Revert "fix #30462, update function_type tests to understand covariant generics"

tests/language_2/function_type/function_type8_test.dart

Index: tests/language_2/function_type/function_type8_test.dart
diff --git a/tests/language_2/function_type/function_type8_test.dart b/tests/language_2/function_type/function_type8_test.dart
index 3a41b6aab3d68c0255b43d28d59c74b858588843..2a03708d062f2b9c369fd7c523d53181d61a6c4e 100644
--- a/tests/language_2/function_type/function_type8_test.dart
+++ b/tests/language_2/function_type/function_type8_test.dart
@@ -221,10 +221,10 @@ class U8<T> {
       });
     }
     if (tIsInt || tIsBool) {
-      Expect.equals(true, m1 is F1<int>);
-      Expect.equals(true, m1 is F1<bool>);
-      Expect.equals(true, confuse(m1) is F1<int>);
-      Expect.equals(true, confuse(m1) is F1<bool>);
+      Expect.equals(tIsInt, m1 is F1<int>);
+      Expect.equals(tIsBool, m1 is F1<bool>);
+      Expect.equals(tIsInt, confuse(m1) is F1<int>);
+      Expect.equals(tIsBool, confuse(m1) is F1<bool>);
     }
   }