{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"//"}]}
        // excludes closures, which are allowed to have `_` in their return type.
        // Note that we use `Node::fn_sig` instead of `Node::fn_decl` here, because the former
        let hir_node = tcx.hir_node_by_def_id(item_def_id);