fn eval, r: Value anyhow::Result>()

in starlark/src/eval/bc/instr_impl.rs [738:753]

• 15 lines of code
• 7 McCabe index (conditional complexity)

    fn eval<'v>(l: Value<'v>, r: Value<'v>, heap: &'v Heap) -> anyhow::Result<Value<'v>> {
        // Addition of string is super common and pretty cheap, so have a special case for it.
        if let Some(ls) = l.unpack_str() {
            if let Some(rs) = r.unpack_str() {
                if ls.is_empty() {
                    return Ok(r);
                } else if rs.is_empty() {
                    return Ok(l);
                } else {
                    return Ok(heap.alloc_str_concat(ls, rs).to_value());
                }
            }
        }

        l.add(r, heap)
    }