Attribute Macro extension_trait

#[extension_trait]

Declares an extension trait

Example

#[macro_use]
extern crate extension_trait;

#[extension_trait]
pub impl DoubleExt for str {
   fn double(&self) -> String {
       self.repeat(2)
   }
}

fn main() {
    assert_eq!("Hello".double(), "HelloHello");
}