{"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
                    let inferred_fnptr_sig = Ty::new_fn_ptr(self.tcx, inferred_sig.sig);
                    let generalized_fnptr_sig = self.next_ty_var(span);
                    self.demand_eqtype(span, inferred_fnptr_sig, generalized_fnptr_sig);