# A very simple macro that clones a list of variables before calling an expression
[](https://github.com/r3v2d0g/clone-block/blob/main/LICENSE.txt) [](https://crates.io/crates/clone-block) [](https://docs.rs/clone-block)
Based on this tweet: <https://twitter.com/untitaker/status/1299812136202493953>
```rust
use clone_block::clone;
use std::thread;
let foo = "foo".to_string();
let thread = thread::spawn(
clone!(foo; move || {
let foobar = format!("{}bar", foo);
foobar
})
);
let foobar = thread.join();
let foobaz = format!("{}baz", foo);
```
## License
> This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at <http://mozilla.org/MPL/2.0/>.