# arcerror

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Provides thin wrappers around [`Arc<T>`](https://doc.rust-lang.org/stable/alloc/sync/struct.Arc.html) and [`Rc<T>`](https://doc.rust-lang.org/stable/alloc/rc/struct.Rc.html)
where `T`: [`Error`](https://doc.rust-lang.org/stable/core/error/trait.Error.html).  Impls `Error` for both of these types.  No
`unsafe`, no dependencies.

The purpose of this is to impl [`Clone`](https://doc.rust-lang.org/stable/core/clone/macro.Clone.html) for arbitrary `Error` types that
don't already have such an implementation.  The use case that drove it was for an HTTP server
that was making an HTTP request for large files through a third-party wrapper around an API,
and streaming the response to both a File on the local filesystem and to our own HTTP response
concurrently, through a broadcast channel.

A network stream can fail at any time, so every "chunk" is returned in a
[`Result`](https://doc.rust-lang.org/stable/core/result/enum.Result.html); the third-party wrapper crate didn't impl `Clone` on its
error type (and many of the errors it was wrapping also don't impl `Clone`).  This is a solution
to making that `Result` impl `Clone`.

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