@ -699,7 +699,7 @@ impl<'s, S: Storage<'s>> Db<S> {
/// Unregister a custom fixed rule implementation.
pub fn unregister_fixed_rule(&self, name: &str) -> Result<bool> {
if "Constant" == name {
if DEFAULT_FIXED_RULES.contains_key(name) {
bail!("Cannot unregister builtin fixed rule {}", name);
}
Ok(self.fixed_rules.write().unwrap().remove(name).is_some())