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readme: document MSRV policy

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Andrew Gallant 2020-01-11 12:16:57 -05:00
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README.md
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@ -86,18 +86,18 @@ for entry in walker.filter_entry(|e| !is_hidden(e)) {
}
```
### Motivation
### Minimum Rust version policy
`std::fs` has an unstable `walk_dir` implementation that needed some design
work. I started off on that task, but it quickly became apparent that walking
a directory recursively is quite complex and may not be a good fit for `std`
right away.
This crate's minimum supported `rustc` version is `1.23.0`.
This should at least resolve most or all of the issues reported here (and then
some):
The current policy is that the minimum Rust version required to use this crate
can be increased in minor version updates. For example, if `crate 1.0` requires
Rust 1.20.0, then `crate 1.0.z` for all values of `z` will also require Rust
1.20.0 or newer. However, `crate 1.y` for `y > 0` may require a newer minimum
version of Rust.
* https://github.com/rust-lang/rust/issues/27707
* https://github.com/rust-lang/rust/issues/23715
In general, this crate will be conservative with respect to the minimum
supported version of Rust.
### Performance