deprecated_mixin

Mixing in '{0}' is deprecated.

The analyzer produces this diagnostic when a mixin class annotated with @Deprecated.mixin is used in the with clause of a class or enum declaration. This annotation indicates that using the annotated mixin is deprecated and will soon be removed. This change will likely be enforced by removing the mixin class modifier.

If the library p defines a class annotated with @Deprecated.mixin:

@Deprecated.mixin()
mixin class C {}

Then, in any library other than p, the following code produces this diagnostic:

import 'package:p/p.dart';
​
class D with C {}

Follow any directions found in the Deprecation.mixin annotation. Otherwise, remove the mixin class name from the with clause.

class D {}