{"ast_node_type":"variable","tokens":[{"end":50,"kind":"keyword","start":0,"text":"let"}]}
        let mut tables = self.tables.borrow_mut();
    fn try_new_ty_const_uint(&self, value: u128, uint_ty: UintTy) -> Result<TyConst, Error> {
        let cx = &*self.cx.borrow();