whichever 0.7.1

Implements a trait for an enum by forwarding to whichever variant it holds
Documentation 
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#[whichever::dispatchable]
trait Merge {
    fn merge(&self, other: Option<&Self>) -> u32;
}

struct A(u32);
struct B(u32);

impl Merge for A {
    fn merge(&self, other: Option<&Self>) -> u32 {
        self.0 + other.map_or(0, |other| other.0)
    }
}

impl Merge for B {
    fn merge(&self, other: Option<&Self>) -> u32 {
        self.0 + other.map_or(0, |other| other.0)
    }
}

#[whichever::dispatch(Merge)]
enum Kind {
    A(A),
    B(B),
}

fn main() {}