{"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
        let variadic = if fn_sig.c_variadic() { ", ..." } else { "" };
        let num_args = fn_sig.inputs().map_bound(|inputs| inputs.len()).skip_binder();
        let ret = if fn_sig.output().skip_binder().is_unit() { "" } else { " -> _" };