{"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
                let pat_ty = match self.lower_pat_ty_pat(ty, ty_span, pat) {
                let ty = self.lower_ty(ty);
                    Ok(kind) => Ty::new_pat(tcx, ty, tcx.mk_pat(kind)),