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diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -346,6 +346,8 @@
'ArcanistUpgradeWorkflow' => 'workflow/ArcanistUpgradeWorkflow.php',
'ArcanistUploadWorkflow' => 'workflow/ArcanistUploadWorkflow.php',
'ArcanistUsageException' => 'exception/ArcanistUsageException.php',
+ 'ArcanistUseStatementNamespacePrefixXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistUseStatementNamespacePrefixXHPASTLinterRule.php',
+ 'ArcanistUseStatementNamespacePrefixXHPASTLinterRuleTestCase' => 'lint/linter/xhpast/rules/__tests__/ArcanistUseStatementNamespacePrefixXHPASTLinterRuleTestCase.php',
'ArcanistUselessOverridingMethodXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistUselessOverridingMethodXHPASTLinterRule.php',
'ArcanistUselessOverridingMethodXHPASTLinterRuleTestCase' => 'lint/linter/xhpast/rules/__tests__/ArcanistUselessOverridingMethodXHPASTLinterRuleTestCase.php',
'ArcanistUserAbortException' => 'exception/usage/ArcanistUserAbortException.php',
@@ -718,6 +720,8 @@
'ArcanistUpgradeWorkflow' => 'ArcanistWorkflow',
'ArcanistUploadWorkflow' => 'ArcanistWorkflow',
'ArcanistUsageException' => 'Exception',
+ 'ArcanistUseStatementNamespacePrefixXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
+ 'ArcanistUseStatementNamespacePrefixXHPASTLinterRuleTestCase' => 'ArcanistXHPASTLinterRuleTestCase',
'ArcanistUselessOverridingMethodXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
'ArcanistUselessOverridingMethodXHPASTLinterRuleTestCase' => 'ArcanistXHPASTLinterRuleTestCase',
'ArcanistUserAbortException' => 'ArcanistUsageException',
diff --git a/src/lint/linter/xhpast/rules/ArcanistUseStatementNamespacePrefixXHPASTLinterRule.php b/src/lint/linter/xhpast/rules/ArcanistUseStatementNamespacePrefixXHPASTLinterRule.php
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/xhpast/rules/ArcanistUseStatementNamespacePrefixXHPASTLinterRule.php
@@ -0,0 +1,38 @@
+<?php
+
+final class ArcanistUseStatementNamespacePrefixXHPASTLinterRule
+ extends ArcanistXHPASTLinterRule {
+
+ const ID = 93;
+
+ public function getLintName() {
+ return pht('`%s` Statement Namespace Prefix', 'use');
+ }
+
+ public function getLintSeverity() {
+ return ArcanistLintSeverity::SEVERITY_WARNING;
+ }
+
+ public function process(XHPASTNode $root) {
+ $use_lists = $root->selectDescendantsOfType('n_USE_LIST');
+
+ foreach ($use_lists as $use_list) {
+ $uses = $use_list->selectDescendantsOfType('n_USE');
+
+ foreach ($uses as $use) {
+ $symbol = $use->getChildOfType(0, 'n_SYMBOL_NAME');
+ $symbol_name = $symbol->getConcreteString();
+
+ if ($symbol_name[0] == '\\') {
+ $this->raiseLintAtNode(
+ $symbol,
+ pht(
+ 'Imported symbols should not be prefixed with `%s`.',
+ '\\'),
+ substr($symbol_name, 1));
+ }
+ }
+ }
+ }
+
+}
diff --git a/src/lint/linter/xhpast/rules/__tests__/ArcanistUseStatementNamespacePrefixXHPASTLinterRuleTestCase.php b/src/lint/linter/xhpast/rules/__tests__/ArcanistUseStatementNamespacePrefixXHPASTLinterRuleTestCase.php
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/xhpast/rules/__tests__/ArcanistUseStatementNamespacePrefixXHPASTLinterRuleTestCase.php
@@ -0,0 +1,11 @@
+<?php
+
+final class ArcanistUseStatementNamespacePrefixXHPASTLinterRuleTestCase
+ extends ArcanistXHPASTLinterRuleTestCase {
+
+ public function testLinter() {
+ $this->executeTestsInDirectory(
+ dirname(__FILE__).'/use-statement-namespace-prefix/');
+ }
+
+}
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
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/xhpast/rules/__tests__/use-statement-namespace-prefix/use.lint-test
@@ -0,0 +1,11 @@
+<?php
+namespace SomeNamespace;
+use X\Y\Z;
+use \X\Y\Z;
+~~~~~~~~~~
+warning:4:5
+~~~~~~~~~~
+<?php
+namespace SomeNamespace;
+use X\Y\Z;
+use X\Y\Z;

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