Rust Inherent Pub

Motivation

If you impl a trait on a type, you'll only be able to use the methods in that impl block if you import the trait:

```rust mod geometry { pub trait Length { fn length(&self) -> f64; }

pub struct Vector(pub f64, pub f64);

impl Length for Vector {
    fn length(&self) -> f64 {
        let Vector(x, y) = self;
        (x.powi(2) + y.powi(2)).sqrt()
    }
}

}

fn main() { // Compilation error: we did not use geometry::Length so we can't access length() assert!(geometry::Vector(3.0, 4.0).length() == 5.0); } ```

With #[inherent_pub], we can make it so length() can be used without importing the Length trait - just annotated the impl block and mark the method as pub:

```rust extern crate inherent_pub;

mod geometry { use inherentpub::inherentpub;

pub trait Length {
    fn length(&self) -> f64;
}

pub struct Vector(pub f64, pub f64);

#[inherent_pub]
impl Length for Vector {
    pub fn length(&self) -> f64 {
        let Vector(x, y) = self;
        (x.powi(2) + y.powi(2)).sqrt()
    }
}

}

fn main() { assert!(geometry::Vector(3.0, 4.0).length() == 5.0); } ```