invalid_deprecated_subclass_annotation
The annotation '@Deprecated.subclass' can only be applied to subclassable classes and mixins.
Description
#The analyzer produces this diagnostic when anything other than a
subclassable class or mixin is annotated with
Deprecated.subclass. A subclassable
class is a class not declared with the final or sealed keywords. A
subclassable mixin is a mixin not declared with the base keyword.
Example
#The following code produces this diagnostic because the annotation is on a sealed class:
dart
@Deprecated.subclass()
sealed class C {}Common fixes
#Remove the annotation:
dart
sealed class C {}