# `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); } ```