{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"#[diag(passes_unstable_attr_for_already_stable_feature)]"}]}
#[diag(passes_unstable_attr_for_already_stable_feature)]
#[derive(Diagnostic)]
pub(crate) struct UnstableAttrForAlreadyStableFeature {