invalid_deprecated_instantiate_annotation

The annotation '@Deprecated.instantiate' can only be applied to classes.

The analyzer produces this diagnostic when the @Deprecated.instantiate annotation is applied to a declaration that isn't an instantiable class. An instantiable class is one that isn't declared with the abstract or sealed keywords and has at least one public, generative constructor.

The following code produces this diagnostic because the annotation is on a sealed class:

@Deprecated.instantiate()
sealed class C {}

Remove the annotation:

sealed class C {}