{"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"RegionSubParam(ty::Region<'tcx>,"}]}
    RegionSubParam(ty::Region<'tcx>, ty::ParamTy),
    RegionSubRegion(ty::Region<'tcx>, ty::Region<'tcx>),
    RegionSubAlias(ty::Region<'tcx>, ty::AliasTy<'tcx>),