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* Upgrade futures, async-stream, and futures_codec These were the last three dependencies on futures-preview. `nu` itself is now fully dependent on `futures@0.3`, as opposed to `futures-preview` alpha. Because the update to `futures` from `0.3.0-alpha.19` to `0.3.0` removed the `Stream` implementation of `VecDeque` ([changelog][changelog]), most commands that convert a `VecDeque` to an `OutputStream` broke and had to be fixed. The current solution is to now convert `VecDeque`s to a `Stream` via `futures::stream::iter`. However, it may be useful for `futures` to create an `IntoStream` trait, implemented on the `std::collections` (or really any `IntoIterator`). If something like this happends, it may be worthwhile to update the trait implementations on `OutputStream` and refactor these commands again. While upgrading `futures_codec`, we remove a custom implementation of `LinesCodec`, as one has been added to the library. There's also a small refactor to make the stream output more idiomatic. [changelog]: https://github.com/rust-lang/futures-rs/blob/master/CHANGELOG.md#030---2019-11-5 * Upgrade sys & ps plugin dependencies They were previously dependent on `futures-preview`, and `nu_plugin_ps` was dependent on an old version of `futures-timer`. * Remove dependency on futures-timer from nu * Update Cargo.lock * Fix formatting * Revert fmt regressions CI is still on 1.40.0, but the latest rustfmt v1.41.0 has changes to the `val @ pattern` syntax, causing the linting job to fail. * Fix clippy warnings |
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