mute/mute-interpreter/src/macros.rs

// TODO: argument count checking should happen at parse time, not at runtime
#[macro_export]
macro_rules! arg_count {
    ($expected:expr, $given:expr) => {
        if $expected != $given {
            return Node::Error(format!("expected {} arg(s), got {}", $expected, $given));
        }
    };

    (modulo: $modulo:expr, $given:expr) => {
        if $given % $modulo != 0 {
            return Node::Error(format!(
                "expected {} arg(s), got {}",
                ($given / $modulo) * $modulo + $modulo,
                $given,
            ));
        }
    };
}

pub(crate) use arg_count;