{"ast_node_type":"variable","tokens":[{"end":48,"kind":"keyword","start":0,"text":"let"}]}
        let ty = tcx.type_of(self.def.def_id());
    pub fn ty(&self, tcx: TyCtxt<'tcx>, typing_env: ty::TypingEnv<'tcx>) -> Ty<'tcx> {
        tcx.instantiate_and_normalize_erasing_regions(self.args, typing_env, ty)