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Streamline find_lang_feature_issue.

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It currently processes `ACTIVE_FEATURES` separately from
`ACCEPTED_FEATURES`, `REMOVED_FEATURES`, and `STABLE_REMOVED_FEATURES`,
for no good reason. This commit treats them uniformly.
This commit is contained in:
Nicholas Nethercote 2023-10-04 14:54:12 +11:00
parent 3c1b60c1b4
commit 1ddb2872dd
1 changed files with 14 additions and 15 deletions
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15
compiler/rustc_feature/src/lib.rs
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@ -79,8 +79,8 @@ pub enum UnstableFeatures {
impl UnstableFeatures {
/// This takes into account `RUSTC_BOOTSTRAP`.
///
/// If `krate` is [`Some`], then setting `RUSTC_BOOTSTRAP=krate` will enable the nightly features.
/// Otherwise, only `RUSTC_BOOTSTRAP=1` will work.
/// If `krate` is [`Some`], then setting `RUSTC_BOOTSTRAP=krate` will enable the nightly
/// features. Otherwise, only `RUSTC_BOOTSTRAP=1` will work.
pub fn from_environment(krate: Option<&str>) -> Self {
// `true` if this is a feature-staged build, i.e., on the beta or stable channel.
let disable_unstable_features =
@ -107,21 +107,20 @@ impl UnstableFeatures {
}
fn find_lang_feature_issue(feature: Symbol) -> Option<NonZeroU32> {
if let Some(info) = ACTIVE_FEATURES.iter().find(|t| t.name == feature) {
info.issue
} else {
// search in Accepted, Removed, or Stable Removed features
let found = ACCEPTED_FEATURES
// Search in all the feature lists.
let found = []
.iter()
.chain(ACTIVE_FEATURES)
.chain(ACCEPTED_FEATURES)
.chain(REMOVED_FEATURES)
.chain(STABLE_REMOVED_FEATURES)
.find(|t| t.name == feature);
match found {
Some(found) => found.issue,
None => panic!("feature `{feature}` is not declared anywhere"),
}
}
}
const fn to_nonzero(n: Option<u32>) -> Option<NonZeroU32> {
// Can be replaced with `n.and_then(NonZeroU32::new)` if that is ever usable