{"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"match"}]}
        match (a.kind(), b.kind()) {
    fn lub_concrete_regions(&self, a: Region<'tcx>, b: Region<'tcx>) -> Region<'tcx> {
            (ReBound(..), _) | (_, ReBound(..)) | (ReErased, _) | (_, ReErased) => {