Revert "Support runtime check of function types."

tests/language/function_subtype1_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.
-// Dart test program for constructors and initializers.
-
-// Check function subtyping.
-
-import 'package:expect/expect.dart';
-
-class C<T> {}
-
-typedef _();
-typedef void void_();
-typedef void void_2();
-typedef int int_();
-typedef int int_2();
-typedef Object Object_();
-typedef double double_();
-typedef void void__int(int i);
-typedef int int__int(int i);
-typedef int int__int2(int i);
-typedef int int__Object(Object o);
-typedef Object Object__int(int i);
-typedef int int__double(double d);
-typedef int int__int_int(int i1, int i2);
-typedef void inline_void_(void f());
-typedef void inline_void__int(void f(int i));
-
-main() {
-  // () -> int <: Function
-  Expect.isTrue(new C<int_>() is C<Function>);
-  // Function <: () -> int
-  Expect.isFalse(new C<Function>() is C<int_>);
-  // () -> dynamic <: () -> dynamic
-  Expect.isTrue(new C<_>() is C<_>);
-  // () -> dynamic <: () -> void
-  Expect.isTrue(new C<_>() is C<void_>);
-  // () -> void <: () -> dynamic
-  Expect.isTrue(new C<void_>() is C<_>);
-  // () -> int <: () -> void
-  Expect.isTrue(new C<int_>() is C<void_>);
-  // () -> void <: () -> int
-  Expect.isFalse(new C<void_>() is C<int_>);
-  // () -> void <: () -> void
-  Expect.isTrue(new C<void_>() is C<void_2>);
-  // () -> int <: () -> int
-  Expect.isTrue(new C<int_>() is C<int_2>);
-  // () -> int <: () -> Object
-  Expect.isTrue(new C<int_>() is C<Object_>);
-  // () -> int <: () -> double
-  Expect.isFalse(new C<int_>() is C<double_>);
-  // () -> int <: (int) -> void
-  Expect.isFalse(new C<int_>() is C<void__int>);
-  // () -> void <: (int) -> int
-  Expect.isFalse(new C<void_>() is C<int__int>);
-  // () -> void <: (int) -> void
-  Expect.isFalse(new C<void_>() is C<void__int>);
-  // (int) -> int <: (int) -> int
-  Expect.isTrue(new C<int__int>() is C<int__int2>);
-  // (Object) -> int <: (int) -> Object
-  Expect.isTrue(new C<int__Object>() is C<Object__int>);
-  // (int) -> int <: (double) -> int
-  Expect.isFalse(new C<int__int>() is C<int__double>);
-  // () -> int <: (int) -> int
-  Expect.isFalse(new C<int_>() is C<int__int>);
-  // (int) -> int <: (int,int) -> int
-  Expect.isFalse(new C<int__int>() is C<int__int_int>);
-  // (int,int) -> int <: (int) -> int
-  Expect.isFalse(new C<int__int_int>() is C<int__int>);
-  // (()->void) -> void <: ((int)->void) -> void
-  Expect.isFalse(new C<inline_void_>() is C<inline_void__int>);
-  // ((int)->void) -> void <: (()->void) -> void
-  Expect.isFalse(new C<inline_void__int>() is C<inline_void_>);
-}