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

tests/language_2/function_type/function_type49_test.dart

Index: tests/language_2/function_type/function_type49_test.dart
diff --git a/tests/language_2/function_type/function_type49_test.dart b/tests/language_2/function_type/function_type49_test.dart
index b63ae750d1e9180c91a76e09770a6eedfe14095b..191da6a4297f0dd62d47484db247e390a6a27740 100644
--- a/tests/language_2/function_type/function_type49_test.dart
+++ b/tests/language_2/function_type/function_type49_test.dart
@@ -200,10 +200,10 @@ class U49<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>);
     }
   }