Re-land "fix #30462, update function_type tests to understand covariant generics"

tests/language_2/function_type/function_type54_test.dart

Index: tests/language_2/function_type/function_type54_test.dart
diff --git a/tests/language_2/function_type/function_type54_test.dart b/tests/language_2/function_type/function_type54_test.dart
index 02b23e2e7258d6b3525372e3b98bbd684a752d8e..30f30c35614f000f1d4d325dafa8a405ad973f1d 100644
--- a/tests/language_2/function_type/function_type54_test.dart
+++ b/tests/language_2/function_type/function_type54_test.dart
@@ -212,10 +212,10 @@ class U54<T> {
       });
     }
     if (tIsInt || tIsBool) {
-      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>);
+      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>);
     }
   }