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

tests/language_2/function_type/function_type47_test.dart

Index: tests/language_2/function_type/function_type47_test.dart
diff --git a/tests/language_2/function_type/function_type47_test.dart b/tests/language_2/function_type/function_type47_test.dart
index 2f457752fabd9673380916e8447d23a10f1017cd..c4be334556d219e496b50ac72f93e7b5dc80ce7e 100644
--- a/tests/language_2/function_type/function_type47_test.dart
+++ b/tests/language_2/function_type/function_type47_test.dart
@@ -241,10 +241,10 @@ class U47<T> {
       });
     }
     if (tIsInt || tIsBool) {
-      Expect.equals(true, m0 is F0<int>);
-      Expect.equals(true, m0 is F0<bool>);
-      Expect.equals(true, confuse(m0) is F0<int>);
-      Expect.equals(true, confuse(m0) is F0<bool>);
+      Expect.equals(tIsInt, m0 is F0<int>);
+      Expect.equals(tIsBool, m0 is F0<bool>);
+      Expect.equals(tIsInt, confuse(m0) is F0<int>);
+      Expect.equals(tIsBool, confuse(m0) is F0<bool>);
     }
   }