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

tests/language_2/function_type/function_type58_test.dart

Index: tests/language_2/function_type/function_type58_test.dart
diff --git a/tests/language_2/function_type/function_type58_test.dart b/tests/language_2/function_type/function_type58_test.dart
index 3c117fdb6b20adcca2451cbc4fce6f553f9ca7a5..d1a162809a65ec1b0cc015d8ef767ae8b5220bd6 100644
--- a/tests/language_2/function_type/function_type58_test.dart
+++ b/tests/language_2/function_type/function_type58_test.dart
@@ -237,10 +237,10 @@ class U58<T> {
       });
     }
     if (tIsInt || tIsBool) {
-      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>);
+      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>);
     }
   }