Fix generic function tests to satisfy analyzer (fixes #27728).

tests/language/generic_methods_generic_function_parameter_test.dart

Index: tests/language/generic_methods_generic_function_parameter_test.dart
diff --git a/tests/language/generic_methods_generic_function_parameter_test.dart b/tests/language/generic_methods_generic_function_parameter_test.dart
index 45014c4edbfbafb79fcb359378b8f25ac07a7142..39922869bde79ee7ec3a4a6cc98da850bb05dd55 100644
--- a/tests/language/generic_methods_generic_function_parameter_test.dart
+++ b/tests/language/generic_methods_generic_function_parameter_test.dart
@@ -7,11 +7,11 @@
 import "package:expect/expect.dart";
 
 class C<T> {
-  bar<V>(T t, int u, V v) => t + u + v;
-  foo<U>(bar<V>(T t, U u, V v)) => bar<int>(1, 2, 3);
+  bar<V>(T t, int u, V v) => t.toString() + u.toString() + v.toString();
+  foo<U>(bar<V>(T t, U u, V v)) => bar<int>(1 as T, 2 as U, 3);
 }
 
 main() {
   var c = new C<int>();
-  Expect.equals(6, c.foo<int>(c.bar));
+  Expect.equals("123", c.foo<int>(c.bar));
 }