Don't produce [references] in GitHub-like code blocks in comments.

pkg/analyzer/test/generated/parser_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.test.generated.parser_test;
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/generated/ast.dart';
@@ skipping 6760 matching lines @@
     ];
     List<CommentReference> references =
         parse("parseCommentReferences", <Object>[tokens], "");
     expect(references, hasLength(1));
     CommentReference reference = references[0];
     expect(reference, isNotNull);
     expect(reference.identifier, isNotNull);
     expect(reference.offset, 24);
   }
 
+  void test_parseCommentReferences_skipCodeBlock_gitHub() {
+    List<DocumentationCommentToken> tokens = <DocumentationCommentToken>[
+      new DocumentationCommentToken(
+          TokenType.MULTI_LINE_COMMENT, "/** `a[i]` and [b] */", 0)
+    ];
+    List<CommentReference> references =
+        parse("parseCommentReferences", <Object>[tokens], "");
+    expect(references, hasLength(1));
+    CommentReference reference = references[0];
+    expect(reference, isNotNull);
+    expect(reference.identifier, isNotNull);
+    expect(reference.offset, 16);
+  }
+
+  void test_parseCommentReferences_skipCodeBlock_gitHub_notTerminated() {
+    List<DocumentationCommentToken> tokens = <DocumentationCommentToken>[
+      new DocumentationCommentToken(
+          TokenType.MULTI_LINE_COMMENT, "/** `a[i] and [b] */", 0)
+    ];
+    List<CommentReference> references =
+        parse("parseCommentReferences", <Object>[tokens], "");
+    expect(references, hasLength(2));
+  }
+
   void test_parseCommentReferences_skipCodeBlock_spaces() {
     List<DocumentationCommentToken> tokens = <DocumentationCommentToken>[
       new DocumentationCommentToken(TokenType.MULTI_LINE_COMMENT,
           "/**\n *     a[i]\n * xxx [i] zzz\n */", 3)
     ];
     List<CommentReference> references =
         parse("parseCommentReferences", <Object>[tokens], "");
     expect(references, hasLength(1));
     CommentReference reference = references[0];
     expect(reference, isNotNull);
@@ skipping 4517 matching lines @@
         new Scanner(null, new CharSequenceReader(source), listener);
     Token tokenStream = scanner.tokenize();
     //
     // Parse the source.
     //
     Parser parser = new Parser(null, listener);
     return invokeParserMethodImpl(
         parser, methodName, <Object>[tokenStream], tokenStream) as Token;
   }
 }