{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":")"}]}
    ) -> Option<(LocalDefId, &'tcx hir::FnDecl<'tcx>)> {
        blk_id: HirId,
        // Get enclosing Fn, if it is a function or a trait method, unless there's a `loop` or