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

tests/language_2/function_type/function_type30_test.dart

Index: tests/language_2/function_type/function_type30_test.dart
diff --git a/tests/language_2/function_type/function_type30_test.dart b/tests/language_2/function_type/function_type30_test.dart
index 19c92cc113263cb3e02811f8484ddb0fbcd8d2bd..2566334102e790a17c8d28876ffebdbc1d995cf4 100644
--- a/tests/language_2/function_type/function_type30_test.dart
+++ b/tests/language_2/function_type/function_type30_test.dart
@@ -318,10 +318,10 @@ class U30<T> {
       });
     }
     if (tIsInt || tIsBool) {
-      Expect.equals(tIsInt, m3 is F3<int>);
-      Expect.equals(tIsBool, m3 is F3<bool>);
-      Expect.equals(tIsInt, confuse(m3) is F3<int>);
-      Expect.equals(tIsBool, confuse(m3) is F3<bool>);
+      Expect.equals(true, m3 is F3<int>);
+      Expect.equals(true, m3 is F3<bool>);
+      Expect.equals(true, confuse(m3) is F3<int>);
+      Expect.equals(true, confuse(m3) is F3<bool>);
     }
   }