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std futures note #16

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std futures note #16

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11 changes: 11 additions & 0 deletions README.md
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Expand Up @@ -159,6 +159,17 @@ With [cargo-edit](https://crates.io/crates/cargo-edit) do:
$ cargo add runtime --allow-prerelease
```

To use Futures in the same project, make sure to install
[futures-preview](https://docs.rs/futures-preview/) for std futures.
```sh
$ cargo add futures-preview --allow-prerelease
```

`futures-preview` provides support for std futures/futures 0.3, while `futures` provides support for
the no longer developed futures 0.1. Once futures land in stdlib, it's expected that the two crates
will merge back into `futures`. With the hopes that eventually most of `futures` will be part of
stdlib.

## FAQ
### When is it useful to switch Runtimes?
What might be the best solution now, might not stay the best in the future. As Rust grows, so will
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