Add a test for operator[] unparse.

tests/compiler/dart2js/unparser_test.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.
 
+#import('mock_compiler.dart');
 #import('parser_helper.dart');
+#import("../../../lib/compiler/implementation/elements/elements.dart");
 #import("../../../lib/compiler/implementation/tree/tree.dart");
 
 testUnparse(String statement) {
   Node node = parseStatement(statement);
   Expect.equals(statement, node.unparse());
 }
 
 testGenericTypes() {
   testUnparse('var x=new List<List<int>>();');
   testUnparse('var x=new List<List<List<int>>>();');
   testUnparse('var x=new List<List<List<List<int>>>>();');
   testUnparse('var x=new List<List<List<List<List<int>>>>>();');
 }
 
 testForLoop() {
   testUnparse('for(;i<100;i++){}');
   testUnparse('for(i=0;i<100;i++){}');
 }
 
 testEmptyList() {
   testUnparse('var x= [];');
 }
 
+testIndexedOperatorDecl() {
+  MockCompiler compiler = new MockCompiler();

[ahe, 2012/06/19 16:42:45]

Could you use this instead:

Node parseMember(String text) =>
  parseBodyCode(text, (parser, tokens) => parser.parseMember(tokens));

[Anton Muhin, 2012/06/19 18:02:05]

Neat, thanks, done (almost veni, vidi, vici :)

On 2012/06/19 16:42:45, ahe wrote:

+  var elements = parseUnit(
+      'class A { operator[](int i) => null; }',
+      compiler, compiler.mainApp);
+  ClassElement cls = elements.head.ensureResolved(compiler);
+  FunctionElement func = cls.members.head;
+  Node node = func.parseNode(compiler);
+  Expect.equals('operator[](int i)=> null;', '${node}');
+}
+
 main() {
   testGenericTypes();
   testForLoop();
   testEmptyList();
+  testIndexedOperatorDecl();
 }