{"ast_node_type":"other","tokens":[{"end":27,"kind":"keyword","start":0,"text":"sig.map_bound(|s|"}]}
        sig.map_bound(|s| {
    pub fn signature_unclosure(self, sig: PolyFnSig<'tcx>, safety: hir::Safety) -> PolyFnSig<'tcx> {
            let params = match s.inputs()[0].kind() {