{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"//!"}]}
//! a "stability" of an item. So, the stability attribute has an
//! `#[stable(...)]` and `#[unstable()]` cannot occur together, and both semantically define
//! [`AttributeParser`](attributes::AttributeParser) that recognizes both the `#[stable()]`