{"ast_node_type":"function","tokens":[{"end":88,"kind":"keyword","start":0,"text":"pub"}]}
    pub fn check_const_stability(self, def_id: DefId, span: Span, const_kw_span: Span) {
    /// syntax positions in HIR (including in the trait of an impl header).
        let is_staged_api = self.lookup_stability(def_id.krate.as_def_id()).is_some();