Support resolution of indexed operators.

tests/compiler/dart2js/resolver_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('dart:uri');
 
 #import("../../../lib/compiler/implementation/leg.dart");
 #import("../../../lib/compiler/implementation/elements/elements.dart");
 #import("../../../lib/compiler/implementation/tree/tree.dart");
+#import("../../../lib/compiler/implementation/scanner/scannerlib.dart");
 #import("../../../lib/compiler/implementation/util/util.dart");
 #import("compiler_helper.dart");
 #import("mock_compiler.dart");
 #import("parser_helper.dart");
 
 Node buildIdentifier(String name) => new Identifier(scan(name));
 
 Node buildInitialization(String name) =>
   parseBodyCode('$name = 1',
       (parser, tokens) => parser.parseOptionallyInitializedIdentifier(tokens));
@@ skipping 46 matching lines @@
   // testTwoInterfaces(); // Generates unexpected error message.
   testFunctionExpression();
   testNewExpression();
   testTopLevelFields();
   testClassHierarchy();
   testInitializers();
   testThis();
   testSuperCalls();
   testTypeVariables();
   testToString();
+  testIndexedOperator();
 }
 
 testTypeVariables() {
   matchResolvedTypes(visitor, text, name, expectedElements) {
     VariableDefinitions definition = parseStatement(text);
     visitor.visit(definition.type);
     InterfaceType type = visitor.mapping.getType(definition.type);
     Expect.equals(definition.type.typeArguments.length(),
                   length(type.arguments));
     int index = 0;
@@ skipping 633 matching lines @@
 
 at(Link link, int index) => (index == 0) ? link.head : at(link.tail, index - 1);
 
 List<String> asSortedStrings(Link link) {
   List<String> result = <String>[];
   for (; !link.isEmpty(); link = link.tail) result.add(link.head.toString());
   result.sort((s1, s2) => s1.compareTo(s2));
   return result;
 }
 
+compileScript(String source) {
+  Uri uri = new Uri.fromComponents(scheme: 'source');
+  MockCompiler compiler = compilerFor(source, uri);
+  compiler.runCompiler(uri);
+  return compiler;
+}
+
 testToString() {
-  Uri uri = new Uri.fromComponents(scheme: 'source');
-  MockCompiler compiler = compilerFor(
-      @"class C { toString() => 'C'; } main() { '${new C()}'; }",
-      uri);
-  compiler.runCompiler(uri);
+  final script = @"class C { toString() => 'C'; } main() { '${new C()}'; }";
+  final compiler = compileScript(script);
 
   Element toStringMethod = findElement(compiler, 'C')
       .lookupLocalMember(buildSourceString('toString'));
   Expect.isNotNull(toStringMethod);
 
   Expect.isNotNull(
       compiler.enqueuer.resolution.getCachedElements(toStringMethod));
 }
+
+testIndexedOperator() {
+  final script = @"""
+      class C {
+        operator[](ix) => ix;
+        operator[]=(ix, v) {}
+      }
+      main() { var c = new C(); c[0]++ ; }""";
+  final compiler = compileScript(script);
+
+  operatorName(op) => Elements.constructOperatorName(
+      const SourceString('operator'), new SourceString(op));
+
+  Element indexedOperator = findElement(compiler, 'C')
+      .lookupLocalMember(operatorName('[]'));
+  Expect.isNotNull(indexedOperator);
+  Expect.isNotNull(
+      compiler.enqueuer.resolution.getCachedElements(indexedOperator));
+
+  Element indexedSetOperator = findElement(compiler, 'C')
+      .lookupLocalMember(operatorName('[]='));
+  Expect.isNotNull(indexedOperator);
+  Expect.isNotNull(
+      compiler.enqueuer.resolution.getCachedElements(indexedSetOperator));
+}