{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"self.try_eval_bits(tcx,"}]}
        self.try_eval_bits(tcx, typing_env)
    pub fn eval_bits(self, tcx: TyCtxt<'tcx>, typing_env: ty::TypingEnv<'tcx>) -> u128 {
            .unwrap_or_else(|| bug!("expected bits of {:#?}, got {:#?}", self.ty(), self))