Substitute types in instances of generic classes.

tests/lib/mirrors/regress_14304_test.dart

Index: tests/lib/mirrors/regress_14304_test.dart
diff --git a/tests/language/vm/reflect_core_vm_test.dart b/tests/lib/mirrors/regress_14304_test.dart
similarity index 56%
copy from tests/language/vm/reflect_core_vm_test.dart
copy to tests/lib/mirrors/regress_14304_test.dart
index 2474b216f7bf0b641535f0b18af4573eb9c7e723..e63cae08dcfd46e7652246732cff0295dddf0608 100644
--- a/tests/language/vm/reflect_core_vm_test.dart
+++ b/tests/lib/mirrors/regress_14304_test.dart
@@ -2,14 +2,19 @@
 // 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.
 
-// Test reflection of private functions in core classes.
+// Regression test for Issue 14304.
 
-import "package:expect/expect.dart";
 import "dart:mirrors";
+import "package:expect/expect.dart";
 
-main() {
-  var s = "string";
-  var im = reflect(s);
-  Expect.throws(() => im.invoke(const Symbol("_setAt"), [0, 65]), (e) => e is NoSuchMethodError);
+class A<T> {
+  T m() {}
 }
 
+main() {
+  ClassMirror a = reflectClass(A);
+  TypeVariableMirror t = a.typeVariables[0];
+  MethodMirror m = a.methods.values.single;
+  
+  Expect.equals(t, m.returnType);
+}