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

tests/language/generic_methods_new_test.dart

Index: tests/language/generic_methods_new_test.dart
diff --git a/tests/language/generic_methods_new_test.dart b/tests/language/generic_methods_new_test.dart
index ea23b949d91dcf095a20b2964ef396bdb0bd25ff..d0acd0a8d19b5f341924f470cc0148e7aa856ded 100644
--- a/tests/language/generic_methods_new_test.dart
+++ b/tests/language/generic_methods_new_test.dart
@@ -21,6 +21,8 @@ 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!");
@@ -28,4 +30,9 @@ main() {
   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]);
 }