quick fix for INVALID_USE_OF_COVARIANT_IN_EXTENSION

See: #55917

Change-Id: I1fac6f8f1bcdb0e2ede3f7766c24ada1ee037f45
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/370060
Auto-Submit: Phil Quitslund <[email protected]>
Commit-Queue: Phil Quitslund <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Brian Wilkerson <[email protected]>

Author: pq

pkg/analysis_server/lib/src/services/correction/error_fix_status.yaml

@@ -45,8 +45,8 @@
 #
 # Stats:
 # -  42 "needsEvaluation"
-# - 340 "needsFix"
-# - 411 "hasFix"
+# - 339 "needsFix"
+# - 412 "hasFix"
 # - 516 "noFix"
 
 AnalysisOptionsErrorCode.INCLUDED_FILE_PARSE_ERROR:
@@ -2974,9 +2974,7 @@ ParserErrorCode.INVALID_UNICODE_ESCAPE_U_NO_BRACKET:
 ParserErrorCode.INVALID_UNICODE_ESCAPE_U_STARTED:
   status: noFix
 ParserErrorCode.INVALID_USE_OF_COVARIANT_IN_EXTENSION:
-  status: needsFix
-  notes: |-
-    Remove the `covariant`.
+  status: hasFix
 ParserErrorCode.LATE_PATTERN_VARIABLE_DECLARATION:
   status: hasFix
 ParserErrorCode.LIBRARY_DIRECTIVE_NOT_FIRST:

pkg/analysis_server/lib/src/services/correction/fix_internal.dart

@@ -1433,6 +1433,9 @@ final _builtInNonLintProducers = <ErrorCode, List<ProducerGenerator>>{
   ParserErrorCode.INVALID_INSIDE_UNARY_PATTERN: [
     SurroundWithParentheses.new,
   ],
+  ParserErrorCode.INVALID_USE_OF_COVARIANT_IN_EXTENSION: [
+    RemoveExtraModifier.new,
+  ],
   ParserErrorCode.LATE_PATTERN_VARIABLE_DECLARATION: [
     RemoveLate.new,
   ],

pkg/analysis_server/test/src/services/correction/fix/remove_extra_modifier_test.dart

@@ -149,6 +149,19 @@ void m() {}
 ''');
   }
 
+  Future<void> test_covariantInExtension() async {
+    await resolveTestCode(r'''
+extension E on String {
+  void f({covariant int a = 0}) {}
+}
+''');
+    await assertHasFix('''
+extension E on String {
+  void f({int a = 0}) {}
+}
+''');
+  }
+
   Future<void> test_covariantMember() async {
     await resolveTestCode(r'''
 class C {