Report error on only-try block.

pkg/front_end/lib/src/fasta/parser/parser.dart

 // Copyright (c) 2012, 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 fasta.parser.parser;
 
 import '../scanner.dart' show ErrorToken;
 
 import '../scanner/recover.dart' show closeBraceFor, skipToEof;
 
@@ skipping 3469 matching lines @@
       ++catchCount;
       listener.handleCatchBlock(onKeyword, catchKeyword);
       value = token.stringValue; // while condition
     }
 
     Token finallyKeyword = null;
     if (optional('finally', token)) {
       finallyKeyword = token;
       token = parseBlock(token.next);
       listener.handleFinallyBlock(finallyKeyword);
+    } else {
+      if (catchCount == 0) {
+        reportRecoverableError(tryKeyword, ErrorKind.OnlyTry);
+      }
     }
     listener.endTryStatement(catchCount, tryKeyword, finallyKeyword);
     return token;
   }
 
   Token parseSwitchStatement(Token token) {
     assert(optional('switch', token));
     Token switchKeyword = token;
     listener.beginSwitchStatement(switchKeyword);
     token = parseParenthesizedExpression(token.next);
@@ skipping 201 matching lines @@
         break;
     }
     if (isRecoverable) {
       listener.handleRecoverableError(token, kind, arguments);
       return null;
     } else {
       return listener.handleUnrecoverableError(token, kind, arguments);
     }
   }
 }