3:XHP50:Duplicate Case Statements
+error:23:7:XHP50:Duplicate Case Statements
diff --git a/src/lint/linter/xhpast/rules/__tests__/dynamic-define/dynamic-define.lint-test b/src/lint/linter/xhpast/rules/__tests__/dynamic-define/dynamic-define.lint-test
index 3ac083f3..d88c1692 100644
--- a/src/lint/linter/xhpast/rules/__tests__/dynamic-define/dynamic-define.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/dynamic-define/dynamic-define.lint-test
@@ -1,9 +1,9 @@
 <?php
 
 define('PONY', 'cute');
 define($pony, 'cute');
 define('PONY', $cute);
 define($pony, $cute);
 ~~~~~~~~~~
-error:4:8 dynamic define
-error:6:8 dynamic define
+error:4:8:XHP12:Dynamic `define`
+error:6:8:XHP12:Dynamic `define`
diff --git a/src/lint/linter/xhpast/rules/__tests__/elseif-usage/elseif-usage.lint-test b/src/lint/linter/xhpast/rules/__tests__/elseif-usage/elseif-usage.lint-test
index d906f96d..828bfd85 100644
--- a/src/lint/linter/xhpast/rules/__tests__/elseif-usage/elseif-usage.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/elseif-usage/elseif-usage.lint-test
@@ -1,21 +1,21 @@
 <?php
 
 if (true) {
   echo 'foo';
 } elseif (false) {
   echo 'bar';
 } else if (null) {
   echo 'baz';
 }
 ~~~~~~~~~~
-advice:5:3
+advice:5:3:XHP42:`elseif` Usage
 ~~~~~~~~~~
 <?php
 
 if (true) {
   echo 'foo';
 } else if (false) {
   echo 'bar';
 } else if (null) {
   echo 'baz';
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/empty-statement/empty-statement.lint-test b/src/lint/linter/xhpast/rules/__tests__/empty-statement/empty-statement.lint-test
index 3d352005..6559f5b8 100644
--- a/src/lint/linter/xhpast/rules/__tests__/empty-statement/empty-statement.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/empty-statement/empty-statement.lint-test
@@ -1,23 +1,23 @@
 <?php
 
 function w() {}
 function x() {
   // This is deliberately empty.
 }
 function y() { }
 function z() {
 
 
 }
 ~~~~~~~~~~
-advice:7:14
-advice:8:14
+advice:7:14:XHP47:Empty Block Statement
+advice:8:14:XHP47:Empty Block Statement
 ~~~~~~~~~~
 <?php
 
 function w() {}
 function x() {
   // This is deliberately empty.
 }
 function y() {}
 function z() {}
diff --git a/src/lint/linter/xhpast/rules/__tests__/exit-expression/exit-expression.lint-test b/src/lint/linter/xhpast/rules/__tests__/exit-expression/exit-expression.lint-test
index eef5a6d3..32643f06 100644
--- a/src/lint/linter/xhpast/rules/__tests__/exit-expression/exit-expression.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/exit-expression/exit-expression.lint-test
@@ -1,8 +1,8 @@
 <?php
 
 exit(-1);
 exit -1;
 strtoupper(33 * exit - 6);
 ~~~~~~~~~~
-error:4:1
-error:5:17
+error:4:1:XHP17:`exit` Used as Expression
+error:5:17:XHP17:`exit` Used as Expression
diff --git a/src/lint/linter/xhpast/rules/__tests__/extract-use/extract-use.lint-test b/src/lint/linter/xhpast/rules/__tests__/extract-use/extract-use.lint-test
index 43f13e6c..5d12bcf9 100644
--- a/src/lint/linter/xhpast/rules/__tests__/extract-use/extract-use.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/extract-use/extract-use.lint-test
@@ -1,5 +1,5 @@
 <?php
 
 extract();
 ~~~~~~~~~~
-error:3:1
+error:3:1:XHP4:Use of `extract`
diff --git a/src/lint/linter/xhpast/rules/__tests__/formatted-string/formatted-string.lint-test b/src/lint/linter/xhpast/rules/__tests__/formatted-string/formatted-string.lint-test
index 92ccd54f..388d6d63 100644
--- a/src/lint/linter/xhpast/rules/__tests__/formatted-string/formatted-string.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/formatted-string/formatted-string.lint-test
@@ -1,28 +1,28 @@
 <?php
 
 printf();
 printf(null);
 printf('');
 
 sprintf('%s');
 pht('%s', 'foo', 'bar');
 
 fprintf(null, 'x');
 queryfx(null, 'x', 'y');
 
 foobar(null, null, '%s');
 ~~~~~~~~~~
-error:3:1
-error:7:1
-error:8:1
-error:11:1
-error:13:1
+error:3:1:XHP54:Formatted String
+error:7:1:XHP54:Formatted String
+error:8:1:XHP54:Formatted String
+error:11:1:XHP54:Formatted String
+error:13:1:XHP54:Formatted String
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.printf-functions": {
       "foobar": 2
     }
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/base.lint-test b/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/base.lint-test
index 8514c10f..8d6f22f6 100644
--- a/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/base.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/base.lint-test
@@ -1,12 +1,12 @@
 <?php
 intval($x);
 intval($x, 8);
 intval($x, 10);
 ~~~~~~~~~~
-advice:2:1
-advice:4:1
+advice:2:1:XHP105:Function Call Should Be Type Cast
+advice:4:1:XHP105:Function Call Should Be Type Cast
 ~~~~~~~~~~
 <?php
 (int)$x;
 intval($x, 8);
 (int)$x;
diff --git a/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/binary-expression.lint-test b/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/binary-expression.lint-test
index b3fbc1f9..d80139dc 100644
--- a/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/binary-expression.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/binary-expression.lint-test
@@ -1,7 +1,7 @@
 <?php
 intval($x / 2) + 1;
 ~~~~~~~~~~
-advice:2:1
+advice:2:1:XHP105:Function Call Should Be Type Cast
 ~~~~~~~~~~
 <?php
 (int)($x / 2) + 1;
diff --git a/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/cast-functions.lint-test b/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/cast-functions.lint-test
index 805c6200..079591cf 100644
--- a/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/cast-functions.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/cast-functions.lint-test
@@ -1,19 +1,19 @@
 <?php
 boolval($x);
 doubleval($x);
 floatval($x);
 intval($x);
 strval($x);
 ~~~~~~~~~~
-advice:2:1
-advice:3:1
-advice:4:1
-advice:5:1
-advice:6:1
+advice:2:1:XHP105:Function Call Should Be Type Cast
+advice:3:1:XHP105:Function Call Should Be Type Cast
+advice:4:1:XHP105:Function Call Should Be Type Cast
+advice:5:1:XHP105:Function Call Should Be Type Cast
+advice:6:1:XHP105:Function Call Should Be Type Cast
 ~~~~~~~~~~
 <?php
 (bool)$x;
 (double)$x;
 (double)$x;
 (int)$x;
 (string)$x;
diff --git a/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/parameter-mismatch.lint-test b/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/parameter-mismatch.lint-test
index 9af460f0..c1baccf6 100644
--- a/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/parameter-mismatch.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/function-call-should-be-type-cast/parameter-mismatch.lint-test
@@ -1,11 +1,11 @@
 <?php
 // If the function call doesn't have exactly one parameter,
 // we don't provide an autofix.
 strval($x, $y);
 ~~~~~~~~~~
-advice:4:1
+advice:4:1:XHP105:Function Call Should Be Type Cast
 ~~~~~~~~~~
 <?php
 // If the function call doesn't have exactly one parameter,
 // we don't provide an autofix.
 strval($x, $y);
diff --git a/src/lint/linter/xhpast/rules/__tests__/global-variable/global-variable.lint-test b/src/lint/linter/xhpast/rules/__tests__/global-variable/global-variable.lint-test
index 11e7a213..3979f932 100644
--- a/src/lint/linter/xhpast/rules/__tests__/global-variable/global-variable.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/global-variable/global-variable.lint-test
@@ -1,9 +1,9 @@
 <?php
 
 global $BASE_URL;
 function foo() {
   global $x, $y;
 }
 ~~~~~~~~~~
-warning:3:1
-warning:5:3
+warning:3:1:XHP79:Global Variables
+warning:5:3:XHP79:Global Variables
diff --git a/src/lint/linter/xhpast/rules/__tests__/hexadecimal-numeric-scalar-casing/hexadecimal.lint-test b/src/lint/linter/xhpast/rules/__tests__/hexadecimal-numeric-scalar-casing/hexadecimal.lint-test
index aae5eec7..a8c2c10d 100644
--- a/src/lint/linter/xhpast/rules/__tests__/hexadecimal-numeric-scalar-casing/hexadecimal.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/hexadecimal-numeric-scalar-casing/hexadecimal.lint-test
@@ -1,12 +1,12 @@
 <?php
 0xFF;
 0xff;
 0XFF;
 ~~~~~~~~~~
-warning:3:1
-warning:4:1
+warning:3:1:XHP127:Hexadecimal Integer Casing
+warning:4:1:XHP127:Hexadecimal Integer Casing
 ~~~~~~~~~~
 <?php
 0xFF;
 0xFF;
 0xFF;
diff --git a/src/lint/linter/xhpast/rules/__tests__/implicit-constructor/implicit-constructor.lint-test b/src/lint/linter/xhpast/rules/__tests__/implicit-constructor/implicit-constructor.lint-test
index fa42ce26..400f3faf 100644
--- a/src/lint/linter/xhpast/rules/__tests__/implicit-constructor/implicit-constructor.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/implicit-constructor/implicit-constructor.lint-test
@@ -1,9 +1,9 @@
 <?php
 
 final class Platypus {
   public function platypus() {
     // This method must be renamed to __construct().
   }
 }
 ~~~~~~~~~~
-error:4:19
+error:4:19:XHP10:Implicit Constructor
diff --git a/src/lint/linter/xhpast/rules/__tests__/implicit-fallthrough/implicit-fallthrough.lint-test b/src/lint/linter/xhpast/rules/__tests__/implicit-fallthrough/implicit-fallthrough.lint-test
index 6c6fa944..818d9960 100644
--- a/src/lint/linter/xhpast/rules/__tests__/implicit-fallthrough/implicit-fallthrough.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/implicit-fallthrough/implicit-fallthrough.lint-test
@@ -1,100 +1,100 @@
 <?php
 
 $x = 0;
 $y = 0;
 
 switch ($x) {
   case 1:
     $x++;
     continue;
   case 2:
     $x++;
     break;
   case 3:
     $x++;
     return;
   case 4:
     $x++;
     throw new Exception('!');
   case 5:
     break 2;
   case 6:
     continue 2;
   case 7:
   case 8:
     $x++;
     break;
   case 9:
     $x++;
     /* fallthrough */
   case 10:
     $x++;
     break;
   case 11:
     $x++;
     exit(1);
   default:
     break;
 }
 
 switch ($x) {
   case 1:
     $x++;
   case 2:
     break;
 }
 
 switch ($x) {
   default:
     $x++;
 }
 
 switch ($x) {
   case 1:
     while (true) {
       break;
     }
   case 2:
     switch ($y) {
       case 1:
         break;
     }
   case 3:
     while (true) {
       return;
     }
   case 4:
     function f() { throw new Exception(); }
     g(function () { return; });
     final class C { public function m() { return; } }
     interface I {}
   case 5:
     do {
       break;
     } while (true);
   case 6:
     // We accept this "false" positive because the construction is bizarre and
     // the author can easily add an unreachable "break;" for clarity.
     do {
       break 2;
     } while (true);
   case 7:
     /* fallthrough */
   case 8:
     throw_exception();
 }
 ~~~~~~~~~~
-warning:41:3
-warning:48:3
-warning:53:3
-warning:57:3
-warning:66:3
-warning:71:3
-warning:75:3
+warning:41:3:XHP30:Implicit Fallthrough
+warning:48:3:XHP30:Implicit Fallthrough
+warning:53:3:XHP30:Implicit Fallthrough
+warning:57:3:XHP30:Implicit Fallthrough
+warning:66:3:XHP30:Implicit Fallthrough
+warning:71:3:XHP30:Implicit Fallthrough
+warning:75:3:XHP30:Implicit Fallthrough
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config":{
     "xhpast.switchhook":"ArcanistTestXHPASTLintSwitchHook"
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/implicit-visibility/implicit-visibility.lint-test b/src/lint/linter/xhpast/rules/__tests__/implicit-visibility/implicit-visibility.lint-test
index 03139666..29ff8e04 100644
--- a/src/lint/linter/xhpast/rules/__tests__/implicit-visibility/implicit-visibility.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/implicit-visibility/implicit-visibility.lint-test
@@ -1,30 +1,30 @@
 <?php
 
 final class Foo {
   public function bar() {}
   function baz() {}
   abstract function a();
   private static function b() {}
 
   var $x;
   static $y;
   private $z;
 }
 ~~~~~~~~~~
-advice:5:3
-advice:6:3
-advice:9:3
-advice:10:3
+advice:5:3:XHP52:Implicit Method Visibility
+advice:6:3:XHP52:Implicit Method Visibility
+advice:9:3:XHP52:Implicit Method Visibility
+advice:10:3:XHP52:Implicit Method Visibility
 ~~~~~~~~~~
 <?php
 
 final class Foo {
   public function bar() {}
   public function baz() {}
   public abstract function a();
   private static function b() {}
 
   public $x;
   public static $y;
   private $z;
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/inline-html/inline-html.lint-test b/src/lint/linter/xhpast/rules/__tests__/inline-html/inline-html.lint-test
index 13cdd0d1..3c580835 100644
--- a/src/lint/linter/xhpast/rules/__tests__/inline-html/inline-html.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/inline-html/inline-html.lint-test
@@ -1,4 +1,4 @@
 #!/usr/bin/env php
 <html>
 ~~~~~~~~~~
-disabled:2:1
+disabled:2:1:XHP78:Inline HTML
diff --git a/src/lint/linter/xhpast/rules/__tests__/inner-function/inner-function.lint-test b/src/lint/linter/xhpast/rules/__tests__/inner-function/inner-function.lint-test
index 6294eb0a..d4f73fc1 100644
--- a/src/lint/linter/xhpast/rules/__tests__/inner-function/inner-function.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/inner-function/inner-function.lint-test
@@ -1,14 +1,14 @@
 <?php
 
 function outer() {
   if (!function_exists('inner')) {
     function inner() {}
   }
 }
 
 // Closures are allowed.
 function my_func($foo) {
   function () {};
 }
 ~~~~~~~~~~
-warning:5:5
+warning:5:5:XHP59:Inner Functions
diff --git a/src/lint/linter/xhpast/rules/__tests__/instanceof-operator/instanceof-operator.lint-test b/src/lint/linter/xhpast/rules/__tests__/instanceof-operator/instanceof-operator.lint-test
index 62d6a867..53ecc82a 100644
--- a/src/lint/linter/xhpast/rules/__tests__/instanceof-operator/instanceof-operator.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/instanceof-operator/instanceof-operator.lint-test
@@ -1,10 +1,10 @@
 <?php
 
 var_dump('foobar' instanceof stdClass);
 var_dump(123 instanceof stdClass);
 var_dump(null instanceof stdClass);
 var_dump($x instanceof stdClass);
 ~~~~~~~~~~
-error:3:10
-error:4:10
-error:5:10
+error:3:10:XHP69:`instanceof` Operator
+error:4:10:XHP69:`instanceof` Operator
+error:5:10:XHP69:`instanceof` Operator
diff --git a/src/lint/linter/xhpast/rules/__tests__/interface-abstract-method/abstract.lint-test b/src/lint/linter/xhpast/rules/__tests__/interface-abstract-method/abstract.lint-test
index 91180e9e..7ee0956f 100644
--- a/src/lint/linter/xhpast/rules/__tests__/interface-abstract-method/abstract.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/interface-abstract-method/abstract.lint-test
@@ -1,7 +1,7 @@
 <?php
 
 interface SomeInterface {
   abstract public function someMethod();
 }
 ~~~~~~~~~~
-error:4:3
+error:4:3:XHP118:`interface` Methods Cannot Be Marked `abstract`
diff --git a/src/lint/linter/xhpast/rules/__tests__/interface-method-body/body.lint-test b/src/lint/linter/xhpast/rules/__tests__/interface-method-body/body.lint-test
index 2baa5cd5..2f9398ea 100644
--- a/src/lint/linter/xhpast/rules/__tests__/interface-method-body/body.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/interface-method-body/body.lint-test
@@ -1,7 +1,7 @@
 <?php
 
 interface SomeInterface {
   public function someMethod() {}
 }
 ~~~~~~~~~~
-error:4:32
+error:4:32:XHP114:`interface` Method Cannot Contain Body
diff --git a/src/lint/linter/xhpast/rules/__tests__/invalid-default-parameter/invalid-default-parameter.lint-test b/src/lint/linter/xhpast/rules/__tests__/invalid-default-parameter/invalid-default-parameter.lint-test
index ecd63967..6e090166 100644
--- a/src/lint/linter/xhpast/rules/__tests__/invalid-default-parameter/invalid-default-parameter.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/invalid-default-parameter/invalid-default-parameter.lint-test
@@ -1,18 +1,18 @@
 <?php
 
 function func_one(array $x) {}
 function func_two(array $x = null) {}
 function func_three(array $x = array()) {}
 function func_four(array $x = false) {}
 
 function func_five(callable $x) {}
 function func_six(callable $x = null) {}
 function func_seven(callable $x = false) {}
 
 function func_eight(stdClass $x) {}
 function func_nine(stdClass $x = null) {}
 function func_ten(stdClass $x = array()) {}
 ~~~~~~~~~~
-error:6:31
-error:10:35
-error:14:33
+error:6:31:XHP70:Invalid Default Parameter
+error:10:35:XHP70:Invalid Default Parameter
+error:14:33:XHP70:Invalid Default Parameter
diff --git a/src/lint/linter/xhpast/rules/__tests__/invalid-modifiers/invalid-modifiers.lint-test b/src/lint/linter/xhpast/rules/__tests__/invalid-modifiers/invalid-modifiers.lint-test
index b461bb39..1490d748 100644
--- a/src/lint/linter/xhpast/rules/__tests__/invalid-modifiers/invalid-modifiers.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/invalid-modifiers/invalid-modifiers.lint-test
@@ -1,18 +1,18 @@
 <?php
 
 class SomeClass {
   public $a;
   public public $b;
   public protected $c;
   private abstract $d;
 
   public function foo() {}
   public protected function bar() {}
   abstract final public function baz() {}
 }
 ~~~~~~~~~~
-error:5:10
-error:6:10
-error:7:11
-error:10:10
-error:11:12
+error:5:10:XHP72:Invalid Modifiers
+error:6:10:XHP72:Invalid Modifiers
+error:7:11:XHP72:Invalid Modifiers
+error:10:10:XHP72:Invalid Modifiers
+error:11:12:XHP72:Invalid Modifiers
diff --git a/src/lint/linter/xhpast/rules/__tests__/invalid-octal-numeric-scalar/octal.lint-test b/src/lint/linter/xhpast/rules/__tests__/invalid-octal-numeric-scalar/octal.lint-test
index a5bd509d..0ca10e61 100644
--- a/src/lint/linter/xhpast/rules/__tests__/invalid-octal-numeric-scalar/octal.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/invalid-octal-numeric-scalar/octal.lint-test
@@ -1,7 +1,7 @@
 <?php
 01234567;
 08;
 -08;
 ~~~~~~~~
-error:3:1
-error:4:2
+error:3:1:XHP125:Invalid Octal Numeric Scalar
+error:4:2:XHP125:Invalid Octal Numeric Scalar
diff --git a/src/lint/linter/xhpast/rules/__tests__/is_a-should-be-instanceof/is_a.lint-test b/src/lint/linter/xhpast/rules/__tests__/is_a-should-be-instanceof/is_a.lint-test
index 3362c41c..452eb238 100644
--- a/src/lint/linter/xhpast/rules/__tests__/is_a-should-be-instanceof/is_a.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/is_a-should-be-instanceof/is_a.lint-test
@@ -1,16 +1,16 @@
 <?php
 is_a($x, $y);
 is_a($x, 'SomeClass');
 is_a($x, '\\SomeClass');
 is_a($x, '\\'.'Some'.'Class');
 ~~~~~~~~~~
-advice:2:1
-advice:3:1
-advice:4:1
-advice:5:1
+advice:2:1:XHP111:`is_a` Should Be `instanceof`
+advice:3:1:XHP111:`is_a` Should Be `instanceof`
+advice:4:1:XHP111:`is_a` Should Be `instanceof`
+advice:5:1:XHP111:`is_a` Should Be `instanceof`
 ~~~~~~~~~~
 <?php
 $x instanceof $y;
 $x instanceof SomeClass;
 $x instanceof \SomeClass;
 is_a($x, '\\'.'Some'.'Class');
diff --git a/src/lint/linter/xhpast/rules/__tests__/keyword-casing/keyword-casing.lint-test b/src/lint/linter/xhpast/rules/__tests__/keyword-casing/keyword-casing.lint-test
index e813ec40..35d47133 100644
--- a/src/lint/linter/xhpast/rules/__tests__/keyword-casing/keyword-casing.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/keyword-casing/keyword-casing.lint-test
@@ -1,46 +1,46 @@
 <?php
 
 true;
 false;
 null;
 True;
 False;
 NULL;
 nUlL;
 array();
 Array();
 
 function f(array $x, ArRaY $y) {}
 
 new C();
 NeW C();
 
 echo __file__;
 ~~~~~~~~~~
-warning:6:1
-warning:7:1
-warning:8:1
-warning:9:1
-warning:11:1
-warning:13:22
-warning:16:1
-warning:18:6
+warning:6:1:XHP40:Keyword Conventions
+warning:7:1:XHP40:Keyword Conventions
+warning:8:1:XHP40:Keyword Conventions
+warning:9:1:XHP40:Keyword Conventions
+warning:11:1:XHP40:Keyword Conventions
+warning:13:22:XHP40:Keyword Conventions
+warning:16:1:XHP40:Keyword Conventions
+warning:18:6:XHP40:Keyword Conventions
 ~~~~~~~~~~
 <?php
 
 true;
 false;
 null;
 true;
 false;
 null;
 null;
 array();
 array();
 
 function f(array $x, array $y) {}
 
 new C();
 new C();
 
 echo __FILE__;
diff --git a/src/lint/linter/xhpast/rules/__tests__/keyword-casing/parent.lint-test b/src/lint/linter/xhpast/rules/__tests__/keyword-casing/parent.lint-test
index 281f4148..44147f2b 100644
--- a/src/lint/linter/xhpast/rules/__tests__/keyword-casing/parent.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/keyword-casing/parent.lint-test
@@ -1,25 +1,25 @@
 <?php
 
 class Foo extends Bar {
   public static function doSomething() {
     return PARENT::doSomething();
   }
 
   public static function doSomethingElse() {
     return parent::doSomethingElse();
   }
 }
 ~~~~~~~~~~
-warning:5:12
+warning:5:12:XHP40:Keyword Conventions
 ~~~~~~~~~~
 <?php
 
 class Foo extends Bar {
   public static function doSomething() {
     return parent::doSomething();
   }
 
   public static function doSomethingElse() {
     return parent::doSomethingElse();
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/keyword-casing/self.lint-test b/src/lint/linter/xhpast/rules/__tests__/keyword-casing/self.lint-test
index 59692bd3..b90573ba 100644
--- a/src/lint/linter/xhpast/rules/__tests__/keyword-casing/self.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/keyword-casing/self.lint-test
@@ -1,25 +1,25 @@
 <?php
 
 class Foo extends Bar {
   public static function doSomething() {
     return SELF::doSomethingElse();
   }
 
   public static function doSomethingElse() {
     return self::doSomething();
   }
 }
 ~~~~~~~~~~
-warning:5:12
+warning:5:12:XHP40:Keyword Conventions
 ~~~~~~~~~~
 <?php
 
 class Foo extends Bar {
   public static function doSomething() {
     return self::doSomethingElse();
   }
 
   public static function doSomethingElse() {
     return self::doSomething();
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/language-construct-parentheses/language-construct-parentheses.lint-test b/src/lint/linter/xhpast/rules/__tests__/language-construct-parentheses/language-construct-parentheses.lint-test
index b95f3c20..9b5cae5e 100644
--- a/src/lint/linter/xhpast/rules/__tests__/language-construct-parentheses/language-construct-parentheses.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/language-construct-parentheses/language-construct-parentheses.lint-test
@@ -1,50 +1,50 @@
 <?php
 
 include 'foo.php';
 include_once 'foo.php';
 require 'foo.php';
 require_once 'foo.php';
 echo 'foo';
 
 include('bar.php');
 include_once('bar.php');
 require('bar.php');
 require_once('bar.php');
 echo('bar');
 
 include ('baz.php');
 include_once ('baz.php');
 require ('baz.php');
 require_once ('baz.php');
 echo ('baz');
 ~~~~~~~~~~
-warning:9:8
-warning:10:13
-warning:11:8
-warning:12:13
-warning:13:5
-warning:15:9
-warning:16:14
-warning:17:9
-warning:18:14
-warning:19:6
+warning:9:8:XHP46:Language Construct Parentheses
+warning:10:13:XHP46:Language Construct Parentheses
+warning:11:8:XHP46:Language Construct Parentheses
+warning:12:13:XHP46:Language Construct Parentheses
+warning:13:5:XHP46:Language Construct Parentheses
+warning:15:9:XHP46:Language Construct Parentheses
+warning:16:14:XHP46:Language Construct Parentheses
+warning:17:9:XHP46:Language Construct Parentheses
+warning:18:14:XHP46:Language Construct Parentheses
+warning:19:6:XHP46:Language Construct Parentheses
 ~~~~~~~~~~
 <?php
 
 include 'foo.php';
 include_once 'foo.php';
 require 'foo.php';
 require_once 'foo.php';
 echo 'foo';
 
 include 'bar.php';
 include_once 'bar.php';
 require 'bar.php';
 require_once 'bar.php';
 echo 'bar';
 
 include 'baz.php';
 include_once 'baz.php';
 require 'baz.php';
 require_once 'baz.php';
 echo 'baz';
diff --git a/src/lint/linter/xhpast/rules/__tests__/list-assignment/list-assignment.lint-test b/src/lint/linter/xhpast/rules/__tests__/list-assignment/list-assignment.lint-test
index 769e95de..8b647ddd 100644
--- a/src/lint/linter/xhpast/rules/__tests__/list-assignment/list-assignment.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/list-assignment/list-assignment.lint-test
@@ -1,13 +1,13 @@
 <?php
 
 list($x, $y, , ,) = array();
 list($x, $y, , , $z) = array();
 ~~~~~~~~~~
-warning:3:12
-warning:3:14
-warning:3:16
+warning:3:12:XHP77:List Assignment
+warning:3:14:XHP77:List Assignment
+warning:3:16:XHP77:List Assignment
 ~~~~~~~~~~
 <?php
 
 list($x, $y  ) = array();
 list($x, $y, , , $z) = array();
diff --git a/src/lint/linter/xhpast/rules/__tests__/logical-operators/logical-operators.lint-test b/src/lint/linter/xhpast/rules/__tests__/logical-operators/logical-operators.lint-test
index 5b9dac62..4df0e276 100644
--- a/src/lint/linter/xhpast/rules/__tests__/logical-operators/logical-operators.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/logical-operators/logical-operators.lint-test
@@ -1,22 +1,22 @@
 <?php
 
 $x = false;
 $y = true;
 
 $x and $y;
 $x && $y;
 $x or $y;
 $x || $y;
 ~~~~~~~~~~
-advice:6:4
-advice:8:4
+advice:6:4:XHP58:Logical Operators
+advice:8:4:XHP58:Logical Operators
 ~~~~~~~~~~
 <?php
 
 $x = false;
 $y = true;
 
 $x && $y;
 $x && $y;
 $x || $y;
 $x || $y;
diff --git a/src/lint/linter/xhpast/rules/__tests__/lowercase-functions/lowercase-functions.lint-test b/src/lint/linter/xhpast/rules/__tests__/lowercase-functions/lowercase-functions.lint-test
index dc08b9d2..2a77b1db 100644
--- a/src/lint/linter/xhpast/rules/__tests__/lowercase-functions/lowercase-functions.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/lowercase-functions/lowercase-functions.lint-test
@@ -1,11 +1,11 @@
 <?php
 
 var_dump('');
 Var_Dump('');
 ~~~~~~~~~~
-advice:4:1
+advice:4:1:XHP61:Lowercase Functions
 ~~~~~~~~~~
 <?php
 
 var_dump('');
 var_dump('');
diff --git a/src/lint/linter/xhpast/rules/__tests__/modifier-ordering/modifier-ordering.lint-test b/src/lint/linter/xhpast/rules/__tests__/modifier-ordering/modifier-ordering.lint-test
index ac0927f3..0df87cef 100644
--- a/src/lint/linter/xhpast/rules/__tests__/modifier-ordering/modifier-ordering.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/modifier-ordering/modifier-ordering.lint-test
@@ -1,25 +1,25 @@
 <?php
 
 class Foo {
   public $x;
   static protected $y;
 
   public final function bar() {}
   private function baz() {}
   static final public function foobar() {}
 }
 ~~~~~~~~~~
-advice:5:3
-advice:7:3
-advice:9:3
+advice:5:3:XHP71:Modifier Ordering
+advice:7:3:XHP71:Modifier Ordering
+advice:9:3:XHP71:Modifier Ordering
 ~~~~~~~~~~
 <?php
 
 class Foo {
   public $x;
   protected static $y;
 
   final public function bar() {}
   private function baz() {}
   final public static function foobar() {}
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/namespace-first-statement/class-before-namespace.lint-test b/src/lint/linter/xhpast/rules/__tests__/namespace-first-statement/class-before-namespace.lint-test
index 7af115cc..de6871b3 100644
--- a/src/lint/linter/xhpast/rules/__tests__/namespace-first-statement/class-before-namespace.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/namespace-first-statement/class-before-namespace.lint-test
@@ -1,5 +1,5 @@
 <?php
 class X {}
 namespace X;
 ~~~~~~~~~~
-error:2:1
+error:2:1:XHP98:`namespace` Statement Must Be The First Statement
diff --git a/src/lint/linter/xhpast/rules/__tests__/namespace-first-statement/incorrect.lint-test b/src/lint/linter/xhpast/rules/__tests__/namespace-first-statement/incorrect.lint-test
index f2fd0e3b..998aa637 100644
--- a/src/lint/linter/xhpast/rules/__tests__/namespace-first-statement/incorrect.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/namespace-first-statement/incorrect.lint-test
@@ -1,16 +1,16 @@
 <?php
 
 /**
  * This is actually perfectly valid, for some unknown reason.
  *
  * TODO: Maybe fix the handling of this edge case.
  */
 
 1;
 
 namespace X {
   class C { }
   echo 2;
 }
 ~~~~~~~~~~
-error:9:1
+error:9:1:XHP98:`namespace` Statement Must Be The First Statement
diff --git a/src/lint/linter/xhpast/rules/__tests__/naming-conventions/constant-case.lint-test b/src/lint/linter/xhpast/rules/__tests__/naming-conventions/constant-case.lint-test
index 420b0292..d4f8d044 100644
--- a/src/lint/linter/xhpast/rules/__tests__/naming-conventions/constant-case.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/naming-conventions/constant-case.lint-test
@@ -1,12 +1,12 @@
 <?php
 
 define('foo', 'bar');
 const bar = 'baz';
 
 class Foo {
   const bar = 'baz';
 }
 ~~~~~~~~~~
-warning:3:8
-warning:4:7
-warning:7:9
+warning:3:8:XHP9:Naming Conventions
+warning:4:7:XHP9:Naming Conventions
+warning:7:9:XHP9:Naming Conventions
diff --git a/src/lint/linter/xhpast/rules/__tests__/naming-conventions/naming-conventions.lint-test b/src/lint/linter/xhpast/rules/__tests__/naming-conventions/naming-conventions.lint-test
index c83a9b00..c05ff347 100644
--- a/src/lint/linter/xhpast/rules/__tests__/naming-conventions/naming-conventions.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/naming-conventions/naming-conventions.lint-test
@@ -1,71 +1,71 @@
 <?php
 
 final class a {
   const b = 1, c = d;
   protected $E, $H;
   public function F($G, $GG) {}
 }
 
 interface i {}
 
 function YY($ZZ) {}
 
 final class Quack {
   const R = 1, S = 2;
   protected $tX, $uY;
   public function vV($w_w) {}
 }
 
 function () use ($this_is_a_closure) {};
 
 function f(&$YY) {}
 
 function g() {
   $lowerCamelCase = 0;
   $UpperCamelCase = 0;
   $UPPERCASE_WITH_UNDERSCORES = 0;
   $lowercase_with_underscores = 0;
   $mIxEd_CaSe = 0;
 }
 
 function h() {
   global $mIxEd_CaSe;
   $mIxEd_CaSe = 2;
   $GLOBALS[0] = 2;
   $_ENV[0] = 1;
 }
 
 function i() {
   self::$X_x;
   Other::$Y_y;
   parent::$Z_z;
   self::$X_x[0];
   Other::$Y_y[0];
   parent::$Z_z[0];
 }
 
 function j() {
   // Test case for bug where any static access would shadow other variables.
   Other::$y = 0;
   $mIxEdCaSe = 1;
 }
 ~~~~~~~~~~
-warning:3:13
-warning:4:9
-warning:4:9
-warning:4:16
-warning:4:16
-warning:5:13
-warning:5:17
-warning:6:19
-warning:6:21
-warning:6:25
-warning:9:11
-warning:11:10
-warning:11:13
-warning:21:13
-warning:24:3
-warning:25:3
-warning:26:3
-warning:28:3
-warning:50:3
+warning:3:13:XHP9:Naming Conventions
+warning:4:9:XHP9:Naming Conventions
+warning:4:9:XHP9:Naming Conventions
+warning:4:16:XHP9:Naming Conventions
+warning:4:16:XHP9:Naming Conventions
+warning:5:13:XHP9:Naming Conventions
+warning:5:17:XHP9:Naming Conventions
+warning:6:19:XHP9:Naming Conventions
+warning:6:21:XHP9:Naming Conventions
+warning:6:25:XHP9:Naming Conventions
+warning:9:11:XHP9:Naming Conventions
+warning:11:10:XHP9:Naming Conventions
+warning:11:13:XHP9:Naming Conventions
+warning:21:13:XHP9:Naming Conventions
+warning:24:3:XHP9:Naming Conventions
+warning:25:3:XHP9:Naming Conventions
+warning:26:3:XHP9:Naming Conventions
+warning:28:3:XHP9:Naming Conventions
+warning:50:3:XHP9:Naming Conventions
diff --git a/src/lint/linter/xhpast/rules/__tests__/nested-namespaces/nested.lint-test b/src/lint/linter/xhpast/rules/__tests__/nested-namespaces/nested.lint-test
index ef3d5757..9617119e 100644
--- a/src/lint/linter/xhpast/rules/__tests__/nested-namespaces/nested.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/nested-namespaces/nested.lint-test
@@ -1,9 +1,9 @@
 <?php
 namespace X {
   namespace Y {
     namespace Z {}
   }
 }
 ~~~~~~~~~~
-error:3:3
-error:4:5
+error:3:3:XHP90:Nested `namespace` Statements
+error:4:5:XHP90:Nested `namespace` Statements
diff --git a/src/lint/linter/xhpast/rules/__tests__/newline-after-open-tag/newline-after-open-tag.lint-test b/src/lint/linter/xhpast/rules/__tests__/newline-after-open-tag/newline-after-open-tag.lint-test
index 4fc49641..be5250b5 100644
--- a/src/lint/linter/xhpast/rules/__tests__/newline-after-open-tag/newline-after-open-tag.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/newline-after-open-tag/newline-after-open-tag.lint-test
@@ -1,24 +1,24 @@
 <?php phpinfo() ?>
 <?    phpinfo(); ?>
 
 <?php
 phpinfo();
 ?>
 
 <?
 phpinfo();
 ~~~~~~~~~~
-advice:4:6
-advice:8:3
+advice:4:6:XHP81:Newline After PHP Open Tag
+advice:8:3:XHP81:Newline After PHP Open Tag
 ~~~~~~~~~~
 <?php phpinfo() ?>
 <?    phpinfo(); ?>
 
 <?php
 
 phpinfo();
 ?>
 
 <?
 
 phpinfo();
diff --git a/src/lint/linter/xhpast/rules/__tests__/no-parent-scope/no-parent-scope.lint-test b/src/lint/linter/xhpast/rules/__tests__/no-parent-scope/no-parent-scope.lint-test
index b9389611..fb65df66 100644
--- a/src/lint/linter/xhpast/rules/__tests__/no-parent-scope/no-parent-scope.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/no-parent-scope/no-parent-scope.lint-test
@@ -1,19 +1,19 @@
 <?php
 
 final class MyValidClass extends SomeOtherClass {
   public function __construct() {
     parent::__construct(null);
   }
 }
 
 final class MyInvalidClass {
   public function __construct() {
     parent::__construct(null);
   }
 
   public function someMethod($x) {
     echo $x::SOME_CONSTANT;
   }
 }
 ~~~~~~~~~~
-error:11:5
+error:11:5:XHP64:No Parent Scope
diff --git a/src/lint/linter/xhpast/rules/__tests__/object-operator-spacing/object-operator-spacing.lint-test b/src/lint/linter/xhpast/rules/__tests__/object-operator-spacing/object-operator-spacing.lint-test
index 462f4d42..3e181a6a 100644
--- a/src/lint/linter/xhpast/rules/__tests__/object-operator-spacing/object-operator-spacing.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/object-operator-spacing/object-operator-spacing.lint-test
@@ -1,14 +1,14 @@
 <?php
 
 $x -> doSomething();
 id(new Something())
   ->doSomething();
 ~~~~~~~~~~
-warning:3:3
-warning:3:6
+warning:3:3:XHP74:Object Operator Spacing
+warning:3:6:XHP74:Object Operator Spacing
 ~~~~~~~~~~
 <?php
 
 $x->doSomething();
 id(new Something())
   ->doSomething();
diff --git a/src/lint/linter/xhpast/rules/__tests__/paamayim-nekudotayim-spacing/paamayim-nekudotayim-spacing.lint-test b/src/lint/linter/xhpast/rules/__tests__/paamayim-nekudotayim-spacing/paamayim-nekudotayim-spacing.lint-test
index 7ee65d7b..67a6c11d 100644
--- a/src/lint/linter/xhpast/rules/__tests__/paamayim-nekudotayim-spacing/paamayim-nekudotayim-spacing.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/paamayim-nekudotayim-spacing/paamayim-nekudotayim-spacing.lint-test
@@ -1,36 +1,36 @@
 <?php
 
 class Foo extends Bar {
   public function bar() {
     echo self::FOOBAR;
     echo self :: FOOBAR;
   }
 }
 
 MyClass::myMethod();
 MyClass :: myMethod();
 
 MyClass::$myProperty;
 MyClass :: $myProperty;
 ~~~~~~~~~~
-warning:6:14
-warning:6:17
-warning:11:8
-warning:11:11
-warning:14:8
-warning:14:11
+warning:6:14:XHP96:Paamayim Nekudotayim Spacing
+warning:6:17:XHP96:Paamayim Nekudotayim Spacing
+warning:11:8:XHP96:Paamayim Nekudotayim Spacing
+warning:11:11:XHP96:Paamayim Nekudotayim Spacing
+warning:14:8:XHP96:Paamayim Nekudotayim Spacing
+warning:14:11:XHP96:Paamayim Nekudotayim Spacing
 ~~~~~~~~~~
 <?php
 
 class Foo extends Bar {
   public function bar() {
     echo self::FOOBAR;
     echo self::FOOBAR;
   }
 }
 
 MyClass::myMethod();
 MyClass::myMethod();
 
 MyClass::$myProperty;
 MyClass::$myProperty;
diff --git a/src/lint/linter/xhpast/rules/__tests__/parent-member-references/parent.lint-test b/src/lint/linter/xhpast/rules/__tests__/parent-member-references/parent.lint-test
index a31fd6b5..492f0955 100644
--- a/src/lint/linter/xhpast/rules/__tests__/parent-member-references/parent.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/parent-member-references/parent.lint-test
@@ -1,15 +1,15 @@
 <?php
 class Foo extends Bar {
   public function someMethod() {
     Bar::someOtherMethod();
   }
 }
 ~~~~~~~~~~
-warning:4:5
+warning:4:5:XHP83:Parent Member Reference
 ~~~~~~~~~~
 <?php
 class Foo extends Bar {
   public function someMethod() {
     parent::someOtherMethod();
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/parentheses-spacing/array.lint-test b/src/lint/linter/xhpast/rules/__tests__/parentheses-spacing/array.lint-test
index c23be0b1..750e8c65 100644
--- a/src/lint/linter/xhpast/rules/__tests__/parentheses-spacing/array.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/parentheses-spacing/array.lint-test
@@ -1,18 +1,18 @@
 <?php
 
 array ( 1, 2, 3 );
 list ( $x, $y ) = array();
 [ 1, 2 , 3 ];
 ~~~~~~~~~~
-warning:3:8
-warning:3:16
-warning:4:7
-warning:4:14
-warning:5:2
-warning:5:11
+warning:3:8:XHP25:Spaces Inside Parentheses
+warning:3:16:XHP25:Spaces Inside Parentheses
+warning:4:7:XHP25:Spaces Inside Parentheses
+warning:4:14:XHP25:Spaces Inside Parentheses
+warning:5:2:XHP25:Spaces Inside Parentheses
+warning:5:11:XHP25:Spaces Inside Parentheses
 ~~~~~~~~~~
 <?php
 
 array (1, 2, 3);
 list ($x, $y) = array();
 [1, 2 , 3];
diff --git a/src/lint/linter/xhpast/rules/__tests__/parentheses-spacing/parentheses-spacing.lint-test b/src/lint/linter/xhpast/rules/__tests__/parentheses-spacing/parentheses-spacing.lint-test
index 784fc828..4642b112 100644
--- a/src/lint/linter/xhpast/rules/__tests__/parentheses-spacing/parentheses-spacing.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/parentheses-spacing/parentheses-spacing.lint-test
@@ -1,62 +1,62 @@
 <?php
 
 if ( $x ) {}
 f( );
 q(                      );
 g();
 if ($x) {} else if ( $y ) {}
 
 $obj->m(
   $x,
   $y,
   $z);
 for ( $ii = 0; $ii < 1; $ii++ ) {}
 foreach ( $x as $y ) {}
 function q( $x ) {}
 final class X {
   public function f( $y ) {}
 }
 foreach ( $z as $k => $v ) {}
 some_call( /* respect authorial intent */ $b,
   $a // if comments are present
   );
 ~~~~~~~~~~
-warning:3:5
-warning:3:8
-warning:4:3
-warning:5:3
-warning:7:21
-warning:7:24
-warning:13:6
-warning:13:30
-warning:14:10
-warning:14:19
-warning:15:12
-warning:15:15
-warning:17:21
-warning:17:24
-warning:19:10
-warning:19:25
+warning:3:5:XHP25:Spaces Inside Parentheses
+warning:3:8:XHP25:Spaces Inside Parentheses
+warning:4:3:XHP25:Spaces Inside Parentheses
+warning:5:3:XHP25:Spaces Inside Parentheses
+warning:7:21:XHP25:Spaces Inside Parentheses
+warning:7:24:XHP25:Spaces Inside Parentheses
+warning:13:6:XHP25:Spaces Inside Parentheses
+warning:13:30:XHP25:Spaces Inside Parentheses
+warning:14:10:XHP25:Spaces Inside Parentheses
+warning:14:19:XHP25:Spaces Inside Parentheses
+warning:15:12:XHP25:Spaces Inside Parentheses
+warning:15:15:XHP25:Spaces Inside Parentheses
+warning:17:21:XHP25:Spaces Inside Parentheses
+warning:17:24:XHP25:Spaces Inside Parentheses
+warning:19:10:XHP25:Spaces Inside Parentheses
+warning:19:25:XHP25:Spaces Inside Parentheses
 ~~~~~~~~~~
 <?php
 
 if ($x) {}
 f();
 q();
 g();
 if ($x) {} else if ($y) {}
 
 $obj->m(
   $x,
   $y,
   $z);
 for ($ii = 0; $ii < 1; $ii++) {}
 foreach ($x as $y) {}
 function q($x) {}
 final class X {
   public function f($y) {}
 }
 foreach ($z as $k => $v) {}
 some_call( /* respect authorial intent */ $b,
   $a // if comments are present
   );
diff --git a/src/lint/linter/xhpast/rules/__tests__/parse_str-use/parse_str-use.lint-test b/src/lint/linter/xhpast/rules/__tests__/parse_str-use/parse_str-use.lint-test
index 21afe525..0e7541d6 100644
--- a/src/lint/linter/xhpast/rules/__tests__/parse_str-use/parse_str-use.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/parse_str-use/parse_str-use.lint-test
@@ -1,7 +1,7 @@
 <?php
 
 $params = array();
 parse_str('foo=bar', $params);
 parse_str('foo=bar');
 ~~~~~~~~~~
-error:5:1
+error:5:1:XHP80:Questionable Use of `parse_str`
diff --git a/src/lint/linter/xhpast/rules/__tests__/php-close-tag/php-close-tag.lint-test b/src/lint/linter/xhpast/rules/__tests__/php-close-tag/php-close-tag.lint-test
index 54fb1fc5..2a7ec0a4 100644
--- a/src/lint/linter/xhpast/rules/__tests__/php-close-tag/php-close-tag.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/php-close-tag/php-close-tag.lint-test
@@ -1,5 +1,5 @@
 <?php
 return;
 ?>
 ~~~~~~~~~~
-error:3:1
+error:3:1:XHP8:Use of Close Tag `?>`
diff --git a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/conditional-usage.lint-test b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/conditional-usage.lint-test
index 6b8a50de..ba34f703 100644
--- a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/conditional-usage.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/conditional-usage.lint-test
@@ -1,32 +1,32 @@
 <?php
 
 if (function_exists('array_column')) {
   array_column(array(), '');
   json_last_error_msg();
 } else {
   array_column(array(), '');
 }
 
 if (class_exists('CURLFile')) {
   new CURLFile('');
   new DateTimeImmutable();
 }
 
 if (function_exists('json_last_error_msg'))
   json_last_error_msg();
 
 // These shouldn't fatal.
 if (SomeClass::someStaticMethod($param)) {}
 $var = 'some_func';
 if ($var()) {}
 ~~~~~~~~~~
-error:5:3
-error:7:3
-error:12:7
+error:5:3:XHP45:PHP Compatibility
+error:7:3:XHP45:PHP Compatibility
+error:12:7:XHP45:PHP Compatibility
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.php-version": "5.3.0"
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/index-function.lint-test b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/index-function.lint-test
index fd7b02a2..83d0e3b2 100644
--- a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/index-function.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/index-function.lint-test
@@ -1,12 +1,12 @@
 <?php
 
 f()[0];
 ~~~~~~~~~~
-error:3:5
+error:3:5:XHP45:PHP Compatibility
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.php-version": "5.3.0"
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/nowdoc.lint-test b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/nowdoc.lint-test
index 74e25ddc..7895253f 100644
--- a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/nowdoc.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/nowdoc.lint-test
@@ -1,14 +1,14 @@
 <?php
 
 echo <<<'EOT'
 Hello World!
 EOT;
 ~~~~~~~~~~
-error:3:6
+error:3:6:XHP45:PHP Compatibility
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.php-version": "5.2.3"
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php-compatibility.lint-test b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php-compatibility.lint-test
index 93ef1aa7..117d2405 100644
--- a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php-compatibility.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php-compatibility.lint-test
@@ -1,14 +1,14 @@
 <?php
 
 define_syslog_variables();
 var_dump(STREAM_ENFORCE_SAFE_MODE);
 ~~~~~~~~~~
-error:3:1
-error:4:10
+error:3:1:XHP45:PHP Compatibility
+error:4:10:XHP45:PHP Compatibility
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.php-version": "5.4.0"
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php53-features.lint-test b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php53-features.lint-test
index a867aeab..935e2f21 100644
--- a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php53-features.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php53-features.lint-test
@@ -1,27 +1,27 @@
 <?php
 
 namespace a;
 use b, c;
 f(function () {});
 g(function () use ($c) {});
 static::m();
 1 ? 1 : 2;
 1 ?: 2;
 $a = 'stdClass';
 $a::m();
 echo __DIR__;
 ~~~~~~~~~~
-error:3:1
-error:4:1
-error:5:3
-error:6:3
-error:7:1
-error:9:1
-error:12:6
+error:3:1:XHP45:PHP Compatibility
+error:4:1:XHP45:PHP Compatibility
+error:5:3:XHP45:PHP Compatibility
+error:6:3:XHP45:PHP Compatibility
+error:7:1:XHP45:PHP Compatibility
+error:9:1:XHP45:PHP Compatibility
+error:12:6:XHP45:PHP Compatibility
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.php-version": "5.2.3"
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php54-features.lint-test b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php54-features.lint-test
index d7d6a768..292b8ea0 100644
--- a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php54-features.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php54-features.lint-test
@@ -1,40 +1,40 @@
 <?php
 
 f()[0];
     m()[0];
 
 // The check above should be this, see T4334.
 // $o->m()[0];
 
 final class SomeClass extends Phobject {
   public function someMethod() {
     return function () {
       $this->someOtherMethod();
     };
   }
 
   public static function someStaticMethod() {
     return function () {
       self::someOtherMethod();
     };
   }
 }
 
 0b1;
 
 [];
 
 ~~~~~~~~~~
-error:3:5
-error:4:9
-error:12:7
-error:18:7
-error:23:1
-error:25:1
+error:3:5:XHP45:PHP Compatibility
+error:4:9:XHP45:PHP Compatibility
+error:12:7:XHP45:PHP Compatibility
+error:18:7:XHP45:PHP Compatibility
+error:23:1:XHP45:PHP Compatibility
+error:25:1:XHP45:PHP Compatibility
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.php-version": "5.3.0"
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php54-incompat.lint-test b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php54-incompat.lint-test
index fb6e3ac6..208adbfa 100644
--- a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php54-incompat.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/php54-incompat.lint-test
@@ -1,18 +1,18 @@
 <?php
 
 break;
 break 0;
 break 1;
 break 1 + foo() * $bar;
 continue;
 continue 0;
 continue 1;
 continue 1 + foo() * $bar;
 ~~~~~~~~~~
-error:4:7
-error:6:7
-error:8:10
-error:10:10
+error:4:7:XHP45:PHP Compatibility
+error:6:7:XHP45:PHP Compatibility
+error:8:10:XHP45:PHP Compatibility
+error:10:10:XHP45:PHP Compatibility
 ~~~~~~~~~~
 ~~~~~~~~~~
 {"config": {"xhpast.php-version": "5.4.0"}}
diff --git a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/windows.lint-test b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/windows.lint-test
index 3c1fece2..0323aca5 100644
--- a/src/lint/linter/xhpast/rules/__tests__/php-compatibility/windows.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/php-compatibility/windows.lint-test
@@ -1,13 +1,13 @@
 <?php
 
 chroot('/tmp');
 ~~~~~~~~~~
-error:3:1
+error:3:1:XHP45:PHP Compatibility
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.php-version": "5.2.3",
     "xhpast.php-version.windows": "5.3.0"
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/php-echo-tag/php-echo-tag.lint-test b/src/lint/linter/xhpast/rules/__tests__/php-echo-tag/php-echo-tag.lint-test
index 414db072..b86ed15e 100644
--- a/src/lint/linter/xhpast/rules/__tests__/php-echo-tag/php-echo-tag.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/php-echo-tag/php-echo-tag.lint-test
@@ -1,4 +1,4 @@
 <?=
 
 ~~~~~~~~~~
-error:1:1
+error:1:1:XHP7:Use of Echo Tag `<?=`
diff --git a/src/lint/linter/xhpast/rules/__tests__/php-open-tag/php-open-tag.lint-test b/src/lint/linter/xhpast/rules/__tests__/php-open-tag/php-open-tag.lint-test
index 7fb52e73..b3545879 100644
--- a/src/lint/linter/xhpast/rules/__tests__/php-open-tag/php-open-tag.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/php-open-tag/php-open-tag.lint-test
@@ -1,11 +1,11 @@
 garbage garbage
 <?php
 
 ?>
 ~~~~~~~~~~
-error:1:1
+error:1:1:XHP15:Expected Open Tag
 ~~~~~~~~~~
 garbage garbage
 <?php
 
 ?>
diff --git a/src/lint/linter/xhpast/rules/__tests__/php-short-tag/php-short-tag.lint-test b/src/lint/linter/xhpast/rules/__tests__/php-short-tag/php-short-tag.lint-test
index 9c5fb0c5..1e756cda 100644
--- a/src/lint/linter/xhpast/rules/__tests__/php-short-tag/php-short-tag.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/php-short-tag/php-short-tag.lint-test
@@ -1,6 +1,6 @@
 <?
 ~~~~~~~~~~
-error:1:1
+error:1:1:XHP6:Use of Short Tag `<?`
 ~~~~~~~~~~
 <?php
 
diff --git a/src/lint/linter/xhpast/rules/__tests__/plus-operator-on-strings/plus-operator-on-strings.lint-test b/src/lint/linter/xhpast/rules/__tests__/plus-operator-on-strings/plus-operator-on-strings.lint-test
index 3910c597..ff25cb5b 100644
--- a/src/lint/linter/xhpast/rules/__tests__/plus-operator-on-strings/plus-operator-on-strings.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/plus-operator-on-strings/plus-operator-on-strings.lint-test
@@ -1,10 +1,10 @@
 <?php
 
 'a'.'b';
 'a' + 'b';
 'a' + $x;
 $x + $y + $z + 'q' + 0;
 ~~~~~~~~~~
-error:4:1
-error:5:1
-error:6:1
+error:4:1:XHP21:Not String Concatenation
+error:5:1:XHP21:Not String Concatenation
+error:6:1:XHP21:Not String Concatenation
diff --git a/src/lint/linter/xhpast/rules/__tests__/preg_quote-misuse/preg_quote-misuse.lint-test b/src/lint/linter/xhpast/rules/__tests__/preg_quote-misuse/preg_quote-misuse.lint-test
index 11672af4..4df4f718 100644
--- a/src/lint/linter/xhpast/rules/__tests__/preg_quote-misuse/preg_quote-misuse.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/preg_quote-misuse/preg_quote-misuse.lint-test
@@ -1,11 +1,11 @@
 <?php
 
 function foo($bar) {
   preg_quote($bar);
   preg_quote($bar, '/');
   preg_Quote('moo');
   preg_quote('moo', '/');
 }
 ~~~~~~~~~~
-advice:4:3 Wrong number of arguments to preg_quote()
-advice:6:3 Wrong number of arguments to preg_quote()
+advice:4:3:XHP14:Misuse of `preg_quote`
+advice:6:3:XHP14:Misuse of `preg_quote`
diff --git a/src/lint/linter/xhpast/rules/__tests__/public-property/class.lint-test b/src/lint/linter/xhpast/rules/__tests__/public-property/class.lint-test
index a7921aff..0cdb9950 100644
--- a/src/lint/linter/xhpast/rules/__tests__/public-property/class.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/public-property/class.lint-test
@@ -1,9 +1,9 @@
 <?php
 
 class SomeClass {
   private $x;
   protected $y;
   public $z;
 }
 ~~~~~~~~~~
-advice:6:3
+advice:6:3:XHP130:Use of `public` Properties
diff --git a/src/lint/linter/xhpast/rules/__tests__/ragged-classtree-edge/ragged-classtree-edge.lint-test b/src/lint/linter/xhpast/rules/__tests__/ragged-classtree-edge/ragged-classtree-edge.lint-test
index facdc3b5..4c46f2ef 100644
--- a/src/lint/linter/xhpast/rules/__tests__/ragged-classtree-edge/ragged-classtree-edge.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/ragged-classtree-edge/ragged-classtree-edge.lint-test
@@ -1,12 +1,12 @@
 <?php
 
 class A extends Phobject {}
 abstract class B extends Phobject {}
 final class C extends Phobject {}
 
 /**
  * @concrete-extensible
  */
 class D extends Phobject {}
 ~~~~~~~~~~
-disabled:3:7
+disabled:3:7:XHP87:Class Not `abstract` Or `final`
diff --git a/src/lint/linter/xhpast/rules/__tests__/reused-as-iterator/reused-as-iterator.lint-test b/src/lint/linter/xhpast/rules/__tests__/reused-as-iterator/reused-as-iterator.lint-test
index 2e9c6ba4..c5a0e66f 100644
--- a/src/lint/linter/xhpast/rules/__tests__/reused-as-iterator/reused-as-iterator.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/reused-as-iterator/reused-as-iterator.lint-test
@@ -1,67 +1,67 @@
 <?php
 
 function f($stuff, $thing) {
   foreach ($stuff as $ii) {}
 
   // OK: Only reused for iteration.
 
   foreach ($stuff as $ii) {}
 }
 
 function g($stuff, $thing) {
   foreach ($stuff as $thing) {}
 
   // OK: Not reused later.
 }
 
 function h($stuff, $thing) {
 
   // OK: Used afterwards but not before.
 
   foreach ($stuff as $key => $val) {}
 
   $key = 1;
   $thing = 1;
   $thing = $key;
   $key = $thing;
 }
 
 function i($stuff, $thing) {
   foreach ($stuff as $thing) {
     $thing++;
   }
 
   // OK: Used afterwards but inside loop.
 
   foreach ($stuff as $thing) {
     $thing++;
   }
 }
 
 function j($stuff, $thing) {
 
   foreach ($stuff as $thing) {
     break;
   }
 
   // ERROR: Clobbers $thing; probably not what the author intended.
 
   f($thing);
 }
 
 function k($stuff, $thing) {
   foreach ($stuff as $thing) {
     break;
   }
 
   // ERROR: Clobbers $thing. Test case to cover some errors of implementation
   // where subsequent legitimate foreach()es threw a wrench in the gears.
 
   f($thing);
 
   $other = array();
   foreach ($other as $item) {}
 }
 ~~~~~~~~~~
-error:43:22
-error:53:22
+error:43:22:XHP32:Variable Reused As Iterator
+error:53:22:XHP32:Variable Reused As Iterator
diff --git a/src/lint/linter/xhpast/rules/__tests__/reused-iterator-reference/reused-iterator-reference.lint-test b/src/lint/linter/xhpast/rules/__tests__/reused-iterator-reference/reused-iterator-reference.lint-test
index 0bc4c345..be42a429 100644
--- a/src/lint/linter/xhpast/rules/__tests__/reused-iterator-reference/reused-iterator-reference.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/reused-iterator-reference/reused-iterator-reference.lint-test
@@ -1,130 +1,130 @@
 <?php
 
 function assign() {
   $ar = array();
   foreach ($ar as &$a) {}
   $a = 1; // Reuse of $a.
 }
 
 function expr() {
   $ar = array();
   foreach ($ar as &$a) {}
   $b = $a; // Reuse of $a.
 }
 
 function func_call() {
   $ar = array();
   foreach ($ar as &$a) {}
   $b = x($a); // Reuse of $a.
 }
 
 function x($b) {}
 
 function iterator_reuse() {
   $ar1 = array();
   $ar2 = array();
   foreach ($ar1 as &$a) {}
   foreach ($ar2 as $a) {} // Reuse of $a
 }
 
 function key_value() {
   $ar = array();
   foreach ($ar as $k => &$v) {}
   $v++; // Reuse of $v
 }
 
 function key_value2() {
   $ar = array();
   foreach ($ar as $k => $v) {}
   $v++;
 }
 
 function unset() {
   $ar = array();
   foreach ($ar as &$a) {}
   unset($a);
   $a++;
 }
 
 function unset2() {
   $ar = array();
   foreach ($ar as &$a) {}
   $a++; // Reuse of $a
   unset($a);
 }
 
 function twice_ref() {
   $ar1 = array();
   $ar2 = array();
   foreach ($ar1 as &$b) {}
   foreach ($ar2 as &$b) {}
 }
 
 function assign_ref(&$a) {
   $ar = array();
   foreach ($ar as &$b) {}
   $b = &$a;
 }
 
 function assign_ref2(&$a) {
   $ar = array();
   foreach ($ar as &$b) {}
   $b = &$a;
   $c = $b;
 }
 
 function use_inside() {
   $ar = array();
   foreach ($ar as &$a) {
     $a++;
   }
 }
 
 function variable_variable() {
   $ar = array();
   foreach ($ar as &$$a) {}
   $a++;
   $$a++;
 }
 
 function closure1() {
   $ar = array();
   foreach ($ar as &$a) {}
   function ($a) {
     $a++;
   };
 }
 
 function closure2() {
   function () {
     $ar = array();
     foreach ($ar as &$a) {}
   };
   $a++;
 }
 
 function closure3() {
   function () {
     $ar = array();
     foreach ($ar as &$a) {}
     $a++; // Reuse of $a
   };
 }
 
 function closure4() {
   $ar = array();
   foreach ($ar as &$a) {}
   function ($a) {
     unset($a);
   };
   $a++; // Reuse of $a
 }
 ~~~~~~~~~~
-warning:6:3
-warning:12:8
-warning:18:10
-warning:27:20
-warning:33:3
-warning:52:3
-warning:110:5
-warning:120:3
+warning:6:3:XHP39:Reuse of Iterator References
+warning:12:8:XHP39:Reuse of Iterator References
+warning:18:10:XHP39:Reuse of Iterator References
+warning:27:20:XHP39:Reuse of Iterator References
+warning:33:3:XHP39:Reuse of Iterator References
+warning:52:3:XHP39:Reuse of Iterator References
+warning:110:5:XHP39:Reuse of Iterator References
+warning:120:3:XHP39:Reuse of Iterator References
diff --git a/src/lint/linter/xhpast/rules/__tests__/reused-iterator/reused-iterator.lint-test b/src/lint/linter/xhpast/rules/__tests__/reused-iterator/reused-iterator.lint-test
index 29d31b72..bfe122ce 100644
--- a/src/lint/linter/xhpast/rules/__tests__/reused-iterator/reused-iterator.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/reused-iterator/reused-iterator.lint-test
@@ -1,58 +1,58 @@
 <?php
 
 for ($ii = 0; $ii < $len; $ii++) {
   foreach ($list as $ii => $jj) {
     // Reuse of $ii.
   }
 }
 
 for ($jj = 0; $jj < $len; $jj++) {
   foreach ($list as $jj) {
     // Reuse of $jj.
   }
 }
 
 for ($ii = 0; $ii < $len; $ii++) {
   foreach ($list as $ii => &$jj) {
     // Reuse of $ii.
   }
 }
 
 for ($jj = 0; $jj < $len; $jj++) {
   foreach ($list as &$jj) {
     // Reuse of $jj (by reference).
   }
 }
 
 for ($ii = 0; $ii < $len; $ii++) {
   for ($jj = 0; $jj < $len; $jj++) {
     foreach ($list as $kk) {
       // No reuse.
     }
   }
 }
 
 for ($ii = 0; $ii < $len; $ii++) {
   for ($ii = 0; $ii < $len; $ii++) {
     // Reuse of $ii, pure for loops.
   }
 }
 
 for ($ii = 0; $ii < $len; $ii++) {
   for ($jj = $ii; $jj < $jjlen; $jj++) {
     // No reuse.
   }
 }
 
 foreach ($list as $thing) {
   for ($thing = 0; $thing < $len; $thing++) {
     // Reuse of $thing, for within foreach.
   }
 }
 ~~~~~~~~~~
-error:4:11
-error:10:11
-error:16:11
-error:22:11
-error:36:7
-error:48:7
+error:4:11:XHP23:Reuse of Iterator Variable
+error:10:11:XHP23:Reuse of Iterator Variable
+error:16:11:XHP23:Reuse of Iterator Variable
+error:22:11:XHP23:Reuse of Iterator Variable
+error:36:7:XHP23:Reuse of Iterator Variable
+error:48:7:XHP23:Reuse of Iterator Variable
diff --git a/src/lint/linter/xhpast/rules/__tests__/self-class-reference/self-class-references.lint-test b/src/lint/linter/xhpast/rules/__tests__/self-class-reference/self-class-references.lint-test
index 33c30f4d..8cf29ac3 100644
--- a/src/lint/linter/xhpast/rules/__tests__/self-class-reference/self-class-references.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/self-class-reference/self-class-references.lint-test
@@ -1,37 +1,37 @@
 <?php
 
 class Foo extends Bar {
   public static function newInstance() {
     return new Foo();
   }
 
   public static function init() {
     return new self();
   }
 }
 
 $c = new class {
   public function newInstance() {
     return new self();
   }
 };
 ~~~~~~~~~~
-warning:5:16
+warning:5:16:XHP95:Self Class Reference
 ~~~~~~~~~~
 <?php
 
 class Foo extends Bar {
   public static function newInstance() {
     return new self();
   }
 
   public static function init() {
     return new self();
   }
 }
 
 $c = new class {
   public function newInstance() {
     return new self();
   }
 };
diff --git a/src/lint/linter/xhpast/rules/__tests__/self-member-reference/php54.lint-test b/src/lint/linter/xhpast/rules/__tests__/self-member-reference/php54.lint-test
index f0b46c17..9831ae14 100644
--- a/src/lint/linter/xhpast/rules/__tests__/self-member-reference/php54.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/self-member-reference/php54.lint-test
@@ -1,31 +1,31 @@
 <?php
 
 final class SomeClass extends Phobject {
   public static function someMethod() {
     $closure = function () {
       SomeClass::someOtherMethod();
       self::someOtherMethod();
     };
     $closure();
   }
 }
 ~~~~~~~~~~
-warning:6:7
+warning:6:7:XHP57:Self Member Reference
 ~~~~~~~~~~
 <?php
 
 final class SomeClass extends Phobject {
   public static function someMethod() {
     $closure = function () {
       self::someOtherMethod();
       self::someOtherMethod();
     };
     $closure();
   }
 }
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.php-version": "5.4.0"
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/self-member-reference/self-member-reference.lint-test b/src/lint/linter/xhpast/rules/__tests__/self-member-reference/self-member-reference.lint-test
index 5aef8974..ee9961bd 100644
--- a/src/lint/linter/xhpast/rules/__tests__/self-member-reference/self-member-reference.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/self-member-reference/self-member-reference.lint-test
@@ -1,23 +1,23 @@
 <?php
 
 class Foo extends Bar {
   const FOOBAR = 'FOOBAR';
 
   public function baz() {
     echo Foo::FOOBAR;
     echo self::FOOBAR;
   }
 }
 ~~~~~~~~~~
-warning:7:10
+warning:7:10:XHP57:Self Member Reference
 ~~~~~~~~~~
 <?php
 
 class Foo extends Bar {
   const FOOBAR = 'FOOBAR';
 
   public function baz() {
     echo self::FOOBAR;
     echo self::FOOBAR;
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/semicolon-spacing/semicolon-spacing.lint-test b/src/lint/linter/xhpast/rules/__tests__/semicolon-spacing/semicolon-spacing.lint-test
index 64052864..16091019 100644
--- a/src/lint/linter/xhpast/rules/__tests__/semicolon-spacing/semicolon-spacing.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/semicolon-spacing/semicolon-spacing.lint-test
@@ -1,16 +1,16 @@
 <?php
 
 foo();
 bar() ;
 baz()
 
      ;
 ~~~~~~~~~~
-advice:4:6
-advice:5:6
+advice:4:6:XHP43:Semicolon Spacing
+advice:5:6:XHP43:Semicolon Spacing
 ~~~~~~~~~~
 <?php
 
 foo();
 bar();
 baz();
diff --git a/src/lint/linter/xhpast/rules/__tests__/slowness/slowness.lint-test b/src/lint/linter/xhpast/rules/__tests__/slowness/slowness.lint-test
index 6549eca3..13361ef5 100644
--- a/src/lint/linter/xhpast/rules/__tests__/slowness/slowness.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/slowness/slowness.lint-test
@@ -1,14 +1,14 @@
 <?php
 
 (strpos('a', 'b') === 0);
 (strpos('a', 'b') !== 0);
 (0 === strpos('a', 'b'));
 (1 + 0 === strpos('a', 'b'));
 
 (strstr('a', 'b') === false);
 (strstr('a', 'b') === 'b');
 ~~~~~~~~~~
-warning:3:2
-warning:4:2
-warning:5:8
-warning:8:2
+warning:3:2:XHP36:Slow Construct
+warning:4:2:XHP36:Slow Construct
+warning:5:8:XHP36:Slow Construct
+warning:8:2:XHP36:Slow Construct
diff --git a/src/lint/linter/xhpast/rules/__tests__/static-this/static-this.lint-test b/src/lint/linter/xhpast/rules/__tests__/static-this/static-this.lint-test
index 0eb809da..6c15bb04 100644
--- a/src/lint/linter/xhpast/rules/__tests__/static-this/static-this.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/static-this/static-this.lint-test
@@ -1,12 +1,12 @@
 <?php
 
 final class A {
   public function u() {
     $this->f();
   }
   public static function v() {
     $this->f();
   }
 }
 ~~~~~~~~~~
-error:8:5
+error:8:5:XHP13:Use of `$this` in Static Context
diff --git a/src/lint/linter/xhpast/rules/__tests__/tautological-expression/tautological-expression.lint-test b/src/lint/linter/xhpast/rules/__tests__/tautological-expression/tautological-expression.lint-test
index fa1a7d8e..c9200a3a 100644
--- a/src/lint/linter/xhpast/rules/__tests__/tautological-expression/tautological-expression.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/tautological-expression/tautological-expression.lint-test
@@ -1,23 +1,23 @@
 <?php
 
 if ($x == $x) {}
 
 if ($x->m(3) < $x->m(3)) {}
 
 if ($y[2] - $y[2]) {}
 
 if ($x == $y) {}
 
 // See xhpast 0.54 -> 0.55.
 return $a->sub->value < $b->sub->value;
 
 $skip_cache = true || $some_complicated_expression;
 $skip_cache = $a || $b;
 $skip_cache = false && something();
 $skip_cache = f();
 ~~~~~~~~~~
-error:3:5
-error:5:5
-error:7:5
-error:14:15
-error:16:15
+error:3:5:XHP20:Tautological Expression
+error:5:5:XHP20:Tautological Expression
+error:7:5:XHP20:Tautological Expression
+error:14:15:XHP20:Tautological Expression
+error:16:15:XHP20:Tautological Expression
diff --git a/src/lint/linter/xhpast/rules/__tests__/this-reassignment/class.lint-test b/src/lint/linter/xhpast/rules/__tests__/this-reassignment/class.lint-test
index e4081b0d..a6c96f18 100644
--- a/src/lint/linter/xhpast/rules/__tests__/this-reassignment/class.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/this-reassignment/class.lint-test
@@ -1,8 +1,8 @@
 <?php
 class SomeClass {
   public function __construct() {
     $this = null;
   }
 }
 ~~~~~~~~~~
-error:4:5
+error:4:5:XHP91:`$this` Reassignment
diff --git a/src/lint/linter/xhpast/rules/__tests__/this-reassignment/this.lint-test b/src/lint/linter/xhpast/rules/__tests__/this-reassignment/this.lint-test
index 0a0d38f5..6a3c2ade 100644
--- a/src/lint/linter/xhpast/rules/__tests__/this-reassignment/this.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/this-reassignment/this.lint-test
@@ -1,4 +1,4 @@
 <?php
 $this = null;
 ~~~~~~~~~~
-error:2:1
+error:2:1:XHP91:`$this` Reassignment
diff --git a/src/lint/linter/xhpast/rules/__tests__/todo-comment/todo-comment.lint-test b/src/lint/linter/xhpast/rules/__tests__/todo-comment/todo-comment.lint-test
index 4e7be6dd..ecda219e 100644
--- a/src/lint/linter/xhpast/rules/__tests__/todo-comment/todo-comment.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/todo-comment/todo-comment.lint-test
@@ -1,10 +1,10 @@
 <?php
 
 // TODO: Something goes here.
 
 /**
  * @todo Something else goes here.
  */
 ~~~~~~~~~~
-disabled:3:4
-disabled:6:4
+disabled:3:4:XHP16:TODO Comment
+disabled:6:4:XHP16:TODO Comment
diff --git a/src/lint/linter/xhpast/rules/__tests__/unary-postfix-expression-spacing/unary-postfix-expression-spacing.lint-test b/src/lint/linter/xhpast/rules/__tests__/unary-postfix-expression-spacing/unary-postfix-expression-spacing.lint-test
index d8cd5c24..c102c83c 100644
--- a/src/lint/linter/xhpast/rules/__tests__/unary-postfix-expression-spacing/unary-postfix-expression-spacing.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/unary-postfix-expression-spacing/unary-postfix-expression-spacing.lint-test
@@ -1,11 +1,11 @@
 <?php
 
 $x ++;
 $y--;
 ~~~~~~~~~~
-warning:3:3
+warning:3:3:XHP75:Space Before Unary Postfix Operator
 ~~~~~~~~~~
 <?php
 
 $x++;
 $y--;
diff --git a/src/lint/linter/xhpast/rules/__tests__/unary-prefix-expression-spacing/unary-prefix-expression-spacing.lint-test b/src/lint/linter/xhpast/rules/__tests__/unary-prefix-expression-spacing/unary-prefix-expression-spacing.lint-test
index e30bbe0e..f1080013 100644
--- a/src/lint/linter/xhpast/rules/__tests__/unary-prefix-expression-spacing/unary-prefix-expression-spacing.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/unary-prefix-expression-spacing/unary-prefix-expression-spacing.lint-test
@@ -1,14 +1,14 @@
 <?php
 
 $f = @ fopen($path, 'rb');
 @fclose($f);
 exit ();
 ~~~~~~~~~~
-warning:3:7
-warning:5:5
+warning:3:7:XHP73:Space After Unary Prefix Operator
+warning:5:5:XHP73:Space After Unary Prefix Operator
 ~~~~~~~~~~
 <?php
 
 $f = @fopen($path, 'rb');
 @fclose($f);
 exit();
diff --git a/src/lint/linter/xhpast/rules/__tests__/undeclared-variable/undeclared-variable.lint-test b/src/lint/linter/xhpast/rules/__tests__/undeclared-variable/undeclared-variable.lint-test
index c0447504..6ec0020b 100644
--- a/src/lint/linter/xhpast/rules/__tests__/undeclared-variable/undeclared-variable.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/undeclared-variable/undeclared-variable.lint-test
@@ -1,204 +1,204 @@
 <?php
 
 function () use ($c) {
   $c++;
 };
 
 function f($a, $b) {
   static $c, $d;
   global $e, $f;
   $g = $h = x();
   list($i, list($j, $k)) = y();
   foreach (q() as $l => $m) {}
 
   $a++;
   $b++;
   $c++;
   $d++;
   $e++;
   $f++;
   $g++;
   $h++;
   $i++;
   $j++;
   $k++;
   $l++;
   $m++;
   $this++;
   $n++; // Only one that isn't declared.
 
   extract(z());
 
   $o++;
 }
 
 function g($q) {
   $$q = x();
   $r = y();
 }
 
 final class C {
   public function m() {
     $a++;
     x($b);
     $c[] = 3;
     $d->v = 4;
     $a = $f;
   }
 }
 
 function worst() {
   global $$x;
   $y++;
 }
 
 function superglobals() {
   $GLOBALS[$_FILES[$_POST[$this]]]++;
 }
 
 function ref_foreach($x) {
   foreach ($x as &$z) {}
   $z++;
 }
 
 function has_default($x = 0) {
   $x++;
 }
 
 function declparse(
   $a,
   Q $b,
   Q &$c,
   Q $d = null,
   Q &$e = null,
   $f = null,
   $g = null,
   &$h = null,
   &$i = null) {
   $a++;
   $b++;
   $c++;
   $d++;
   $e++;
   $f++;
   $g++;
   $h++;
   $i++;
   $j++;
 }
 
 function declparse_a(Q $a) { $a++; }
 function declparse_b(Q &$a) { $a++; }
 function declparse_c(Q $a = null) { $a++; }
 function declparse_d(Q &$a = null) { $a++; }
 function declparse_e($a) { $a++; }
 function declparse_f(&$a) { $a++; }
 function declparse_g($a = null) { $a++; }
 function declparse_h(&$a = null) { $a++; }
 
 function static_class() {
   SomeClass::$x;
 }
 
 function instance_class() {
   $a = $this->$x;
 }
 
 function exception_vars() {
   try {
     // This is intentionally left blank.
   } catch (Exception $y) {
     $y++;
   }
 }
 
 function nonuse() {
   isset($x);
   empty($y);
   $x++;
 }
 
 function twice() {
   $y++;
   $y++;
 }
 
 function more_exceptions() {
   try {
     // This is intentionally left blank.
 } catch (Exception $a) {
     $a++;
   } catch (Exception $b) {
     $b++;
   }
 }
 
 abstract class P {
   abstract public function q();
 }
 
 function x() {
   $lib = $_SERVER['PHP_ROOT'].'/lib/titan/display/read/init.php';
   require_once $lib;
   f(((($lib)))); // Tests for paren expressions.
   f(((($lub))));
 }
 
 final class A {
   public function foo($a) {
     $im_service = foo($a);
     if ($im_servce === false) {
       return 1;
     }
     return 2;
   }
 }
 
 function arrow($o, $x) {
   echo $o->{$x->{$x->{$x.$x->{$x}}.$x}};
 }
 
 function strings() {
   $a = 1;
   echo "$a";
   echo "$b";
 }
 
 function catchy() {
   try {
     dangerous();
   } catch (Exception $ex) {
     $y->z();
   }
 }
 
 function some_func($x, $y) {
   $func = function ($z) use ($x) {
     echo $x;
     echo $y;
     echo $z;
   };
 }
 
 function some_func($x, $y) {
   $func = function ($z) use ($x) {
     echo "$x/$y/$z";
   };
 }
 ~~~~~~~~~~
-error:28:3
-error:42:5
-error:43:7
-error:44:5
-error:45:5
-error:46:10
-error:87:3 This stuff is basically testing the lexer/parser for function decls.
-error:104:15 Variables in instance derefs should be checked, static should not.
-error:118:3 isset() and empty() should not trigger errors.
-error:122:3 Should only warn once in this function.
-error:144:8
-error:150:9
-error:164:9
-error:171:5
-error:178:10
-error:185:14
+error:28:3:XHP5:Use of Undeclared Variable
+error:42:5:XHP5:Use of Undeclared Variable
+error:43:7:XHP5:Use of Undeclared Variable
+error:44:5:XHP5:Use of Undeclared Variable
+error:45:5:XHP5:Use of Undeclared Variable
+error:46:10:XHP5:Use of Undeclared Variable
+error:87:3:XHP5:Use of Undeclared Variable
+error:104:15:XHP5:Use of Undeclared Variable
+error:118:3:XHP5:Use of Undeclared Variable
+error:122:3:XHP5:Use of Undeclared Variable
+error:144:8:XHP5:Use of Undeclared Variable
+error:150:9:XHP5:Use of Undeclared Variable
+error:164:9:XHP5:Use of Undeclared Variable
+error:171:5:XHP5:Use of Undeclared Variable
+error:178:10:XHP5:Use of Undeclared Variable
+error:185:14:XHP5:Use of Undeclared Variable
diff --git a/src/lint/linter/xhpast/rules/__tests__/unexpected-return-value/construct.lint-test b/src/lint/linter/xhpast/rules/__tests__/unexpected-return-value/construct.lint-test
index 894c3f6b..e1173e7d 100644
--- a/src/lint/linter/xhpast/rules/__tests__/unexpected-return-value/construct.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/unexpected-return-value/construct.lint-test
@@ -1,8 +1,8 @@
 <?php
 class SomeClass {
   public function __construct() {
     return null;
   }
 }
 ~~~~~~~~~~
-warning:4:5
+warning:4:5:XHP92:Unexpected `return` Value
diff --git a/src/lint/linter/xhpast/rules/__tests__/unexpected-return-value/destruct.lint-test b/src/lint/linter/xhpast/rules/__tests__/unexpected-return-value/destruct.lint-test
index 5b9d7bf6..7c7a4ed7 100644
--- a/src/lint/linter/xhpast/rules/__tests__/unexpected-return-value/destruct.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/unexpected-return-value/destruct.lint-test
@@ -1,8 +1,8 @@
 <?php
 class SomeClass {
   public function __destruct() {
     return null;
   }
 }
 ~~~~~~~~~~
-warning:4:5
+warning:4:5:XHP92:Unexpected `return` Value
diff --git a/src/lint/linter/xhpast/rules/__tests__/unnecessary-final-modifier/unnecessary-final-modifier.lint-test b/src/lint/linter/xhpast/rules/__tests__/unnecessary-final-modifier/unnecessary-final-modifier.lint-test
index 0859d5ab..97fb51e4 100644
--- a/src/lint/linter/xhpast/rules/__tests__/unnecessary-final-modifier/unnecessary-final-modifier.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/unnecessary-final-modifier/unnecessary-final-modifier.lint-test
@@ -1,9 +1,9 @@
 <?php
 
 final class Foo {
   public function bar() {}
   final public function baz() {}
 }
 $c = new class {};
 ~~~~~~~~~~
-advice:5:3
+advice:5:3:XHP55:Unnecessary Final Modifier
diff --git a/src/lint/linter/xhpast/rules/__tests__/unnecessary-symbol-alias/use.lint-test b/src/lint/linter/xhpast/rules/__tests__/unnecessary-symbol-alias/use.lint-test
index a9a25d5c..5aab6a87 100644
--- a/src/lint/linter/xhpast/rules/__tests__/unnecessary-symbol-alias/use.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/unnecessary-symbol-alias/use.lint-test
@@ -1,16 +1,16 @@
 <?php
 use A;
 use B as B;
 use C as D;
 use E\F as F;
 use G\H as I;
 ~~~~~~~~~~
-warning:3:5
-warning:5:5
+warning:3:5:XHP99:Unnecessary Symbol Alias
+warning:5:5:XHP99:Unnecessary Symbol Alias
 ~~~~~~~~~~
 <?php
 use A;
 use B;
 use C as D;
 use E\F;
 use G\H as I;
diff --git a/src/lint/linter/xhpast/rules/__tests__/unsafe-dynamic-string/pht.lint-test b/src/lint/linter/xhpast/rules/__tests__/unsafe-dynamic-string/pht.lint-test
index 3a4b0c34..6bd6ae5e 100644
--- a/src/lint/linter/xhpast/rules/__tests__/unsafe-dynamic-string/pht.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/unsafe-dynamic-string/pht.lint-test
@@ -1,37 +1,37 @@
 <?php
 
 pht('a');
 pht("a");
 pht('a'.'b');
 pht(f());
 pht();
 pht($a);
 pht('a'.$a);
 pht('$a');
 pht("$a");
 pht('%s', $a);
 
 pht(<<<EOT
 a
 EOT
 );
 
 pht(<<<EOT
 $a
 EOT
 );
 ~~~~~~~~~~
-error:6:1
-error:8:1
-error:9:1
-error:11:1
-error:19:1
+error:6:1:XHP86:Unsafe Usage of Dynamic String
+error:8:1:XHP86:Unsafe Usage of Dynamic String
+error:9:1:XHP86:Unsafe Usage of Dynamic String
+error:11:1:XHP86:Unsafe Usage of Dynamic String
+error:19:1:XHP86:Unsafe Usage of Dynamic String
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.dynamic-string.functions": {
       "pht": 0
     }
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/unsafe-dynamic-string/xsprintf.lint-test b/src/lint/linter/xhpast/rules/__tests__/unsafe-dynamic-string/xsprintf.lint-test
index b4344fe3..dc5d8edc 100644
--- a/src/lint/linter/xhpast/rules/__tests__/unsafe-dynamic-string/xsprintf.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/unsafe-dynamic-string/xsprintf.lint-test
@@ -1,15 +1,15 @@
 <?php
 
 csprintf('x');
 csprintf($x);
 ~~~~~~~~~~
-error:4:1
+error:4:1:XHP86:Unsafe Usage of Dynamic String
 ~~~~~~~~~~
 ~~~~~~~~~~
 {
   "config": {
     "xhpast.dynamic-string.functions": {
       "csprintf": 0
     }
   }
 }
diff --git a/src/lint/linter/xhpast/rules/__tests__/use-statement-namespace-prefix/use.lint-test b/src/lint/linter/xhpast/rules/__tests__/use-statement-namespace-prefix/use.lint-test
index d4d7e63b..b90281ce 100644
--- a/src/lint/linter/xhpast/rules/__tests__/use-statement-namespace-prefix/use.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/use-statement-namespace-prefix/use.lint-test
@@ -1,11 +1,11 @@
 <?php
 namespace SomeNamespace;
 use X\Y\Z;
 use \X\Y\Z;
 ~~~~~~~~~~
-warning:4:5
+warning:4:5:XHP97:`use` Statement Namespace Prefix
 ~~~~~~~~~~
 <?php
 namespace SomeNamespace;
 use X\Y\Z;
 use X\Y\Z;
diff --git a/src/lint/linter/xhpast/rules/__tests__/useless-overriding-method/useless-overriding-method.lint-test b/src/lint/linter/xhpast/rules/__tests__/useless-overriding-method/useless-overriding-method.lint-test
index 3132c00a..4486c5bb 100644
--- a/src/lint/linter/xhpast/rules/__tests__/useless-overriding-method/useless-overriding-method.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/useless-overriding-method/useless-overriding-method.lint-test
@@ -1,27 +1,27 @@
 <?php
 
 final class MyClass extends SomeOtherClass {
   public function __construct() {
     parent::__construct();
   }
 
   public function uselessMethod($x, array $y) {
     return parent::uselessMethod($x, $y);
   }
 
   public function usefulMethod($x, array $y) {
     return parent::usefulMethod($x, null);
   }
 
   public function anotherMethod($x, &$y) {
     return parent::anotherMethod($x, $y);
   }
 
   public function usefulMethodWithDefaultValue($x = null) {
     return parent::usefulMethodWithDefaultValue($x);
   }
 }
 ~~~~~~~~~~
-advice:4:3
-advice:8:3
-advice:16:3
+advice:4:3:XHP63:Useless Overriding Method
+advice:8:3:XHP63:Useless Overriding Method
+advice:16:3:XHP63:Useless Overriding Method
diff --git a/src/lint/linter/xhpast/rules/__tests__/variable-reference-spacing/function-call.lint-test b/src/lint/linter/xhpast/rules/__tests__/variable-reference-spacing/function-call.lint-test
index 35418dd6..ac26a70c 100644
--- a/src/lint/linter/xhpast/rules/__tests__/variable-reference-spacing/function-call.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/variable-reference-spacing/function-call.lint-test
@@ -1,13 +1,13 @@
 <?php
 $x = &some_function();
 $x = & some_function();
 $x = &
         some_function();
 ~~~~~~~~~~
-warning:3:7
-warning:4:7
+warning:3:7:XHP123:Variable Reference Spacing
+warning:4:7:XHP123:Variable Reference Spacing
 ~~~~~~~~~~
 <?php
 $x = &some_function();
 $x = &some_function();
 $x = &some_function();
diff --git a/src/lint/linter/xhpast/rules/__tests__/variable-reference-spacing/variable.lint-test b/src/lint/linter/xhpast/rules/__tests__/variable-reference-spacing/variable.lint-test
index f3eff1da..eea2fbc5 100644
--- a/src/lint/linter/xhpast/rules/__tests__/variable-reference-spacing/variable.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/variable-reference-spacing/variable.lint-test
@@ -1,13 +1,13 @@
 <?php
 $x = &$a;
 $x = & $b;
 $x = &
         $c;
 ~~~~~~~~~~
-warning:3:7
-warning:4:7
+warning:3:7:XHP123:Variable Reference Spacing
+warning:4:7:XHP123:Variable Reference Spacing
 ~~~~~~~~~~
 <?php
 $x = &$a;
 $x = &$b;
 $x = &$c;
diff --git a/src/lint/linter/xhpast/rules/__tests__/variable-variable/variable-variables.lint-test b/src/lint/linter/xhpast/rules/__tests__/variable-variable/variable-variables.lint-test
index 60c06632..be083d1a 100644
--- a/src/lint/linter/xhpast/rules/__tests__/variable-variable/variable-variables.lint-test
+++ b/src/lint/linter/xhpast/rules/__tests__/variable-variable/variable-variables.lint-test
@@ -1,6 +1,6 @@
 <?php
 
 $$foo;
 $obj->$bar; // okay
 ~~~~~~~~~~
-error:3:1
+error:3:1:XHP3:Use of Variable
diff --git a/src/workflow/ArcanistLandWorkflow.php b/src/workflow/ArcanistLandWorkflow.php
index 7ca0028e..28edf0f0 100644
--- a/src/workflow/ArcanistLandWorkflow.php
+++ b/src/workflow/ArcanistLandWorkflow.php
@@ -1,1681 +1,1708 @@
 <?php
 
 /**
  * Lands a branch by rebasing, merging and amending it.
  */
 final class ArcanistLandWorkflow extends ArcanistWorkflow {
 
   private $isGit;
   private $isGitSvn;
   private $isHg;
   private $isHgSvn;
 
   private $oldBranch;
   private $branch;
   private $onto;
   private $ontoRemoteBranch;
   private $remote;
   private $useSquash;
   private $keepBranch;
   private $branchType;
   private $ontoType;
   private $preview;
 
   private $revision;
   private $messageFile;
 
   const REFTYPE_BRANCH = 'branch';
   const REFTYPE_BOOKMARK = 'bookmark';
 
   public function getRevisionDict() {
     return $this->revision;
   }
 
   public function getWorkflowName() {
     return 'land';
   }
 
   public function getCommandSynopses() {
     return phutil_console_format(<<<EOTEXT
       **land** [__options__] [__ref__]
 EOTEXT
       );
   }
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
           Supports: git, hg
 
           Publish an accepted revision after review. This command is the last
           step in the standard Differential pre-publish code review workflow.
 
           This command merges and pushes changes associated with an accepted
           revision that are currently sitting in __ref__, which is usually the
           name of a local branch. Without __ref__, the current working copy
           state will be used.
 
           Under Git: branches, tags, and arbitrary commits (detached HEADs)
           may be landed.
 
           Under Mercurial: branches and bookmarks may be landed, but only
           onto a target of the same type. See T3855.
 
           The workflow selects a target branch to land onto and a remote where
           the change will be pushed to.
 
           A target branch is selected by examining these sources in order:
 
             - the **--onto** flag;
             - the upstream of the current branch, recursively (Git only);
             - the __arc.land.onto.default__ configuration setting;
             - or by falling back to a standard default:
               - "master" in Git;
               - "default" in Mercurial.
 
           A remote is selected by examining these sources in order:
 
             - the **--remote** flag;
             - the upstream of the current branch, recursively (Git only);
             - or by falling back to a standard default:
               - "origin" in Git;
               - the default remote in Mercurial.
 
           After selecting a target branch and a remote, the commits which will
           be landed are printed.
 
           With **--preview**, execution stops here, before the change is
           merged.
 
           The change is merged with the changes in the target branch,
           following these rules:
 
           In repositories with mutable history or with **--squash**, this will
           perform a squash merge (the entire branch will be represented as one
           commit after the merge).
 
           In repositories with immutable history or with **--merge**, this will
           perform a strict merge (a merge commit will always be created, and
           local commits will be preserved).
 
           The resulting commit will be given an up-to-date commit message
           describing the final state of the revision in Differential.
 
           In Git, the merge occurs in a detached HEAD. The local branch
           reference (if one exists) is not updated yet.
 
           With **--hold**, execution stops here, before the change is pushed.
 
           The change is pushed into the remote.
 
           Consulting mystical sources of power, the workflow makes a guess
           about what state you wanted to end up in after the process finishes
           and the working copy is put into that state.
 
           The branch which was landed is deleted, unless the **--keep-branch**
           flag was passed or the landing branch is the same as the target
           branch.
 
 EOTEXT
       );
   }
 
   public function requiresWorkingCopy() {
     return true;
   }
 
   public function requiresConduit() {
     return true;
   }
 
   public function requiresAuthentication() {
     return true;
   }
 
   public function requiresRepositoryAPI() {
     return true;
   }
 
   public function getArguments() {
     return array(
       'onto' => array(
         'param' => 'master',
         'help' => pht(
           "Land feature branch onto a branch other than the default ".
           "('master' in git, 'default' in hg). You can change the default ".
           "by setting '%s' with `%s` or for the entire project in %s.",
           'arc.land.onto.default',
           'arc set-config',
           '.arcconfig'),
       ),
       'hold' => array(
         'help' => pht(
           'Prepare the change to be pushed, but do not actually push it.'),
       ),
       'keep-branch' => array(
         'help' => pht(
           'Keep the feature branch after pushing changes to the '.
           'remote (by default, it is deleted).'),
       ),
       'remote' => array(
         'param' => 'origin',
         'help' => pht(
           "Push to a remote other than the default ('origin' in git)."),
       ),
       'merge' => array(
         'help' => pht(
           'Perform a %s merge, not a %s merge. If the project '.
           'is marked as having an immutable history, this is the default '.
           'behavior.',
           '--no-ff',
           '--squash'),
         'supports' => array(
           'git',
         ),
         'nosupport'   => array(
           'hg' => pht(
             'Use the %s strategy when landing in mercurial.',
             '--squash'),
         ),
       ),
       'squash' => array(
         'help' => pht(
           'Perform a %s merge, not a %s merge. If the project is '.
           'marked as having a mutable history, this is the default behavior.',
           '--squash',
           '--no-ff'),
         'conflicts' => array(
           'merge' => pht(
             '%s and %s are conflicting merge strategies.',
             '--merge',
             '--squash'),
         ),
       ),
       'delete-remote' => array(
         'help' => pht(
           'Delete the feature branch in the remote after landing it.'),
         'conflicts' => array(
           'keep-branch' => true,
         ),
         'supports' => array(
           'hg',
         ),
       ),
       'revision' => array(
         'param' => 'id',
         'help' => pht(
           'Use the message from a specific revision, rather than '.
           'inferring the revision based on branch content.'),
       ),
       'preview' => array(
         'help' => pht(
           'Prints the commits that would be landed. Does not '.
           'actually modify or land the commits.'),
       ),
       '*' => 'branch',
     );
   }
 
   public function run() {
     $this->readArguments();
 
     $engine = null;
     if ($this->isGit && !$this->isGitSvn) {
       $engine = new ArcanistGitLandEngine();
     }
 
     if ($engine) {
       $this->readEngineArguments();
       $this->requireCleanWorkingCopy();
 
       $should_hold = $this->getArgument('hold');
 
       $engine
         ->setWorkflow($this)
         ->setRepositoryAPI($this->getRepositoryAPI())
         ->setSourceRef($this->branch)
         ->setTargetRemote($this->remote)
         ->setTargetOnto($this->onto)
         ->setShouldHold($should_hold)
         ->setShouldKeep($this->keepBranch)
         ->setShouldSquash($this->useSquash)
         ->setShouldPreview($this->preview)
         ->setBuildMessageCallback(array($this, 'buildEngineMessage'));
 
       $engine->execute();
 
       if (!$should_hold && !$this->preview) {
         $this->didPush();
       }
 
       return 0;
     }
 
     $this->validate();
 
     try {
       $this->pullFromRemote();
     } catch (Exception $ex) {
       $this->restoreBranch();
       throw $ex;
     }
 
     $this->printPendingCommits();
     if ($this->preview) {
       $this->restoreBranch();
       return 0;
     }
 
     $this->checkoutBranch();
     $this->findRevision();
 
     if ($this->useSquash) {
       $this->rebase();
       $this->squash();
     } else {
       $this->merge();
     }
 
     $this->push();
 
     if (!$this->keepBranch) {
       $this->cleanupBranch();
     }
 
     if ($this->oldBranch != $this->onto) {
       // If we were on some branch A and the user ran "arc land B",
       // switch back to A.
       if ($this->keepBranch || $this->oldBranch != $this->branch) {
         $this->restoreBranch();
       }
     }
 
     echo pht('Done.'), "\n";
 
     return 0;
   }
 
   private function getUpstreamMatching($branch, $pattern) {
     if ($this->isGit) {
       $repository_api = $this->getRepositoryAPI();
       list($err, $fullname) = $repository_api->execManualLocal(
         'rev-parse --symbolic-full-name %s@{upstream}',
         $branch);
       if (!$err) {
         $matches = null;
         if (preg_match($pattern, $fullname, $matches)) {
           return last($matches);
         }
       }
     }
     return null;
   }
 
+  private function getGitSvnTrunk() {
+    if (!$this->isGitSvn) {
+      return null;
+    }
+
+    // See T13293, this depends on the options passed when cloning.
+    // On any error we return `trunk`, which was the previous default.
+
+    $repository_api = $this->getRepositoryAPI();
+    list($err, $refspec) = $repository_api->execManualLocal(
+      'config svn-remote.svn.fetch');
+
+    if ($err) {
+      return 'trunk';
+    }
+
+    $refspec = rtrim(substr($refspec, strrpos($refspec, ':') + 1));
+
+    $prefix = 'refs/remotes/';
+    if (substr($refspec, 0, strlen($prefix)) !== $prefix) {
+      return 'trunk';
+    }
+
+    $refspec = substr($refspec, strlen($prefix));
+    return $refspec;
+  }
+
   private function readEngineArguments() {
     // NOTE: This is hard-coded for Git right now.
     // TODO: Clean this up and move it into LandEngines.
 
     $onto = $this->getEngineOnto();
     $remote = $this->getEngineRemote();
 
     // This just overwrites work we did earlier, but it has to be up in this
     // class for now because other parts of the workflow still depend on it.
     $this->onto = $onto;
     $this->remote = $remote;
     $this->ontoRemoteBranch = $this->remote.'/'.$onto;
   }
 
   private function getEngineOnto() {
     $onto = $this->getArgument('onto');
     if ($onto !== null) {
       $this->writeInfo(
         pht('TARGET'),
         pht(
           'Landing onto "%s", selected by the --onto flag.',
           $onto));
       return $onto;
     }
 
     $api = $this->getRepositoryAPI();
     $path = $api->getPathToUpstream($this->branch);
 
     if ($path->getLength()) {
       $cycle = $path->getCycle();
       if ($cycle) {
         $this->writeWarn(
           pht('LOCAL CYCLE'),
           pht(
             'Local branch tracks an upstream, but following it leads to a '.
             'local cycle; ignoring branch upstream.'));
 
         echo tsprintf(
           "\n    %s\n\n",
           implode(' -> ', $cycle));
 
       } else {
         if ($path->isConnectedToRemote()) {
           $onto = $path->getRemoteBranchName();
           $this->writeInfo(
             pht('TARGET'),
             pht(
               'Landing onto "%s", selected by following tracking branches '.
               'upstream to the closest remote.',
               $onto));
           return $onto;
         } else {
           $this->writeInfo(
             pht('NO PATH TO UPSTREAM'),
             pht(
               'Local branch tracks an upstream, but there is no path '.
               'to a remote; ignoring branch upstream.'));
         }
       }
     }
 
     $config_key = 'arc.land.onto.default';
     $onto = $this->getConfigFromAnySource($config_key);
     if ($onto !== null) {
       $this->writeInfo(
         pht('TARGET'),
         pht(
           'Landing onto "%s", selected by "%s" configuration.',
           $onto,
           $config_key));
       return $onto;
     }
 
     $onto = 'master';
     $this->writeInfo(
       pht('TARGET'),
       pht(
         'Landing onto "%s", the default target under git.',
         $onto));
     return $onto;
   }
 
   private function getEngineRemote() {
     $remote = $this->getArgument('remote');
     if ($remote !== null) {
       $this->writeInfo(
         pht('REMOTE'),
         pht(
           'Using remote "%s", selected by the --remote flag.',
           $remote));
       return $remote;
     }
 
     $api = $this->getRepositoryAPI();
     $path = $api->getPathToUpstream($this->branch);
 
     $remote = $path->getRemoteRemoteName();
     if ($remote !== null) {
       $this->writeInfo(
         pht('REMOTE'),
         pht(
           'Using remote "%s", selected by following tracking branches '.
           'upstream to the closest remote.',
           $remote));
       return $remote;
     }
 
     $remote = 'origin';
     $this->writeInfo(
       pht('REMOTE'),
       pht(
         'Using remote "%s", the default remote under git.',
         $remote));
     return $remote;
   }
 
 
   private function readArguments() {
     $repository_api = $this->getRepositoryAPI();
     $this->isGit = $repository_api instanceof ArcanistGitAPI;
     $this->isHg = $repository_api instanceof ArcanistMercurialAPI;
 
     if ($this->isGit) {
       $repository = $this->loadProjectRepository();
       $this->isGitSvn = (idx($repository, 'vcs') == 'svn');
     }
 
     if ($this->isHg) {
       $this->isHgSvn = $repository_api->isHgSubversionRepo();
     }
 
     $branch = $this->getArgument('branch');
     if (empty($branch)) {
       $branch = $this->getBranchOrBookmark();
       if ($branch !== null) {
         $this->branchType = $this->getBranchType($branch);
 
         // TODO: This message is misleading when landing a detached head or
         // a tag in Git.
 
         echo pht("Landing current %s '%s'.", $this->branchType, $branch), "\n";
         $branch = array($branch);
       }
     }
 
     if (count($branch) !== 1) {
       throw new ArcanistUsageException(
         pht('Specify exactly one branch or bookmark to land changes from.'));
     }
     $this->branch = head($branch);
     $this->keepBranch = $this->getArgument('keep-branch');
 
     $this->preview = $this->getArgument('preview');
 
     if (!$this->branchType) {
       $this->branchType = $this->getBranchType($this->branch);
     }
 
     $onto_default = $this->isGit ? 'master' : 'default';
     $onto_default = nonempty(
       $this->getConfigFromAnySource('arc.land.onto.default'),
       $onto_default);
     $onto_default = coalesce(
       $this->getUpstreamMatching($this->branch, '/^refs\/heads\/(.+)$/'),
       $onto_default);
     $this->onto = $this->getArgument('onto', $onto_default);
     $this->ontoType = $this->getBranchType($this->onto);
 
     $remote_default = $this->isGit ? 'origin' : '';
     $remote_default = coalesce(
       $this->getUpstreamMatching($this->onto, '/^refs\/remotes\/(.+?)\//'),
       $remote_default);
     $this->remote = $this->getArgument('remote', $remote_default);
 
     if ($this->getArgument('merge')) {
       $this->useSquash = false;
     } else if ($this->getArgument('squash')) {
       $this->useSquash = true;
     } else {
       $this->useSquash = !$this->isHistoryImmutable();
     }
 
     $this->ontoRemoteBranch = $this->onto;
     if ($this->isGitSvn) {
-      $this->ontoRemoteBranch = 'trunk';
+      $this->ontoRemoteBranch = $this->getGitSvnTrunk();
     } else if ($this->isGit) {
       $this->ontoRemoteBranch = $this->remote.'/'.$this->onto;
     }
 
     $this->oldBranch = $this->getBranchOrBookmark();
   }
 
   private function validate() {
     $repository_api = $this->getRepositoryAPI();
 
     if ($this->onto == $this->branch) {
       $message = pht(
         "You can not land a %s onto itself -- you are trying ".
         "to land '%s' onto '%s'. For more information on how to push ".
         "changes, see 'Pushing and Closing Revisions' in 'Arcanist User ".
         "Guide: arc diff' in the documentation.",
         $this->branchType,
         $this->branch,
         $this->onto);
       if (!$this->isHistoryImmutable()) {
         $message .= ' '.pht("You may be able to '%s' instead.", 'arc amend');
       }
       throw new ArcanistUsageException($message);
     }
 
     if ($this->isHg) {
       if ($this->useSquash) {
         if (!$repository_api->supportsRebase()) {
           throw new ArcanistUsageException(
             pht(
               'You must enable the rebase extension to use the %s strategy.',
               '--squash'));
         }
       }
 
       if ($this->branchType != $this->ontoType) {
         throw new ArcanistUsageException(pht(
           'Source %s is a %s but destination %s is a %s. When landing a '.
           '%s, the destination must also be a %s. Use %s to specify a %s, '.
           'or set %s in %s.',
           $this->branch,
           $this->branchType,
           $this->onto,
           $this->ontoType,
           $this->branchType,
           $this->branchType,
           '--onto',
           $this->branchType,
           'arc.land.onto.default',
           '.arcconfig'));
       }
     }
 
     if ($this->isGit) {
       list($err) = $repository_api->execManualLocal(
         'rev-parse --verify %s',
         $this->branch);
 
       if ($err) {
         throw new ArcanistUsageException(
           pht("Branch '%s' does not exist.", $this->branch));
       }
     }
 
     $this->requireCleanWorkingCopy();
   }
 
   private function checkoutBranch() {
     $repository_api = $this->getRepositoryAPI();
     if ($this->getBranchOrBookmark() != $this->branch) {
       $repository_api->execxLocal('checkout %s', $this->branch);
     }
 
     switch ($this->branchType) {
       case self::REFTYPE_BOOKMARK:
         $message = pht(
           'Switched to bookmark **%s**. Identifying and merging...',
           $this->branch);
         break;
       case self::REFTYPE_BRANCH:
       default:
         $message = pht(
           'Switched to branch **%s**. Identifying and merging...',
           $this->branch);
         break;
     }
 
     echo phutil_console_format($message."\n");
   }
 
   private function printPendingCommits() {
     $repository_api = $this->getRepositoryAPI();
 
     if ($repository_api instanceof ArcanistGitAPI) {
       list($out) = $repository_api->execxLocal(
         'log --oneline %s %s --',
         $this->branch,
         '^'.$this->onto);
     } else if ($repository_api instanceof ArcanistMercurialAPI) {
       $common_ancestor = $repository_api->getCanonicalRevisionName(
         hgsprintf('ancestor(%s,%s)',
           $this->onto,
           $this->branch));
 
       $branch_range = hgsprintf(
         'reverse((%s::%s) - %s)',
         $common_ancestor,
         $this->branch,
         $common_ancestor);
 
       list($out) = $repository_api->execxLocal(
         'log -r %s --template %s',
         $branch_range,
         '{node|short} {desc|firstline}\n');
     }
 
     if (!trim($out)) {
       $this->restoreBranch();
       throw new ArcanistUsageException(
         pht('No commits to land from %s.', $this->branch));
     }
 
     echo pht("The following commit(s) will be landed:\n\n%s", $out), "\n";
   }
 
   private function findRevision() {
     $repository_api = $this->getRepositoryAPI();
 
     $this->parseBaseCommitArgument(array($this->ontoRemoteBranch));
 
     $revision_id = $this->getArgument('revision');
     if ($revision_id) {
       $revision_id = $this->normalizeRevisionID($revision_id);
       $revisions = $this->getConduit()->callMethodSynchronous(
         'differential.query',
         array(
           'ids' => array($revision_id),
         ));
       if (!$revisions) {
         throw new ArcanistUsageException(pht(
           "No such revision '%s'!",
           "D{$revision_id}"));
       }
     } else {
       $revisions = $repository_api->loadWorkingCopyDifferentialRevisions(
         $this->getConduit(),
         array());
     }
 
     if (!count($revisions)) {
       throw new ArcanistUsageException(pht(
         "arc can not identify which revision exists on %s '%s'. Update the ".
         "revision with recent changes to synchronize the %s name and hashes, ".
         "or use '%s' to amend the commit message at HEAD, or use ".
         "'%s' to select a revision explicitly.",
         $this->branchType,
         $this->branch,
         $this->branchType,
         'arc amend',
         '--revision <id>'));
     } else if (count($revisions) > 1) {
       switch ($this->branchType) {
         case self::REFTYPE_BOOKMARK:
           $message = pht(
             "There are multiple revisions on feature bookmark '%s' which are ".
             "not present on '%s':\n\n".
             "%s\n".
             'Separate these revisions onto different bookmarks, or use '.
             '--revision <id> to use the commit message from <id> '.
             'and land them all.',
             $this->branch,
             $this->onto,
             $this->renderRevisionList($revisions));
           break;
         case self::REFTYPE_BRANCH:
         default:
           $message = pht(
             "There are multiple revisions on feature branch '%s' which are ".
             "not present on '%s':\n\n".
             "%s\n".
             'Separate these revisions onto different branches, or use '.
             '--revision <id> to use the commit message from <id> '.
             'and land them all.',
             $this->branch,
             $this->onto,
             $this->renderRevisionList($revisions));
           break;
       }
 
       throw new ArcanistUsageException($message);
     }
 
     $this->revision = head($revisions);
 
     $rev_status = $this->revision['status'];
     $rev_id = $this->revision['id'];
     $rev_title = $this->revision['title'];
     $rev_auxiliary = idx($this->revision, 'auxiliary', array());
 
     $full_name = pht('D%d: %s', $rev_id, $rev_title);
 
     if ($this->revision['authorPHID'] != $this->getUserPHID()) {
       $other_author = $this->getConduit()->callMethodSynchronous(
         'user.query',
         array(
           'phids' => array($this->revision['authorPHID']),
         ));
       $other_author = ipull($other_author, 'userName', 'phid');
       $other_author = $other_author[$this->revision['authorPHID']];
       $ok = phutil_console_confirm(pht(
         "This %s has revision '%s' but you are not the author. Land this ".
         "revision by %s?",
         $this->branchType,
         $full_name,
         $other_author));
       if (!$ok) {
         throw new ArcanistUserAbortException();
       }
     }
 
     $state_warning = null;
     $state_header = null;
     if ($rev_status == ArcanistDifferentialRevisionStatus::CHANGES_PLANNED) {
       $state_header = pht('REVISION HAS CHANGES PLANNED');
       $state_warning = pht(
         'The revision you are landing ("%s") is currently in the "%s" state, '.
         'indicating that you expect to revise it before moving forward.'.
         "\n\n".
         'Normally, you should resubmit it for review and wait until it is '.
         '"%s" by reviewers before you continue.'.
         "\n\n".
         'To resubmit the revision for review, either: update the revision '.
         'with revised changes; or use "Request Review" from the web interface.',
         $full_name,
         pht('Changes Planned'),
         pht('Accepted'));
     } else if ($rev_status != ArcanistDifferentialRevisionStatus::ACCEPTED) {
       $state_header = pht('REVISION HAS NOT BEEN ACCEPTED');
       $state_warning = pht(
         'The revision you are landing ("%s") has not been "%s" by reviewers.',
         $full_name,
         pht('Accepted'));
     }
 
     if ($state_warning !== null) {
       $prompt = pht('Land revision in the wrong state?');
 
       id(new PhutilConsoleBlock())
         ->addParagraph(tsprintf('<bg:yellow>** %s **</bg>', $state_header))
         ->addParagraph(tsprintf('%B', $state_warning))
         ->draw();
 
       $ok = phutil_console_confirm($prompt);
       if (!$ok) {
         throw new ArcanistUserAbortException();
       }
     }
 
     if ($rev_auxiliary) {
       $phids = idx($rev_auxiliary, 'phabricator:depends-on', array());
       if ($phids) {
         $dep_on_revs = $this->getConduit()->callMethodSynchronous(
           'differential.query',
            array(
              'phids' => $phids,
              'status' => 'status-open',
            ));
 
         $open_dep_revs = array();
         foreach ($dep_on_revs as $dep_on_rev) {
           $dep_on_rev_id = $dep_on_rev['id'];
           $dep_on_rev_title = $dep_on_rev['title'];
           $dep_on_rev_status = $dep_on_rev['status'];
           $open_dep_revs[$dep_on_rev_id] = $dep_on_rev_title;
         }
 
         if (!empty($open_dep_revs)) {
           $open_revs = array();
           foreach ($open_dep_revs as $id => $title) {
             $open_revs[] = '    - D'.$id.': '.$title;
           }
           $open_revs = implode("\n", $open_revs);
 
           echo pht(
             "Revision '%s' depends on open revisions:\n\n%s",
             "D{$rev_id}: {$rev_title}",
             $open_revs);
 
           $ok = phutil_console_confirm(pht('Continue anyway?'));
           if (!$ok) {
             throw new ArcanistUserAbortException();
           }
         }
       }
     }
 
     $message = $this->getConduit()->callMethodSynchronous(
       'differential.getcommitmessage',
       array(
         'revision_id' => $rev_id,
       ));
 
     $this->messageFile = new TempFile();
     Filesystem::writeFile($this->messageFile, $message);
 
     echo pht(
       "Landing revision '%s'...",
       "D{$rev_id}: {$rev_title}")."\n";
 
     $diff_phid = idx($this->revision, 'activeDiffPHID');
     if ($diff_phid) {
       $this->checkForBuildables($diff_phid);
     }
   }
 
   private function pullFromRemote() {
     $repository_api = $this->getRepositoryAPI();
 
     $local_ahead_of_remote = false;
     if ($this->isGit) {
       $repository_api->execxLocal('checkout %s', $this->onto);
 
       echo phutil_console_format(pht(
         "Switched to branch **%s**. Updating branch...\n",
         $this->onto));
 
       try {
         $repository_api->execxLocal('pull --ff-only --no-stat');
       } catch (CommandException $ex) {
         if (!$this->isGitSvn) {
           throw $ex;
         }
       }
       list($out) = $repository_api->execxLocal(
         'log %s..%s',
         $this->ontoRemoteBranch,
         $this->onto);
       if (strlen(trim($out))) {
         $local_ahead_of_remote = true;
       } else if ($this->isGitSvn) {
         $repository_api->execxLocal('svn rebase');
       }
 
     } else if ($this->isHg) {
       echo phutil_console_format(pht('Updating **%s**...', $this->onto)."\n");
 
       try {
         list($out, $err) = $repository_api->execxLocal('pull');
 
         $divergedbookmark = $this->onto.'@'.$repository_api->getBranchName();
         if (strpos($err, $divergedbookmark) !== false) {
           throw new ArcanistUsageException(phutil_console_format(pht(
             "Local bookmark **%s** has diverged from the server's **%s** ".
             "(now labeled **%s**). Please resolve this divergence and run ".
             "'%s' again.",
             $this->onto,
             $this->onto,
             $divergedbookmark,
             'arc land')));
         }
       } catch (CommandException $ex) {
         $err = $ex->getError();
         $stdout = $ex->getStdout();
 
         // Copied from: PhabricatorRepositoryPullLocalDaemon.php
         // NOTE: Between versions 2.1 and 2.1.1, Mercurial changed the
         // behavior of "hg pull" to return 1 in case of a successful pull
         // with no changes. This behavior has been reverted, but users who
         // updated between Feb 1, 2012 and Mar 1, 2012 will have the
         // erroring version. Do a dumb test against stdout to check for this
         // possibility.
         // See: https://github.com/phacility/phabricator/issues/101/
 
         // NOTE: Mercurial has translated versions, which translate this error
         // string. In a translated version, the string will be something else,
         // like "aucun changement trouve". There didn't seem to be an easy way
         // to handle this (there are hard ways but this is not a common
         // problem and only creates log spam, not application failures).
         // Assume English.
 
         // TODO: Remove this once we're far enough in the future that
         // deployment of 2.1 is exceedingly rare?
         if ($err != 1 || !preg_match('/no changes found/', $stdout)) {
           throw $ex;
         }
       }
 
       // Pull succeeded. Now make sure master is not on an outgoing change
       if ($repository_api->supportsPhases()) {
         list($out) = $repository_api->execxLocal(
           'log -r %s --template %s', $this->onto, '{phase}');
         if ($out != 'public') {
           $local_ahead_of_remote = true;
         }
       } else {
         // execManual instead of execx because outgoing returns
         // code 1 when there is nothing outgoing
         list($err, $out) = $repository_api->execManualLocal(
           'outgoing -r %s',
           $this->onto);
 
         // $err === 0 means something is outgoing
         if ($err === 0) {
           $local_ahead_of_remote = true;
         }
       }
     }
 
     if ($local_ahead_of_remote) {
       throw new ArcanistUsageException(pht(
         "Local %s '%s' is ahead of remote %s '%s', so landing a feature ".
         "%s would push additional changes. Push or reset the changes in '%s' ".
         "before running '%s'.",
         $this->ontoType,
         $this->onto,
         $this->ontoType,
         $this->ontoRemoteBranch,
         $this->ontoType,
         $this->onto,
         'arc land'));
     }
   }
 
   private function rebase() {
     $repository_api = $this->getRepositoryAPI();
 
     chdir($repository_api->getPath());
     if ($this->isHg) {
       $onto_tip = $repository_api->getCanonicalRevisionName($this->onto);
       $common_ancestor = $repository_api->getCanonicalRevisionName(
         hgsprintf('ancestor(%s, %s)', $this->onto, $this->branch));
 
       // Only rebase if the local branch is not at the tip of the onto branch.
       if ($onto_tip != $common_ancestor) {
         // keep branch here so later we can decide whether to remove it
         $err = $repository_api->execPassthru(
           'rebase -d %s --keepbranches',
           $this->onto);
         if ($err) {
           echo phutil_console_format("%s\n", pht('Aborting rebase'));
           $repository_api->execManualLocal('rebase --abort');
           $this->restoreBranch();
           throw new ArcanistUsageException(pht(
             "'%s' failed and the rebase was aborted. This is most ".
             "likely due to conflicts. Manually rebase %s onto %s, resolve ".
             "the conflicts, then run '%s' again.",
             sprintf('hg rebase %s', $this->onto),
             $this->branch,
             $this->onto,
             'arc land'));
         }
       }
     }
 
     $repository_api->reloadWorkingCopy();
   }
 
   private function squash() {
     $repository_api = $this->getRepositoryAPI();
 
     if ($this->isGit) {
       $repository_api->execxLocal('checkout %s', $this->onto);
       $repository_api->execxLocal(
         'merge --no-stat --squash --ff-only %s',
         $this->branch);
     } else if ($this->isHg) {
       // The hg code is a little more complex than git's because we
       // need to handle the case where the landing branch has child branches:
       // -a--------b  master
       //   \
       //    w--x  mybranch
       //        \--y  subbranch1
       //         \--z  subbranch2
       //
       // arc land --branch mybranch --onto master :
       // -a--b--wx  master
       //          \--y  subbranch1
       //           \--z  subbranch2
 
       $branch_rev_id = $repository_api->getCanonicalRevisionName($this->branch);
 
       // At this point $this->onto has been pulled from remote and
       // $this->branch has been rebased on top of onto(by the rebase()
       // function). So we're guaranteed to have onto as an ancestor of branch
       // when we use first((onto::branch)-onto) below.
       $branch_root = $repository_api->getCanonicalRevisionName(
         hgsprintf('first((%s::%s)-%s)',
           $this->onto,
           $this->branch,
           $this->onto));
 
       $branch_range = hgsprintf(
         '(%s::%s)',
         $branch_root,
         $this->branch);
 
       if (!$this->keepBranch) {
         $this->handleAlternateBranches($branch_root, $branch_range);
       }
 
       // Collapse just the landing branch onto master.
       // Leave its children on the original branch.
       $err = $repository_api->execPassthru(
         'rebase --collapse --keep --logfile %s -r %s -d %s',
         $this->messageFile,
         $branch_range,
         $this->onto);
 
       if ($err) {
         $repository_api->execManualLocal('rebase --abort');
         $this->restoreBranch();
         throw new ArcanistUsageException(
           pht(
             "Squashing the commits under %s failed. ".
             "Manually squash your commits and run '%s' again.",
             $this->branch,
             'arc land'));
       }
 
       if ($repository_api->isBookmark($this->branch)) {
         // a bug in mercurial means bookmarks end up on the revision prior
         // to the collapse when using --collapse with --keep,
         // so we manually move them to the correct spots
         // see: http://bz.selenic.com/show_bug.cgi?id=3716
         $repository_api->execxLocal(
           'bookmark -f %s',
           $this->onto);
 
         $repository_api->execxLocal(
           'bookmark -f %s -r %s',
           $this->branch,
           $branch_rev_id);
       }
 
       // check if the branch had children
       list($output) = $repository_api->execxLocal(
         'log -r %s --template %s',
         hgsprintf('children(%s)', $this->branch),
         '{node}\n');
 
       $child_branch_roots = phutil_split_lines($output, false);
       $child_branch_roots = array_filter($child_branch_roots);
       if ($child_branch_roots) {
         // move the branch's children onto the collapsed commit
         foreach ($child_branch_roots as $child_root) {
           $repository_api->execxLocal(
             'rebase -d %s -s %s --keep --keepbranches',
             $this->onto,
             $child_root);
         }
       }
 
       // All the rebases may have moved us to another branch
       // so we move back.
       $repository_api->execxLocal('checkout %s', $this->onto);
     }
   }
 
   /**
    * Detect alternate branches and prompt the user for how to handle
    * them. An alternate branch is a branch that forks from the landing
    * branch prior to the landing branch tip.
    *
    * In a situation like this:
    *   -a--------b  master
    *     \
    *      w--x  landingbranch
    *       \  \-- g subbranch
    *        \--y  altbranch1
    *         \--z  altbranch2
    *
    * y and z are alternate branches and will get deleted by the squash,
    * so we need to detect them and ask the user what they want to do.
    *
    * @param string The revision id of the landing branch's root commit.
    * @param string The revset specifying all the commits in the landing branch.
    * @return void
    */
   private function handleAlternateBranches($branch_root, $branch_range) {
     $repository_api = $this->getRepositoryAPI();
 
     // Using the tree in the doccomment, the revset below resolves as follows:
     // 1. roots(descendants(w) - descendants(x) - (w::x))
     // 2. roots({x,g,y,z} - {g} - {w,x})
     // 3. roots({y,z})
     // 4. {y,z}
     $alt_branch_revset = hgsprintf(
       'roots(descendants(%s)-descendants(%s)-%R)',
       $branch_root,
       $this->branch,
       $branch_range);
     list($alt_branches) = $repository_api->execxLocal(
       'log --template %s -r %s',
       '{node}\n',
        $alt_branch_revset);
 
     $alt_branches = phutil_split_lines($alt_branches, false);
     $alt_branches = array_filter($alt_branches);
 
     $alt_count = count($alt_branches);
     if ($alt_count > 0) {
       $input = phutil_console_prompt(pht(
         "%s '%s' has %s %s(s) forking off of it that would be deleted ".
         "during a squash. Would you like to keep a non-squashed copy, rebase ".
         "them on top of '%s', or abort and deal with them yourself? ".
         "(k)eep, (r)ebase, (a)bort:",
         ucfirst($this->branchType),
         $this->branch,
         $alt_count,
         $this->branchType,
         $this->branch));
 
       if ($input == 'k' || $input == 'keep') {
         $this->keepBranch = true;
       } else if ($input == 'r' || $input == 'rebase') {
         foreach ($alt_branches as $alt_branch) {
           $repository_api->execxLocal(
             'rebase --keep --keepbranches -d %s -s %s',
             $this->branch,
             $alt_branch);
         }
       } else if ($input == 'a' || $input == 'abort') {
         $branch_string = implode("\n", $alt_branches);
         echo
           "\n",
           pht(
             "Remove the %s starting at these revisions and run %s again:\n%s",
             $this->branchType.'s',
             $branch_string,
             'arc land'),
           "\n\n";
         throw new ArcanistUserAbortException();
       } else {
         throw new ArcanistUsageException(
           pht('Invalid choice. Aborting arc land.'));
       }
     }
   }
 
   private function merge() {
     $repository_api = $this->getRepositoryAPI();
 
     // In immutable histories, do a --no-ff merge to force a merge commit with
     // the right message.
     $repository_api->execxLocal('checkout %s', $this->onto);
 
     chdir($repository_api->getPath());
     if ($this->isGit) {
       $err = phutil_passthru(
         'git merge --no-stat --no-ff --no-commit %s',
         $this->branch);
 
       if ($err) {
         throw new ArcanistUsageException(pht(
           "'%s' failed. Your working copy has been left in a partially ".
           "merged state. You can: abort with '%s'; or follow the ".
           "instructions to complete the merge.",
           'git merge',
           'git merge --abort'));
       }
     } else if ($this->isHg) {
       // HG arc land currently doesn't support --merge.
       // When merging a bookmark branch to a master branch that
       // hasn't changed since the fork, mercurial fails to merge.
       // Instead of only working in some cases, we just disable --merge
       // until there is a demand for it.
       // The user should never reach this line, since --merge is
       // forbidden at the command line argument level.
       throw new ArcanistUsageException(
         pht('%s is not currently supported for hg repos.', '--merge'));
     }
   }
 
   private function push() {
     $repository_api = $this->getRepositoryAPI();
 
     // These commands can fail legitimately (e.g. commit hooks)
     try {
       if ($this->isGit) {
         $repository_api->execxLocal('commit -F %s', $this->messageFile);
         if (phutil_is_windows()) {
           // Occasionally on large repositories on Windows, Git can exit with
           // an unclean working copy here. This prevents reverts from being
           // pushed to the remote when this occurs.
           $this->requireCleanWorkingCopy();
         }
       } else if ($this->isHg) {
         // hg rebase produces a commit earlier as part of rebase
         if (!$this->useSquash) {
           $repository_api->execxLocal(
             'commit --logfile %s',
             $this->messageFile);
         }
       }
       // We dispatch this event so we can run checks on the merged revision,
       // right before it gets pushed out. It's easier to do this in arc land
       // than to try to hook into git/hg.
       $this->didCommitMerge();
     } catch (Exception $ex) {
       $this->executeCleanupAfterFailedPush();
       throw $ex;
     }
 
     if ($this->getArgument('hold')) {
       echo phutil_console_format(pht(
         'Holding change in **%s**: it has NOT been pushed yet.',
         $this->onto)."\n");
     } else {
       echo pht('Pushing change...'), "\n\n";
 
       chdir($repository_api->getPath());
 
       if ($this->isGitSvn) {
         $err = phutil_passthru('git svn dcommit');
         $cmd = 'git svn dcommit';
       } else if ($this->isGit) {
         $err = phutil_passthru('git push %s %s', $this->remote, $this->onto);
         $cmd = 'git push';
       } else if ($this->isHgSvn) {
         // hg-svn doesn't support 'push -r', so we do a normal push
         // which hg-svn modifies to only push the current branch and
         // ancestors.
         $err = $repository_api->execPassthru('push %s', $this->remote);
         $cmd = 'hg push';
       } else if ($this->isHg) {
         if (strlen($this->remote)) {
           $err = $repository_api->execPassthru(
             'push -r %s %s',
             $this->onto,
             $this->remote);
         } else {
           $err = $repository_api->execPassthru(
             'push -r %s',
             $this->onto);
         }
         $cmd = 'hg push';
       }
 
       if ($err) {
         echo phutil_console_format(
           "<bg:red>**   %s   **</bg>\n",
           pht('PUSH FAILED!'));
         $this->executeCleanupAfterFailedPush();
         if ($this->isGit) {
           throw new ArcanistUsageException(pht(
             "'%s' failed! Fix the error and run '%s' again.",
             $cmd,
             'arc land'));
         }
         throw new ArcanistUsageException(pht(
           "'%s' failed! Fix the error and push this change manually.",
           $cmd));
       }
 
       $this->didPush();
 
       echo "\n";
     }
   }
 
   private function executeCleanupAfterFailedPush() {
     $repository_api = $this->getRepositoryAPI();
     if ($this->isGit) {
       $repository_api->execxLocal('reset --hard HEAD^');
       $this->restoreBranch();
     } else if ($this->isHg) {
       $repository_api->execxLocal(
         '--config extensions.mq= strip %s',
         $this->onto);
       $this->restoreBranch();
     }
   }
 
   private function cleanupBranch() {
     $repository_api = $this->getRepositoryAPI();
 
     echo pht('Cleaning up feature %s...', $this->branchType), "\n";
     if ($this->isGit) {
       list($ref) = $repository_api->execxLocal(
         'rev-parse --verify %s',
         $this->branch);
       $ref = trim($ref);
       $recovery_command = csprintf(
         'git checkout -b %s %s',
         $this->branch,
         $ref);
       echo pht('(Use `%s` if you want it back.)', $recovery_command), "\n";
       $repository_api->execxLocal('branch -D %s', $this->branch);
     } else if ($this->isHg) {
       $common_ancestor = $repository_api->getCanonicalRevisionName(
         hgsprintf('ancestor(%s,%s)', $this->onto, $this->branch));
 
       $branch_root = $repository_api->getCanonicalRevisionName(
         hgsprintf('first((%s::%s)-%s)',
           $common_ancestor,
           $this->branch,
           $common_ancestor));
 
       $repository_api->execxLocal(
         '--config extensions.mq= strip -r %s',
         $branch_root);
 
       if ($repository_api->isBookmark($this->branch)) {
         $repository_api->execxLocal('bookmark -d %s', $this->branch);
       }
     }
 
     if ($this->getArgument('delete-remote')) {
       if ($this->isHg) {
         // named branches were closed as part of the earlier commit
         // so only worry about bookmarks
         if ($repository_api->isBookmark($this->branch)) {
           $repository_api->execxLocal(
             'push -B %s %s',
             $this->branch,
             $this->remote);
         }
       }
     }
   }
 
   public function getSupportedRevisionControlSystems() {
     return array('git', 'hg');
   }
 
   private function getBranchOrBookmark() {
     $repository_api = $this->getRepositoryAPI();
     if ($this->isGit) {
       $branch = $repository_api->getBranchName();
 
       // If we don't have a branch name, just use whatever's at HEAD.
       if (!strlen($branch) && !$this->isGitSvn) {
         $branch = $repository_api->getWorkingCopyRevision();
       }
     } else if ($this->isHg) {
       $branch = $repository_api->getActiveBookmark();
       if (!$branch) {
         $branch = $repository_api->getBranchName();
       }
     }
 
     return $branch;
   }
 
   private function getBranchType($branch) {
     $repository_api = $this->getRepositoryAPI();
     if ($this->isHg && $repository_api->isBookmark($branch)) {
       return 'bookmark';
     }
     return 'branch';
   }
 
   /**
    * Restore the original branch, e.g. after a successful land or a failed
    * pull.
    */
   private function restoreBranch() {
     $repository_api = $this->getRepositoryAPI();
     $repository_api->execxLocal('checkout %s', $this->oldBranch);
     if ($this->isGit) {
       $repository_api->execxLocal('submodule update --init --recursive');
     }
     echo pht(
       "Switched back to %s %s.\n",
       $this->branchType,
       phutil_console_format('**%s**', $this->oldBranch));
   }
 
 
   /**
    * Check if a diff has a running or failed buildable, and prompt the user
    * before landing if it does.
    */
   private function checkForBuildables($diff_phid) {
     // Try to use the more modern check which respects the "Warn on Land"
     // behavioral flag on build plans if we can. This newer check won't work
     // unless the server is running code from March 2019 or newer since the
     // API methods we need won't exist yet. We'll fall back to the older check
     // if this one doesn't work out.
     try {
       $this->checkForBuildablesWithPlanBehaviors($diff_phid);
       return;
     } catch (ArcanistUserAbortException $abort_ex) {
       throw $abort_ex;
     } catch (Exception $ex) {
       // Continue with the older approach, below.
     }
 
     // NOTE: Since Harbormaster is still beta and this stuff all got added
     // recently, just bail if we can't find a buildable. This is just an
     // advisory check intended to prevent human error.
 
     try {
       $buildables = $this->getConduit()->callMethodSynchronous(
         'harbormaster.querybuildables',
         array(
           'buildablePHIDs' => array($diff_phid),
           'manualBuildables' => false,
         ));
     } catch (ConduitClientException $ex) {
       return;
     }
 
     if (!$buildables['data']) {
       // If there's no corresponding buildable, we're done.
       return;
     }
 
     $console = PhutilConsole::getConsole();
 
     $buildable = head($buildables['data']);
 
     if ($buildable['buildableStatus'] == 'passed') {
       $console->writeOut(
         "**<bg:green> %s </bg>** %s\n",
         pht('BUILDS PASSED'),
         pht('Harbormaster builds for the active diff completed successfully.'));
       return;
     }
 
     switch ($buildable['buildableStatus']) {
       case 'building':
         $message = pht(
           'Harbormaster is still building the active diff for this revision.');
         $prompt = pht('Land revision anyway, despite ongoing build?');
         break;
       case 'failed':
         $message = pht(
           'Harbormaster failed to build the active diff for this revision.');
         $prompt = pht('Land revision anyway, despite build failures?');
         break;
       default:
         // If we don't recognize the status, just bail.
         return;
     }
 
     $builds = $this->queryBuilds(
       array(
         'buildablePHIDs' => array($buildable['phid']),
       ));
 
     $console->writeOut($message."\n\n");
 
     $builds = msort($builds, 'getStatusSortVector');
     foreach ($builds as $build) {
       $ansi_color = $build->getStatusANSIColor();
       $status_name = $build->getStatusName();
       $object_name = $build->getObjectName();
       $build_name = $build->getName();
 
       echo tsprintf(
         "    **<bg:".$ansi_color."> %s </bg>** %s: %s\n",
         $status_name,
         $object_name,
         $build_name);
     }
 
     $console->writeOut(
       "\n%s\n\n    **%s**: __%s__",
       pht('You can review build details here:'),
       pht('Harbormaster URI'),
       $buildable['uri']);
 
     if (!phutil_console_confirm($prompt)) {
       throw new ArcanistUserAbortException();
     }
   }
 
   private function checkForBuildablesWithPlanBehaviors($diff_phid) {
     // TODO: These queries should page through all results instead of fetching
     // only the first page, but we don't have good primitives to support that
     // in "master" yet.
 
     $this->writeInfo(
       pht('BUILDS'),
       pht('Checking build status...'));
 
     $raw_buildables = $this->getConduit()->callMethodSynchronous(
       'harbormaster.buildable.search',
       array(
         'constraints' => array(
           'objectPHIDs' => array(
             $diff_phid,
           ),
           'manual' => false,
         ),
       ));
 
     if (!$raw_buildables['data']) {
       return;
     }
 
     $buildables = $raw_buildables['data'];
     $buildable_phids = ipull($buildables, 'phid');
 
     $raw_builds = $this->getConduit()->callMethodSynchronous(
       'harbormaster.build.search',
       array(
         'constraints' => array(
           'buildables' => $buildable_phids,
         ),
       ));
 
     if (!$raw_builds['data']) {
       return;
     }
 
     $builds = array();
     foreach ($raw_builds['data'] as $raw_build) {
       $build_ref = ArcanistBuildRef::newFromConduit($raw_build);
       $build_phid = $build_ref->getPHID();
       $builds[$build_phid] = $build_ref;
     }
 
     $plan_phids = mpull($builds, 'getBuildPlanPHID');
     $plan_phids = array_values($plan_phids);
 
     $raw_plans = $this->getConduit()->callMethodSynchronous(
       'harbormaster.buildplan.search',
       array(
         'constraints' => array(
           'phids' => $plan_phids,
         ),
       ));
 
     $plans = array();
     foreach ($raw_plans['data'] as $raw_plan) {
       $plan_ref = ArcanistBuildPlanRef::newFromConduit($raw_plan);
       $plan_phid = $plan_ref->getPHID();
       $plans[$plan_phid] = $plan_ref;
     }
 
     $ongoing_builds = array();
     $failed_builds = array();
 
     $builds = msort($builds, 'getStatusSortVector');
     foreach ($builds as $build_ref) {
       $plan = idx($plans, $build_ref->getBuildPlanPHID());
       if (!$plan) {
         continue;
       }
 
       $plan_behavior = $plan->getBehavior('arc-land', 'always');
       $if_building = ($plan_behavior == 'building');
       $if_complete = ($plan_behavior == 'complete');
       $if_never = ($plan_behavior == 'never');
 
       // If the build plan "Never" warns when landing, skip it.
       if ($if_never) {
         continue;
       }
 
       // If the build plan warns when landing "If Complete" but the build is
       // not complete, skip it.
       if ($if_complete && !$build_ref->isComplete()) {
         continue;
       }
 
       // If the build plan warns when landing "If Building" but the build is
       // complete, skip it.
       if ($if_building && $build_ref->isComplete()) {
         continue;
       }
 
       // Ignore passing builds.
       if ($build_ref->isPassed()) {
         continue;
       }
 
       if (!$build_ref->isComplete()) {
         $ongoing_builds[] = $build_ref;
       } else {
         $failed_builds[] = $build_ref;
       }
     }
 
     if (!$ongoing_builds && !$failed_builds) {
       return;
     }
 
     if ($failed_builds) {
       $this->writeWarn(
         pht('BUILD FAILURES'),
         pht(
           'Harbormaster failed to build the active diff for this revision:'));
       $prompt = pht('Land revision anyway, despite build failures?');
     } else if ($ongoing_builds) {
       $this->writeWarn(
         pht('ONGOING BUILDS'),
         pht(
           'Harbormaster is still building the active diff for this revision:'));
       $prompt = pht('Land revision anyway, despite ongoing build?');
     }
 
     $show_builds = array_merge($failed_builds, $ongoing_builds);
     echo "\n";
     foreach ($show_builds as $build_ref) {
       $ansi_color = $build_ref->getStatusANSIColor();
       $status_name = $build_ref->getStatusName();
       $object_name = $build_ref->getObjectName();
       $build_name = $build_ref->getName();
 
       echo tsprintf(
         "    **<bg:".$ansi_color."> %s </bg>** %s: %s\n",
         $status_name,
         $object_name,
         $build_name);
     }
 
     echo tsprintf(
       "\n%s\n\n",
       pht('You can review build details here:'));
 
     foreach ($buildables as $buildable) {
       $buildable_uri = id(new PhutilURI($this->getConduitURI()))
         ->setPath(sprintf('/B%d', $buildable['id']));
 
       echo tsprintf(
         "          **%s**: __%s__\n",
         pht('Buildable %d', $buildable['id']),
         $buildable_uri);
     }
 
     if (!phutil_console_confirm($prompt)) {
       throw new ArcanistUserAbortException();
     }
   }
 
   public function buildEngineMessage(ArcanistLandEngine $engine) {
     // TODO: This is oh-so-gross.
     $this->findRevision();
     $engine->setCommitMessageFile($this->messageFile);
   }
 
   public function didCommitMerge() {
     $this->dispatchEvent(
       ArcanistEventType::TYPE_LAND_WILLPUSHREVISION,
       array());
   }
 
   public function didPush() {
     $this->askForRepositoryUpdate();
 
     $mark_workflow = $this->buildChildWorkflow(
       'close-revision',
       array(
         '--finalize',
         '--quiet',
         $this->revision['id'],
       ));
     $mark_workflow->run();
   }
 
   private function queryBuilds(array $constraints) {
     $conduit = $this->getConduit();
 
     // NOTE: This method only loads the 100 most recent builds. It's rare for
     // a revision to have more builds than that and there's currently no paging
     // wrapper for "*.search" Conduit API calls available in Arcanist.
 
     try {
       $raw_result = $conduit->callMethodSynchronous(
         'harbormaster.build.search',
         array(
           'constraints' => $constraints,
         ));
     } catch (Exception $ex) {
       // If the server doesn't have "harbormaster.build.search" yet (Aug 2016),
       // try the older "harbormaster.querybuilds" instead.
       $raw_result = $conduit->callMethodSynchronous(
         'harbormaster.querybuilds',
         $constraints);
     }
 
     $refs = array();
     foreach ($raw_result['data'] as $raw_data) {
       $refs[] = ArcanistBuildRef::newFromConduit($raw_data);
     }
 
     return $refs;
   }
 
 
 }