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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
colorized. Install with `pip install Pygments`.
Cargo expand requires a nightly toolchain because it relies on unstable compiler
flags. If nightly is not your default toolchain, the `cargo expand` commands
shown below will need to be run as `cargo +nightly expand`.
Cargo expand relies on unstable compiler flags so it requires a nightly
toolchain to be installed, though does not require nightly to be the default
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