tests/compiler/dart2js/list_tracer2_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.

// We used to always nullify the element type of a list we are tracing in
// the presence of a fixed length list constructor call.

import 'package:expect/expect.dart';
import
    '../../../sdk/lib/_internal/compiler/implementation/types/types.dart'
    show ContainerTypeMask, TypeMask;

import 'compiler_helper.dart';
import 'parser_helper.dart';


const String TEST = r'''
var myList = [42];
main() {
  var a = new List(42);
  return myList[0];
}
''';

void main() {
  Uri uri = new Uri(scheme: 'source');
  var compiler = compilerFor(TEST, uri);
  compiler.runCompiler(uri);
  var typesInferrer = compiler.typesTask.typesInferrer;

  checkType(String name, type) {
    var element = findElement(compiler, name);
    ContainerTypeMask mask = typesInferrer.getTypeOfElement(element);
    Expect.equals(type, mask.elementType.simplify(compiler), name);
  }

  checkType('myList', compiler.typesTask.intType);
}