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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
@@ -156,6 +156,7 @@
'ArcanistLinter' => 'lint/linter/ArcanistLinter.php',
'ArcanistLinterTestCase' => 'lint/linter/__tests__/ArcanistLinterTestCase.php',
'ArcanistLintersWorkflow' => 'workflow/ArcanistLintersWorkflow.php',
+ 'ArcanistListAssignmentXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistListAssignmentXHPASTLinterRule.php',
'ArcanistListWorkflow' => 'workflow/ArcanistListWorkflow.php',
'ArcanistLogicalOperatorsXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistLogicalOperatorsXHPASTLinterRule.php',
'ArcanistLowercaseFunctionsXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistLowercaseFunctionsXHPASTLinterRule.php',
@@ -435,6 +436,7 @@
'ArcanistLinter' => 'Phobject',
'ArcanistLinterTestCase' => 'PhutilTestCase',
'ArcanistLintersWorkflow' => 'ArcanistWorkflow',
+ 'ArcanistListAssignmentXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
'ArcanistListWorkflow' => 'ArcanistWorkflow',
'ArcanistLogicalOperatorsXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
'ArcanistLowercaseFunctionsXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
diff --git a/src/lint/linter/__tests__/xhpast/list-assignment.lint-test b/src/lint/linter/__tests__/xhpast/list-assignment.lint-test
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/__tests__/xhpast/list-assignment.lint-test
@@ -0,0 +1,11 @@
+<?php
+list($x, $y, , ,) = array();
+list($x, $y, , , $z) = array();
+~~~~~~~~~~
+warning:2:12
+warning:2:14
+warning:2:16
+~~~~~~~~~~
+<?php
+list($x, $y ) = array();
+list($x, $y, , , $z) = array();
diff --git a/src/lint/linter/xhpast/rules/ArcanistListAssignmentXHPASTLinterRule.php b/src/lint/linter/xhpast/rules/ArcanistListAssignmentXHPASTLinterRule.php
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/xhpast/rules/ArcanistListAssignmentXHPASTLinterRule.php
@@ -0,0 +1,38 @@
+<?php
+
+final class ArcanistListAssignmentXHPASTLinterRule
+ extends ArcanistXHPASTLinterRule {
+
+ const ID = 77;
+
+ public function getLintName() {
+ return pht('List Assignment');
+ }
+
+ public function getLintSeverity() {
+ return ArcanistLintSeverity::SEVERITY_WARNING;
+ }
+
+ public function process(XHPASTNode $root) {
+ $assignment_lists = $root->selectDescendantsOfType('n_ASSIGNMENT_LIST');
+
+ foreach ($assignment_lists as $assignment_list) {
+ $tokens = array_slice($assignment_list->getTokens(), 1, -1);
+
+ foreach (array_reverse($tokens) as $token) {
+ if ($token->getTypeName() == ',') {
+ $this->raiseLintAtToken(
+ $token,
+ pht('Unnecessary comma in list assignment.'),
+ '');
+ continue;
+ }
+
+ if ($token->isSemantic()) {
+ break;
+ }
+ }
+ }
+ }
+
+}

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