Macro function 

macro_rules! function {
    () => { ... };
}

Expands to a string literal of the current function’s name similar to the venerable file! or line! https://github.com/rust-lang/rfcs/pull/1719.

Examples

use fungus::prelude::*;

fn my_func() -> &'static str {
    function!()
}
assert_eq!(my_func(), "my_func");