Scan generic method comments with Fasta.

pkg/front_end/test/scanner_fasta_test.dart

 // Copyright (c) 2017, 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.
 
 import 'package:analyzer/src/fasta/token_utils.dart';
 import 'package:front_end/src/fasta/scanner/error_token.dart' as fasta;
 import 'package:front_end/src/fasta/scanner/keyword.dart' as fasta;
 import 'package:front_end/src/fasta/scanner/string_scanner.dart' as fasta;
 import 'package:front_end/src/fasta/scanner/token.dart' as fasta;
 import 'package:front_end/src/fasta/scanner/token_constants.dart' as fasta;
@@ skipping 11 matching lines @@
     defineReflectiveTests(ScannerTest_Fasta_Roundtrip);
   });
 }
 
 @reflectiveTest
 class ScannerTest_Fasta extends ScannerTestBase {
   @override
   Token scanWithListener(String source, ErrorListener listener,
       {bool genericMethodComments: false,
       bool lazyAssignmentOperators: false}) {
-    if (genericMethodComments) {
-      // Fasta doesn't support generic method comments.
-      // TODO(paulberry): once the analyzer toolchain no longer needs generic
-      // method comments, remove tests that exercise them.
-      fail('No generic method comment support in Fasta');
-    }
     // Note: Fasta always supports lazy assignment operators (`&&=` and `||=`),
     // so we can ignore the `lazyAssignmentOperators` flag.
     // TODO(paulberry): once lazyAssignmentOperators are fully supported by
     // Dart, remove this flag.
     var scanner = new fasta.StringScanner(source, includeComments: true);
+    scanner.scanGenericMethodComments = genericMethodComments;
     var token = scanner.tokenize();
     return new ToAnalyzerTokenStreamConverter_WithListener(listener)
         .convertTokens(token);
   }
 
   @override
   @failingTest
   void test_ampersand_ampersand_eq() {
     // TODO(paulberry,ahe): Fasta doesn't support `&&=` yet
     super.test_ampersand_ampersand_eq();
@@ skipping 83 matching lines @@
       token = token.next;
     }
     expect(tokenCount, 26);
     expect(spotCheckCount, 3);
     expect(commentTokenCount, 9);
     expect(token.precedingComments?.lexeme, '// EOF comment');
   }
 
   @override
   @failingTest
-  void test_comment_generic_method_type_assign() {
-    // TODO(paulberry,ahe): Fasta doesn't support generic method comment syntax.
-    super.test_comment_generic_method_type_assign();
-  }
-
-  @override
-  @failingTest
-  void test_comment_generic_method_type_list() {
-    // TODO(paulberry,ahe): Fasta doesn't support generic method comment syntax.
-    super.test_comment_generic_method_type_list();
-  }
-
-  @override
-  @failingTest
   void test_mismatched_closer() {
     // TODO(paulberry,ahe): Fasta and analyzer recover this error differently.
     // Figure out which recovery technique we want the front end to use.
     super.test_mismatched_closer();
   }
 
   @override
   @failingTest
   void test_mismatched_opener() {
     // TODO(paulberry,ahe): Fasta and analyzer recover this error differently.
@@ skipping 346 matching lines @@
   final ErrorListener _listener;
 
   ToAnalyzerTokenStreamConverter_WithListener(this._listener);
 
   @override
   void reportError(
       ScannerErrorCode errorCode, int offset, List<Object> arguments) {
     _listener.errors.add(new TestError(offset, errorCode, arguments));
   }
 }