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

tests/language_2/function_type/function_type29_test.dart

Index: tests/language_2/function_type/function_type29_test.dart
diff --git a/tests/language_2/function_type/function_type29_test.dart b/tests/language_2/function_type/function_type29_test.dart
index 7a2352e3812bdfc8cd9f25ba1364b8a4b34ce733..0409edc705dfee0b09430bbad837f96f106cfb14 100644
--- a/tests/language_2/function_type/function_type29_test.dart
+++ b/tests/language_2/function_type/function_type29_test.dart
@@ -297,10 +297,10 @@ class U29<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>);
     }
   }