{"ast_node_type":"variable","tokens":[{"end":82,"kind":"keyword","start":0,"text":"let"}]}
        let const_val = val.eval(*self.tcx, self.typing_env, span).map_err(|err| {
    ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>> {
                if M::ALL_CONSTS_ARE_PRECHECKED {