{"ast_node_type":"impl","tokens":[{"end":75,"kind":"keyword","start":0,"text":"///"}]}
    /// syntax positions in HIR (including in the trait of an impl header).
    /// it enforces the ability to name `[const]`/`const` traits in trait bounds in various
    pub fn check_const_stability(self, def_id: DefId, span: Span, const_kw_span: Span) {