{"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"pub"}]}
    pub types: &'a mut (dyn FnMut(ty::BoundTy) -> Ty<'tcx> + 'a),
    pub regions: &'a mut (dyn FnMut(ty::BoundRegion) -> ty::Region<'tcx> + 'a),
    pub consts: &'a mut (dyn FnMut(ty::BoundConst) -> ty::Const<'tcx> + 'a),