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# `unboxed_closures`
The tracking issue for this feature is [#29625]
See Also: [`fn_traits`](../library-features/fn-traits.md)
[#29625]: https://github.com/rust-lang/rust/issues/29625
----
The `unboxed_closures` feature allows you to write functions using the `"rust-call"` ABI,
required for implementing the [`Fn*`] family of traits. `"rust-call"` functions must have
exactly one (non self) argument, a tuple representing the argument list.
[`Fn*`]: https://doc.rust-lang.org/std/ops/trait.Fn.html
```rust
#![feature(unboxed_closures)]
extern "rust-call" fn add_args(args: (u32, u32)) -> u32 {
args.0 + args.1
}
fn main() {}
```
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