Add ClassMirror.isAbstract to the API and VM implementation.

tests/lib/mirrors/abstract_class_test.dart

+// Copyright (c) 2014, 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.
+
+library test.abstract_class_test;
+
+import 'dart:mirrors';
+import 'package:expect/expect.dart';
+
+abstract class Foo {
+  foo();
+}
+class Bar extends Foo {
+  foo() {}
+}
+
+abstract class FunctionFoo implements Function {
+  call();
+}
+class FunctionBar extends FunctionFoo {
+  call() {}
+}
+
+abstract class GenericFoo<T> {
+  T genericFoo();
+}
+class GenericBar<T> extends GenericFoo<T> {
+  T genericFoo() {}
+}
+
+void main() {
+  // FunctionTypeMirror
+  baz() {}
+  Expect.isFalse(reflect(baz).type.isAbstract);
+
+  return;  /// 01: ok
+
+  // Unbound ClassMirror
+  Expect.isTrue(reflectClass(Foo).isAbstract);
+  Expect.isFalse(reflectClass(Bar).isAbstract);
+  Expect.isTrue(reflectClass(FunctionFoo).isAbstract);
+  Expect.isFalse(reflectClass(FunctionBar).isAbstract);
+  Expect.isTrue(reflect(new FunctionBar()).type.superclass.isAbstract);
+  Expect.isFalse(reflect(new FunctionBar()).type.isAbstract);

[gbracha, 2014/01/08 21:33:24]

Why is there no analog for this with Bar? viz.

Expect.isTrue(reflect(new Bar().type.superclass.isAbstract);

etc. Likewise the generic case?

[rmacnak, 2014/01/08 21:53:56]

Added. The important thing is really to test with instantiated generics because
dart2js gives them a different representation.

+
+  // Bound ClassMirror
+  Expect.isTrue(reflect(new GenericBar<int>()).type.superclass.isAbstract);
+  Expect.isFalse(reflect(new GenericBar<int>()).type.isAbstract);
+}