Fix parser in case of unmatched angle bracket.

tests/compiler/dart2js/parser_test.dart

 // Copyright (c) 2011, 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:expect/expect.dart";
 import 'parser_helper.dart';
 import '../../../sdk/lib/_internal/compiler/implementation/tree/tree.dart';
 
 void testStatement(String statement) {
   Node node = parseStatement(statement);
@@ skipping 288 matching lines @@
   parse() {
     fullParseUnit(source, diagnosticHandler: new Collector());
   }
   check(Collector c) {
     Expect.equals(EOF_TOKEN, c.token);
     return true;
   }
   Expect.throws(parse, check);
 }
 
+void testUnmatchedAngleBracket() {
+  final String source = 'A<'; // unmatched '<'
+  parse() {
+    fullParseUnit(source, diagnosticHandler: new Collector());
+  }
+  check(Collector c) {
+    Expect.equals(LT_TOKEN, c.token);
+    return true;
+  }
+  Expect.throws(parse, check);
+}
+
 void main() {
   testGenericTypes();
   // TODO(ahe): Enable this test when we handle library prefixes.
   // testPrefixedGenericTypes();
   testUnaryExpression();
   testChainedMethodCalls();
   testFunctionStatement();
   testDoStatement();
   testWhileStatement();
   testConditionalExpression();
   testAssignment();
   testIndex();
   testPostfix();
   testOperatorParse();
   testMissingCloseParen();
   testMissingCloseBraceInClass();
+  testUnmatchedAngleBracket();
 }