{"ast_node_type":"variable","tokens":[{"end":92,"kind":"keyword","start":0,"text":"let"}]}
                    let (generics, decl) = this.lower_generics(generics, id, itctx, |this| {
                    let itctx = ImplTraitContext::Universal;
                        this.lower_fn_decl(decl, id, *fn_sig_span, FnDeclKind::Fn, coroutine_kind)