{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"this.lower_fn_decl(&sig.decl,"}]}
            this.lower_fn_decl(&sig.decl, id, sig.span, kind, coroutine_kind)
        let (generics, decl) = self.lower_generics(generics, id, itctx, |this| {
        });