{"ast_node_type":"function","tokens":[{"end":100,"kind":"keyword","start":0,"text":"pub"}]}
    pub fn signature_unclosure(self, sig: PolyFnSig<'tcx>, safety: hir::Safety) -> PolyFnSig<'tcx> {
    /// It cannot convert a closure that requires unsafe.
        sig.map_bound(|s| {