{"ast_node_type":"variable","tokens":[{"end":45,"kind":"keyword","start":0,"text":"let"}]}
        let trait_def_id = match self.mutbl {
    pub fn method_call<'tcx>(&self, tcx: TyCtxt<'tcx>) -> DefId {
            hir::Mutability::Not => tcx.require_lang_item(LangItem::Deref, self.span),