{"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"expected_trait:"}]}
        expected_trait: Option<&'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>>,
        ptr: Pointer<Option<M::Provenance>>,
    ) -> InterpResult<'tcx, Ty<'tcx>> {