Macro ident_str 

ident_str!() { /* proc-macro */ }

The main macro.

Accepts any number of name = <string literal> pairs (or using macros like concat! or stringify!), followed by => and then the body that will be expanded (optionally surrounded by {}).

ident_str::ident_str! {
    #name = "hello_world" =>
    fn #name() -> &'static str {
        stringify!(#name)
    }
}