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Merge pull request #2249 from CAD97/patch-3

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unstable_features without CFG_RELEASE_CHANNEL
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Nick Cameron 2017-12-11 08:45:02 +13:00 committed by GitHub
commit db5d6dd702
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1 changed files with 11 additions and 1 deletions
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12
src/config.rs
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@ -21,11 +21,21 @@ use file_lines::FileLines;
use lists::{ListTactic, SeparatorPlace, SeparatorTactic};
use Summary;
/// Check if we're in a nightly build.
///
/// The environment variable `CFG_RELEASE_CHANNEL` is set during the rustc bootstrap
/// to "stable", "beta", or "nightly" depending on what toolchain is being built.
/// If we are being built as part of the stable or beta toolchains, we want
/// to disable unstable configuration options.
///
/// If we're being built by cargo (e.g. `cargo +nightly install rustfmt-nightly`),
/// `CFG_RELEASE_CHANNEL` is not set. As we only support being built against the
/// nightly compiler when installed from crates.io, default to nightly mode.
macro_rules! is_nightly_channel {
() => {
option_env!("CFG_RELEASE_CHANNEL")
.map(|c| c == "nightly")
.unwrap_or(false)
.unwrap_or(true)
}
}