{"ast_node_type":"variable","tokens":[{"end":74,"kind":"keyword","start":0,"text":"let"}]}
        let discr_layout = self.layout_of(ty.discriminant_ty(*self.tcx))?;
    ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>> {
        let discr_value = match ty.discriminant_for_variant(*self.tcx, variant) {