[rustc.git] / src / doc / unstable-book / src / library-features / concat-idents.md

# `concat_idents`

The tracking issue for this feature is: [#29599]

[#29599]: https://github.com/rust-lang/rust/issues/29599

------------------------

The `concat_idents` feature adds a macro for concatenating multiple identifiers
into one identifier.

## Examples

```rust
#![feature(concat_idents)]

fn main() {
    fn foobar() -> u32 { 23 }
    let f = concat_idents!(foo, bar);
    assert_eq!(f(), 23);
}
```
Commit	Line	Data
cc61c64b XL	1	# `concat_idents`
	2
	3	The tracking issue for this feature is: [#29599]
	4
	5	[#29599]: https://github.com/rust-lang/rust/issues/29599
	6
	7	------------------------
	8
	9	The `concat_idents` feature adds a macro for concatenating multiple identifiers
	10	into one identifier.
	11
	12	## Examples
	13
	14	```rust
	15	#![feature(concat_idents)]
	16
	17	fn main() {
	18	fn foobar() -> u32 { 23 }
	19	let f = concat_idents!(foo, bar);
	20	assert_eq!(f(), 23);
	21	}
6a06907d	22	```