# `#[function_name]`
Function attribute that generates a `function_name!` macro
in the scope of the function's body.
The generated `function_name!()` is a macro that expands to
the name of the annotated function, as a string literal.
## Examples
```rust
use ::function_name::function_name;
#[function_name]
fn my_super_duper_function ()
{
assert_eq!(
function_name!(),
"my_super_duper_function",
);
}
```
Since the generated `function_name!` expands to a string literal,
it can be used with other macros such as [`concat!`](
https://doc.rust-lang.org/std/macro.concat.html):
```rust
#[macro_use] extern crate function_name;
macro_rules! function_path {() => (concat!(
module_path!(), "::", function_name!()
))}
pub mod foo {
pub mod bar {
#[function_name]
pub fn baz ()
{
assert_eq!(
function_path!(),
[
env!("CARGO_PKG_NAME"),
"foo", "bar",
"baz",
].join("::"),
);
}
}
}
```