fix #30423, covariant parameter tearoff type should be Object

tests/language_strong/function_subtype_not1_test.dart

Index: tests/language_strong/function_subtype_not1_test.dart
diff --git a/tests/language_strong/function_subtype_not1_test.dart b/tests/language_strong/function_subtype_not1_test.dart
index 13227a177468214d4816b03b4c83c8741683de38..431bb765ae5ce7187779fae9598bdd649c9112ab 100644
--- a/tests/language_strong/function_subtype_not1_test.dart
+++ b/tests/language_strong/function_subtype_not1_test.dart
@@ -21,12 +21,12 @@ void main() {
   Expect.isFalse(new Class().bar is! Bar);
 
   Expect.isFalse(new Class<int>().bar is! Foo);
-  Expect.isTrue(new Class<int>().bar is! Foo<bool>);
+  Expect.isFalse(new Class<int>().bar is! Foo<bool>);
   Expect.isFalse(new Class<int>().bar is! Foo<int>);
   Expect.isFalse(new Class<int>().bar is! Bar);
 
   Expect.isFalse(new Class<bool>().bar is! Foo);
   Expect.isFalse(new Class<bool>().bar is! Foo<bool>);
-  Expect.isTrue(new Class<bool>().bar is! Foo<int>);
-  Expect.isTrue(new Class<bool>().bar is! Bar);
+  Expect.isFalse(new Class<bool>().bar is! Foo<int>);
+  Expect.isFalse(new Class<bool>().bar is! Bar);
 }