test rename overhaul: step 8 - language tests

tests/language/src/ImplicitThisTest.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.
-
-interface Interface {
-  final x;
-}
-
-// The abstract keyword is implicit if a class declares an abstract
-// member. This class does not declare any abstract members, so it
-// must be marked abstract because it doesn't implement the x getter.
-abstract class Abstract implements Interface {
-  String toString() => x.toString();
-}
-
-// This class does not implement "x" either, but it is not marked
-// abstract.
-class SubAbstract1 extends Abstract { } /// 01: static type warning
-
-// This class is implicitly abstract as it declares an abstract getter
-// method.
-class SubAbstract2 extends Abstract {
-  abstract get x();
-}
-
-// This class does not implement "x" either, but it is not marked
-// abstract.
-class SubSubAbstract2 extends SubAbstract2 { } /// 04: static type warning
-
-class Concrete extends Abstract {
-  get x() => 7;
-}
-
-class SubConcrete extends Concrete {
-  final x;
-  SubConcrete(this.x);
-}
-
-void main() {
-  var x = new Abstract(); /// 02: static type warning
-  var y = new SubAbstract1(); /// 01: continued
-  var z = new SubAbstract2(); /// 03: static type warning
-  var a = new SubSubAbstract2(); /// 04: continued
-  Expect.equals(x, x); /// 02: continued
-  Expect.equals('7', new Concrete().toString());
-  Expect.equals('42', new SubConcrete(42).toString());
-  Expect.equals('7', new SubConcrete(new Concrete()).toString());
-}