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Document new behavior on non-nightly toolchains

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David Tolnay 2018-05-15 09:42:05 -07:00
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@ -22,9 +22,11 @@ This command optionally uses [`Pygments`](http://pygments.org/) to colorize the
expanded output. If `Pygments` is not available, the expanded code is not expanded output. If `Pygments` is not available, the expanded code is not
colorized. Install with `pip install Pygments`. colorized. Install with `pip install Pygments`.
Cargo expand requires a nightly toolchain because it relies on unstable compiler Cargo expand relies on unstable compiler flags so it requires a nightly
flags. If nightly is not your default toolchain, the `cargo expand` commands toolchain to be installed, though does not require nightly to be the default
shown below will need to be run as `cargo +nightly expand`. toolchain or the one with which cargo expand itself is executed. If the default
toolchain is one other than nightly, running `cargo expand` will find and use
nightly anyway.
## Example ## Example