Tracking the old name of renamed unstable library features #142158

xizheyin · 2025-06-07T11:04:05Z

This PR resolves the first problem of #141617 : tracking renamed unstable features. The first commit is to add a ui test, and the second one tracks the changes. I will comment on the code for clarification.

r? @jdonszelmann
There have been a lot of PR's reviewed by you lately, thanks for your time!

cc @jyn514

Signed-off-by: xizheyin <[email protected]>

rustbot · 2025-06-07T11:04:10Z

jdonszelmann is currently at their maximum review capacity.
They may take a while to respond.

rustbot · 2025-06-07T11:04:13Z

Changes to the size of AST and/or HIR nodes.

cc @nnethercote

Some changes occurred in compiler/rustc_attr_data_structures

cc @jdonszelmann

Some changes occurred in compiler/rustc_attr_parsing

cc @jdonszelmann

xizheyin · 2025-06-07T11:10:27Z

compiler/rustc_passes/src/stability.rs

-        for (feature, since) in defined_features.to_sorted_vec() {
-            if let FeatureStability::AcceptedSince(since) = since
+        for (feature, stability) in defined_features.to_sorted_vec() {
+            if let FeatureStability::AcceptedSince(since) = stability


Naming it since is not accurate here, the attribute here may be unstable. So I renamed it to stability.

xizheyin · 2025-06-07T11:16:03Z

compiler/rustc_passes/src/stability.rs

+            if let FeatureStability::Unstable(Some(alias)) = stability {
+                if let Some(span) = remaining_lib_features.swap_remove(&alias) {
+                    tcx.dcx().emit_err(errors::RenamedFeature { span, feature, alias });
+                }
+            }
+


In check_features, check if any of the defined features have alias the same as the #![feature(...)]-declared feature, and if they do, remove them and issue an error. This way, it won't issue the unknown features error later.

xizheyin · 2025-06-07T11:18:49Z

library/core/src/ops/control_flow.rs

@@ -98,7 +98,7 @@ pub enum ControlFlow<B, C = ()> {
    // is a no-op conversion in the `Try` implementation.
 }

-#[unstable(feature = "try_trait_v2", issue = "84277")]
+#[unstable(feature = "try_trait_v2", issue = "84277", alias = "try_trait")]


I'm currently using try_trait as an example, I'm trying to find out what other features have been renamed in the standard library, I also found slice_internals_v2, but that may not be enough.

alias has been replaced with old_name.

Noratrieb · 2025-06-07T12:21:26Z

library/core/src/ops/try_trait.rs

@@ -112,7 +112,7 @@ use crate::ops::ControlFlow;
 ///     R::from_output(accum)
 /// }
 /// ```
-#[unstable(feature = "try_trait_v2", issue = "84277")]
+#[unstable(feature = "try_trait_v2", issue = "84277", alias = "try_trait")]


I think "alias" is a bit misleading. It's not an alias that can be used, it's the previous name that can no longer be used. I'd call it previous_name or something like that to make it clear what it is.

Thanks for advice, I change it to old_name, which would be shorter than previous_name and presents the same meaning.

jdonszelmann · 2025-06-12T10:39:19Z

compiler/rustc_middle/src/middle/mod.rs

@@ -12,7 +12,7 @@ pub mod lib_features {
    #[derive(HashStable, TyEncodable, TyDecodable)]
    pub enum FeatureStability {
        AcceptedSince(Symbol),
-        Unstable,
+        Unstable(Option<Symbol>),


it's nicer I think if this is a named variant with old_name in it. I wouldn't know what this meant otherwise. AcceptedSince is clearer in that regard so is fine staying the way it is. Ping me after that and I'll r+ @rusbot author

jdonszelmann · 2025-06-12T10:53:03Z

@rustbot author

rustbot · 2025-06-12T10:53:06Z

Reminder, once the PR becomes ready for a review, use @rustbot ready.

Signed-off-by: xizheyin <[email protected]>

xizheyin · 2025-06-12T11:25:46Z

I revised it. 😊 @jdonszelmann
@rustbot ready

jdonszelmann · 2025-06-12T12:39:37Z

@bors r+ rollup

bors · 2025-06-12T12:39:40Z

📌 Commit b8066f9 has been approved by jdonszelmann

It is now in the queue for this repository.

Rollup of 10 pull requests Successful merges: - #134847 (Implement asymmetrical precedence for closures and jumps) - #141491 (Delegate `<CStr as Debug>` to `ByteStr`) - #141770 (Merge `Cfg::render_long_html` and `Cfg::render_long_plain` methods common code) - #142069 (Introduce `-Zmacro-stats`) - #142158 (Tracking the old name of renamed unstable library features) - #142221 ([AIX] strip underlying xcoff object) - #142340 (miri: we can use apfloat's mul_add now) - #142379 (Add bootstrap option to compile a tool with features) - #142410 (intrinsics: rename min_align_of to align_of) - #142413 (rustc-dev-guide subtree update) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of #142158 - xizheyin:141617, r=jdonszelmann Tracking the old name of renamed unstable library features This PR resolves the first problem of #141617 : tracking renamed unstable features. The first commit is to add a ui test, and the second one tracks the changes. I will comment on the code for clarification. r? `@jdonszelmann` There have been a lot of PR's reviewed by you lately, thanks for your time! cc `@jyn514`

Rollup of 10 pull requests Successful merges: - rust-lang/rust#134847 (Implement asymmetrical precedence for closures and jumps) - rust-lang/rust#141491 (Delegate `<CStr as Debug>` to `ByteStr`) - rust-lang/rust#141770 (Merge `Cfg::render_long_html` and `Cfg::render_long_plain` methods common code) - rust-lang/rust#142069 (Introduce `-Zmacro-stats`) - rust-lang/rust#142158 (Tracking the old name of renamed unstable library features) - rust-lang/rust#142221 ([AIX] strip underlying xcoff object) - rust-lang/rust#142340 (miri: we can use apfloat's mul_add now) - rust-lang/rust#142379 (Add bootstrap option to compile a tool with features) - rust-lang/rust#142410 (intrinsics: rename min_align_of to align_of) - rust-lang/rust#142413 (rustc-dev-guide subtree update) r? `@ghost` `@rustbot` modify labels: rollup

Add test renamed_feature.rs

8eeaed0

Signed-off-by: xizheyin <[email protected]>

rustbot assigned jdonszelmann Jun 7, 2025

xizheyin changed the title ~~141617~~ Tracking the old name of renamed unstable library attribute Jun 7, 2025

xizheyin changed the title ~~Tracking the old name of renamed unstable library attribute~~ Tracking the old name of renamed unstable library features Jun 7, 2025

xizheyin commented Jun 7, 2025

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Noratrieb reviewed Jun 7, 2025

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xizheyin force-pushed the 141617 branch from 6c9a2e2 to 881fafc Compare June 7, 2025 14:25

jdonszelmann reviewed Jun 12, 2025

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rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 12, 2025

Tracking the old name of renamed unstable library attribute

b8066f9

Signed-off-by: xizheyin <[email protected]>

xizheyin force-pushed the 141617 branch from 881fafc to b8066f9 Compare June 12, 2025 11:24

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jun 12, 2025

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 12, 2025

matthiaskrgr mentioned this pull request Jun 13, 2025

Rollup of 10 pull requests #142442

Merged

bors merged commit fac011e into rust-lang:master Jun 13, 2025
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rustbot added this to the 1.89.0 milestone Jun 13, 2025

xizheyin deleted the 141617 branch June 13, 2025 14:51

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