{"ast_node_type":"import","tokens":[{"end":45,"kind":"keyword","start":0,"text":"use"}]}
        use crate::context::TypingEnvHelpers;
    pub fn eval_target_usize(&self, cnst: MirConst<'tcx>) -> Result<u64, B::Error> {
        cnst.try_eval_target_usize(self.tcx, self.fully_monomorphized())