{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
        let num_args = fn_sig.inputs().map_bound(|inputs| inputs.len()).skip_binder();
        let params = ty_params.chain(const_params).join(", ");
        let variadic = if fn_sig.c_variadic() { ", ..." } else { "" };