Fix bug in inferrer for the computation of callers: we need to keep track of what is the called nod…

tests/compiler/dart2js/simple_inferrer_callers_test.dart

+// Copyright (c) 2013, 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.
+
+// Test that computation of callers of an element works when two
+// elements of the same name are being invoked in the same method.
+
+import 'package:expect/expect.dart';
+import "package:async_helper/async_helper.dart";
+import '../../../sdk/lib/_internal/compiler/implementation/types/types.dart';
+import '../../../sdk/lib/_internal/compiler/implementation/types/simple_types_inferrer.dart';
+
+import 'compiler_helper.dart';
+import 'parser_helper.dart';
+
+const String TEST = """
+class A {
+  var field;
+}
+
+class B {
+  var field;
+}
+
+main() {
+  new A().field;
+  new B().field;
+}
+""";
+
+// Create our own type inferrer to avoid clearing out the internal
+// data structures.
+class MyInferrer extends SimpleTypesInferrer {
+  MyInferrer(compiler) : super(compiler);
+  clear() {}
+}
+
+void main() {
+  Uri uri = new Uri(scheme: 'source');
+  var compiler = compilerFor(TEST, uri);
+  var inferrer = new MyInferrer(compiler);
+  compiler.typesTask.typesInferrer = inferrer;
+  asyncTest(() => compiler.runCompiler(uri).then((_) {
+    var mainElement = findElement(compiler, 'main');
+    var classA = findElement(compiler, 'A');
+    var fieldA = classA.lookupLocalMember(buildSourceString('field'));
+    var classB = findElement(compiler, 'B');
+    var fieldB = classB.lookupLocalMember(buildSourceString('field'));;
+
+    Expect.isTrue(inferrer.getCallersOf(fieldA).contains(mainElement));
+    Expect.isTrue(inferrer.getCallersOf(fieldB).contains(mainElement));
+  }));
+}