Tracking the old name of renamed unstable library features #142158
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Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
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rustbot
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Changes to the size of AST and/or HIR nodes. cc @nnethercote Some changes occurred in compiler/rustc_attr_data_structures Some changes occurred in compiler/rustc_attr_parsing |
xizheyin
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xizheyin
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| 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 |
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Naming it since is not accurate here, the attribute here may be unstable. So I renamed it to stability.
| 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 }); | ||
| } | ||
| } | ||
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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.
library/core/src/ops/control_flow.rs
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| @@ -98,7 +98,7 @@ pub enum ControlFlow<B, C = ()> { | |||
| // is a no-op conversion in the `Try` implementation. | |||
| } | |||
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| #[unstable(feature = "try_trait_v2", issue = "84277")] | |||
| #[unstable(feature = "try_trait_v2", issue = "84277", alias = "try_trait")] | |||
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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.
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alias has been replaced with old_name.
library/core/src/ops/try_trait.rs
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| @@ -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")] | |||
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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.
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Thanks for advice, I change it to old_name, which would be shorter than previous_name and presents the same meaning.
Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
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