{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"cnst.try_eval_target_usize(self.tcx,"}]}
        cnst.try_eval_target_usize(self.tcx, self.fully_monomorphized())
        use crate::context::TypingEnvHelpers;
            .ok_or_else(|| B::Error::new(format!("Const `{cnst:?}` cannot be encoded as u64")))