fully deprecate the legacy integral modules by cyrgani · Pull Request #146882 · rust-lang/rust

cyrgani · 2025-09-22T11:58:40Z

This PR implements the last step of #68490: marking the std::u8 etc. modules and the constants in std::f32 and std::f64 (but not the undeprecated consts submodule) as fully deprecated.

Revival of #107587 (cc @tgross35).

Closes: #68490

r? libs-api

BurntSushi · 2025-09-22T12:45:34Z

I'm still kind of meh on these deprecations personally, but we should probably finish what was started.

With that said, I'm strongly opposed to applying #[doc(hidden)] to deprecated items. I'm not sure why you're doing that here. It seems like an obviously bad user experience that only serves to gaslight users. Imagine reading old code, wondering what a function does and then going to look it up in the docs only to find that... it isn't there?

Once the #[doc(hidden)] attributes are removed, I'd be happy to kick off an FCP.

cyrgani · 2025-09-22T13:23:56Z

I've removed the #[doc(hidden] attributes.
Regarding why I added them, it is mostly the feeling that having twelve deprecated modules right on the front page of the std documentation is not a good user experience either.
Also, people who would search the docs for core::u8::MAX would still get u8::MAX as their first search result to find out what the constant means.

BurntSushi · 2025-09-22T13:26:53Z

Regarding why I added them, it is mostly the feeling that having twelve deprecated modules right on the front page of the std documentation is not a good user experience either.

Perhaps! But the solution is definitely not to completely hide them.

Also, people who would search the docs for core::u8::MAX would still get u8::MAX as their first search result to find out what the constant means.

Sure, same thing applies here. I don't know anything about how rustdoc's search result ranking works, but it seems reasonable that it could take deprecation status into account.

BurntSushi · 2025-09-22T13:27:51Z

@rfcbot merge

rust-rfcbot · 2025-09-22T13:27:53Z

Team member @BurntSushi has proposed to merge this. The next step is review by the rest of the tagged team members:

No concerns currently listed.

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

Needed for rust-lang/rust#146882.

…mdev give a better example why `std` modules named like primitives are needed A small update to the `std` `lib.rs` introduction to replace mentions of `std::i32` (never needed) with `std::char` (sometimes needed). Related to rust-lang#146882.

Rollup merge of #147373 - cyrgani:cyrgani-patch-1, r=ibraheemdev give a better example why `std` modules named like primitives are needed A small update to the `std` `lib.rs` introduction to replace mentions of `std::i32` (never needed) with `std::char` (sometimes needed). Related to #146882.

…mdev give a better example why `std` modules named like primitives are needed A small update to the `std` `lib.rs` introduction to replace mentions of `std::i32` (never needed) with `std::char` (sometimes needed). Related to rust-lang#146882.

give a better example why `std` modules named like primitives are needed A small update to the `std` `lib.rs` introduction to replace mentions of `std::i32` (never needed) with `std::char` (sometimes needed). Related to rust-lang/rust#146882.

rust-rfcbot · 2025-10-15T15:28:40Z

🔔 This is now entering its final comment period, as per the review above. 🔔

RalfJung · 2025-10-23T08:08:27Z

marking the std::u8 etc. modules as fully deprecated and as #[doc(hidden)].

It seems the doc(hidden) part got removed; please also update the PR description since it will permanently become part pf the git history.

rustbot · 2025-12-25T14:02:41Z

The Miri subtree was changed

cc @rust-lang/miri

rustbot · 2025-12-25T14:44:26Z

Some changes occurred in src/tools/rustfmt

cc @rust-lang/rustfmt

rustbot · 2025-12-25T18:38:47Z

stdarch is developed in its own repository. If possible, consider making this change to rust-lang/stdarch instead.

cc @Amanieu, @folkertdev, @sayantn

rustbot · 2025-12-25T22:08:50Z

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

RalfJung · 2025-12-26T17:41:50Z

src/tools/miri/tests/pass/float.rs

    macro_rules! fixed_atan2_cases{
        ($float_type:ident) => {{
            use std::$float_type::consts::{PI, FRAC_PI_2, FRAC_PI_4};
-            use $float_type::{INFINITY, NEG_INFINITY};


Does useing these no longer work? I'd prefer not to make the tests below more verbose with all these long paths.

Unfortunately, there is no good way for this. I added two constants instead for now, but I'm not happy with that solution either.

Needed for rust-lang/rust#146882.

rustbot · 2026-02-14T13:28:07Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

rustbot assigned BurntSushi Sep 22, 2025

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cyrgani changed the title ~~fully deprecate and hide the legacy integral modules~~ fully deprecate the legacy integral modules Sep 22, 2025

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Remove usage of the to-be-deprecated core::f32, core::f64 items rust-lang/compiler-builtins#1022

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Remove usage of the to-be-deprecated core::f32, core::f64 items

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Needed for rust-lang/rust#146882.

cyrgani mentioned this pull request Oct 5, 2025

give a better example why std modules named like primitives are needed #147373

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Remove usage of the to-be-deprecated core::f32, core::f64 items

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fully deprecate the legacy integral modules

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rust-cloud-vms bot force-pushed the deprecate-legacy-int-mods branch from 1767156 to 35e1fab Compare February 14, 2026 13:28

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