[linter] Issue 295. Skip comment tokens with GitHub code blocks (in ```).

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/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/src/dart/ast/token.dart';
@@ skipping 6516 matching lines @@
     List<CommentReference> references =
         parse("parseCommentReferences", <Object>[tokens], "")
         as List<CommentReference>;
     expect(references, hasLength(1));
     CommentReference reference = references[0];
     expect(reference, isNotNull);
     expect(reference.identifier, isNotNull);
     expect(reference.offset, 16);
   }
 
+  void test_parseCommentReferences_skipCodeBlock_gitHub_multiLine() {
+    List<DocumentationCommentToken> tokens = <DocumentationCommentToken>[
+      new DocumentationCommentToken(
+          TokenType.MULTI_LINE_COMMENT,
+          r'''
+/**
+ * First.
+ * ```dart
+ * Some [int] reference.
+ * ```
+ * Last.
+ */
+''',
+          3)
+    ];
+    List<CommentReference> references =
+        parse("parseCommentReferences", <Object>[tokens], "")
+        as List<CommentReference>;
+    expect(references, isEmpty);
+  }
+
+  void test_parseCommentReferences_skipCodeBlock_gitHub_multiLine_lines() {
+    String commentText = r'''
+/// First.
+/// ```dart
+/// Some [int] reference.
+/// ```
+/// Last.
+''';
+    List<DocumentationCommentToken> tokens = commentText
+        .split('\n')
+        .map((line) => new DocumentationCommentToken(
+            TokenType.SINGLE_LINE_COMMENT, line, 0))
+        .toList();
+    List<CommentReference> references =
+        parse("parseCommentReferences", <Object>[tokens], "")
+        as List<CommentReference>;
+    expect(references, isEmpty);
+  }
+
   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], "")
         as List<CommentReference>;
     expect(references, hasLength(2));
   }
@@ skipping 4801 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;
   }
 }