Function eval_bin

enumset_derive/src/const_eval.rs:39–45

(binary: &ExprBinary, op: impl FnOnce(i64, i64) -> Option<i64>)

}

fn eval_bin(binary: &ExprBinary, op: impl FnOnce(i64, i64) -> Option<i64>) -> syn::Result<i64> {
    let result = op(eval_literal(&binary.left)?, eval_literal(&binary.right)?);
    match result {
        None => error(binary.span(), "Error while evaluating discriminant."),
        Some(x) => Ok(x),
    }
}