Add test case for type with partial parameterization by method type parameter

tests/language/generic_methods_new_test.dart

 // Copyright (c) 2016, 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.
 //
 // DartOptions=--generic-method-syntax
 
 /// Dart test on the usage of method type arguments in object creation. With
 /// '--generic-method-syntax', the type argument is available at runtime,
 /// but erased to `dynamic`.
 
 library generic_methods_new_test;
 
 import "package:expect/expect.dart";
 
 class C<E> {
   E e;
   C(this.e);
 }
 
 C<T> f1<T>(T t) => new C<T>(t);
 
 List<T> f2<T>(T t) => <T>[t];
 
+Map<T, String> f3<T>(T t) => <T, String>{t: 'hi'};
+
 main() {
   C c = f1<int>(42);
   List i = f2<String>("Hello!");
   Expect.isTrue(c is C<int> && c is C<String>); // C<dynamic>.
   Expect.isTrue(i is List<String> && i is List<int>); // List<dynamic>.
   Expect.equals(c.e, 42);
   Expect.equals(i[0], "Hello!");
+
+  Map m1 = f3<int>(1);
+  Expect.isTrue(m1 is Map<int, String> && m1 is Map<String, String>);
+  Expect.isFalse(m1 is Map<int, int>);
+  Expect.equals('hi', m1[1]);
 }