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Jon Gjengset
c6f9a069a5
`#[derive(Clone)]` on a type `struct Foo<T>` adds an impl that requires that `T: Clone`: ```rust impl<T: Clone> Clone for Foo<T> ``` which is unfortunate in the case of senders, because we don't want to require that the items being sent are `Clone` for the channel sender to be `Clone`. This PR adds an explicit `impl Clone` for the bounded and unbounded sender types which does not have the `T: Clone` bound. Note that this is _also_ an issue with `#[derive(Debug)]`, but that one is harder to work around as `chan::Tx` _also_ has `#[derive(Debug)]`, as does `chan::Chan`, so we'd have to add explicit impls for all of them to make progress.
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