Remove warnings from dart2js test-suite.

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 241 matching lines @@
   Expect.stringEquals("a", sendSet.receiver.toString());
   Expect.stringEquals("b", sendSet.selector.toString());
   Expect.stringEquals("++", sendSet.assignmentOperator.toString());
   Expect.isTrue(sendSet.arguments.isEmpty);
 }
 
 void testOperatorParse() {
   FunctionExpression function = parseMember('operator -() => null;');
   Send name = function.name.asSend();
   Expect.isNotNull(name);
-  Expect.stringEquals('operator', name.receiver.source);
-  Expect.stringEquals('-', name.selector.source);
+  Expect.stringEquals('operator', name.receiver.toString());
+  Expect.stringEquals('-', name.selector.toString());
   Expect.isTrue(function.parameters.isEmpty);
   Expect.isNull(function.returnType);
   Expect.isNull(function.getOrSet);
 }
 
 class Collector implements DiagnosticListener {
   int token = -1;
 
   void reportFatalError(Token token,
                         messageKind,
                         [Map arguments = const {}]) {
     this.token = token.kind;
     throw this;
   }
 
   void reportError(Token token,
                    messageKind,
                    [Map arguments = const {}]) {
     reportFatalError(token, messageKind, arguments);
   }
 
   void log(message) {
     print(message);
   }
+
+  noSuchMethod(Invocation invocation) => throw 'unsupported operation';
 }
 
 void testMissingCloseParen() {
   final String source =
 '''foo(x {  // <= missing closing ")"
   return x;
 }''';
   parse() {
     parseMember(source, diagnosticHandler: new Collector());
   }
@@ skipping 39 matching lines @@
   testWhileStatement();
   testConditionalExpression();
   testAssignment();
   testIndex();
   testPostfix();
   testOperatorParse();
   testMissingCloseParen();
   testMissingCloseBraceInClass();
   testUnmatchedAngleBracket();
 }