fix #30423, covariant parameter tearoff type should be Object

tests/language_strong/function_type_alias2_test.dart

Index: tests/language_strong/function_type_alias2_test.dart
diff --git a/tests/language_strong/function_type_alias2_test.dart b/tests/language_strong/function_type_alias2_test.dart
index f3302ec56ac3c2fd4238caf99611a0b63a3f5e1f..40c80aea1a2daeef37f3dc0b84cf3b93ebab212a 100644
--- a/tests/language_strong/function_type_alias2_test.dart
+++ b/tests/language_strong/function_type_alias2_test.dart
@@ -42,12 +42,14 @@ main() {
   Expect.isFalse(a.bar is f1);
   Expect.isTrue(a.bar is f3);
   Expect.isTrue(a.baz is f1);
+  Expect.isTrue(a.baz is f1<Object>);
+  Expect.isTrue(a.bar is f3<Object>);
   Expect.isTrue(a.baz is f1<int>);
   Expect.isTrue(a.bar is f3<int>);
-  Expect.isFalse(a.baz is f1<double>);
-  Expect.isFalse(a.bar is f3<double>);
+  Expect.isTrue(a.baz is f1<double>);
+  Expect.isTrue(a.bar is f3<double>);
   Expect.isTrue(a.baz is f2);
   Expect.isFalse(a.bar is f4);
-  Expect.isTrue(a.baz is f2<int>);
-  Expect.isFalse(a.bar is f2<int>);
+  Expect.isTrue(a.baz is f2<Object>);
+  Expect.isFalse(a.bar is f2<Object>);
 }