rl_lang/interpreter/stdlib/result/is_err.rs
1use crate::{
2 interpreter::{evaluator::Evaluator, stdlib::common::check_arity, values::Value},
3 utils::{errors::Error, span::Span},
4};
5
6pub fn func(_: &mut Evaluator, args: Vec<Value>, span: Span) -> Result<Value, Error> {
7 check_arity(&args, 1, "is_err", span)?;
8 Ok(Value::Bool(args[0].is_err()))
9}