whichever 0.7.1

Implements a trait for an enum by forwarding to whichever variant it holds
Documentation 
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//! A dispatch struct needs a field.
#[whichever::dispatchable]
trait Shape {
    fn area(&self) -> u32;
}

struct Circle(u32);

impl Shape for Circle {
    fn area(&self) -> u32 {
        self.0
    }
}

#[whichever::dispatch(Shape)]
struct Unit;

fn main() {}