{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"impl<'tcx>"}]}
        impl<'tcx> BoundVarReplacerDelegate<'tcx> for Anonymize<'_, 'tcx> {
        }
            fn replace_region(&mut self, br: ty::BoundRegion) -> ty::Region<'tcx> {