Stabilize `ptr::{from_ref, from_mut}`
I propose to stabilize the following APIs:
```rust
// mod core::ptr
pub const fn from_ref<T: ?Sized>(r: &T) -> *const T;
pub const fn from_mut<T: ?Sized>(r: &mut T) -> *mut T;
```
Tracking issue: https://github.com/rust-lang/rust/issues/106116
---
``@RalfJung`` what do you think we should do with `from_mut`? Stabilize it as const, given that you can't call it anyway (no way to get `&mut` in `const fn`)? Defer stabilizing it as const leaving the same issue/feature? Change issue/feature? Change issue/feature to the "`&mut` in const fn" one?
codegen_llvm: set `DW_AT_accessibility`
Fixes#9228.
Based on #74778.
Sets the accessibility of types and fields in DWARF using `DW_AT_accessibility` attribute.
`DW_AT_accessibility` (public/protected/private) isn't exactly right for Rust, but neither is `DW_AT_visibility` (local/exported/qualified), and there's no way to set `DW_AT_visbility` in LLVM's API. Debuggers will special-case the handling of these per-language anyway.
r? `@wesleywiser` (visited in wg-debugging triage)
Annotate some bugs
Gives a semi-helpful message to some `bug!()`/`unreachable!()`/`panic!()`. This also works around some other bugs/panics/etc that weren't needed, and also makes some of them into `span_bug!`s so they also have a useful span.
Note to reviewer: best to disable whitespace when comparing for some cases where indentation changed.
cc #118955
Sets the accessibility of types and fields in DWARF using
`DW_AT_accessibility` attribute.
`DW_AT_accessibility` (public/protected/private) isn't exactly right for
Rust, but neither is `DW_AT_visibility` (local/exported/qualified), and
there's no way to set `DW_AT_visbility` in LLVM's API.
Signed-off-by: David Wood <david@davidtw.co>
Some cleanup and improvement for invalid ref casting impl
This PR makes some cleanups and improvements to the `invalid_reference_casting` implementation in preparation for linting on new patterns, while reusing most of the logic.
r? `@est31` (feel free to re-assign)
rustc_mir_build: Enforce `rustc::potential_query_instability` lint
Stop allowing `rustc::potential_query_instability` on all of `rustc_mir_build` and instead allow it on a case-by-case basis if it is safe to do so. In this crate there was only one instance of the lint, and it was safe to allow.
Part of https://github.com/rust-lang/rust/issues/84447 which is E-help-wanted.
rustdoc: allow resizing the sidebar / hiding the top bar
Fixes#97306
Preview: http://notriddle.com/rustdoc-html-demo-4/sidebar-resize/std/index.html
## Summary
This feature adds:
1. A checkbox to the Settings popover to hide the persistent navigation bar (the sidebar on large viewports and the top bar on small ones).
2. On large viewports, it adds a resize handle to the persistent sidebar. Resizing it into nothing is equivalent to turning off the persistent navigation bar checkbox in Settings.
3. If the navigation bar is hidden, a toolbar button to the left of the search appears. Clicking it brings the navigation bar back.
## Motivation
While "mobile mode" is definitely a good default, it's not the only reason people have wanted to hide the sidebar:
* Some people use tiling window managers, and don't like rustdoc's current breakpoints. Changing the breakpoints might help with that, but there's no perfect solution, because there's a gap between "huge screen" and "smartphone" where reasonable people can disagree about whether it makes sense for the sidebar to be on-screen. https://github.com/rust-lang/rust/issues/97306
* Some people ask for ways to reduce on-screen clutter because it makes it easier to focus. There's not a media query for that (and if there was, privacy-conscious users would turn it off). https://github.com/rust-lang/rust/issues/59829
This feature is designed to avoid these problems. Resizing the sidebar especially helps, because it provides a way to hide the sidebar without adding a new top-level button (which would add clutter), and it provides a way to make rustdoc play nicer in complex, custom screen layouts.
## Guide and Reference-level explanation
On a desktop or laptop with a mouse, resize the sidebar by dragging its right edge.
On any browser, including mobile phones, the sticky top bar or side bar can be hidden from the Settings area (the button with the cog wheel, next to the search bar). When it's hidden, a convenient button will appear on the search bar's left.
## Drawbacks
This adds more JavaScript code to the render blocking area.
## Rationale and alternatives
The most obvious way to allow people to hide the sidebar would have been to let them "manually enter mobile mode." The upside is that it's a feature we already have. The downside is that it's actually really hard to come up with a terse description. Is it:
* A Setting that forces desktop viewers to always have the mobile-style top bar? If so, how do we label it? Should it be visible on mobile, and, if so, does it just not do anything?
* A persistent hide/show sidebar button, present on desktop, just like on mobile? That's clutter that I'd like to avoid.
## Prior art
* The new file browser in GitHub uses a similar divider with a mouse-over indicator
* mdBook and macOS Finder both allow you to resize the sidebar to nothing as a gesture to hide it
* https://www.nngroup.com/articles/drag-drop/
## Future possibilities
https://rust-lang.zulipchat.com/#narrow/stream/266220-rustdoc/topic/Table.20of.20contents proposes a new, second sidebar (a table of contents). How should it fit in with this feature? Should it be resizeable? Hideable? Can it be accessed on mobile?
Don't merge cfg and doc(cfg) attributes for re-exports
Fixes#112881.
## Explanations
When re-exporting things with different `cfg`s there are two things that can happen:
* The re-export uses a subset of `cfg`s, this subset is sufficient so that the item will appear exactly with the subset
* The re-export uses a non-subset of `cfg`s (e.g. like the example I posted just above where the re-export is ungated), if the non-subset `cfg`s are active (e.g. compiling that example on windows) then this will be a compile error as the item doesn't exist to re-export, if the subset `cfg`s are active it behaves like 1.
### Glob re-exports?
**This only applies to non-glob inlined re-exports.** For glob re-exports the item may or may not exist to be re-exported (potentially the `cfg`s on the path up until the glob can be removed, and only `cfg`s on the globbed item itself matter), for non-inlined re-exports see https://github.com/rust-lang/rust/issues/85043.
cc `@Nemo157`
r? `@notriddle`
Rollup of 2 pull requests
Successful merges:
- #118927 (Erase late bound regions from `Instance::fn_sig()` and add a few more details to StableMIR APIs)
- #118964 (Opportunistically resolve region var in canonicalizer (instead of resolving root var))
r? `@ghost`
`@rustbot` modify labels: rollup
Opportunistically resolve region var in canonicalizer (instead of resolving root var)
See comment in `compiler/rustc_type_ir/src/infcx.rs`.
The **root** infer region for a given region vid may not actually be nameable from the universe of the original vid. That means that the assertion in the canonicalizer was too strict, since the `EagerResolver` that we use before canonicalizing is doing only as much resolving as it can.
This replaces `resolve_lt_var` and `probe_lt_var` in the `rustc_type_ir` API with `opportunistic_resolve_lt_var`, which acts as you expect it should. I left a FIXME that complains about the inconsistency.
This test is really gnarly, but I have no idea how to minimize it, since it seems to kind of just be coincidental that it triggered this issue. I hope the underlying root cause is easy enough to understand, though.
r? `@lcnr` or `@aliemjay`
Fixes#118950
Erase late bound regions from `Instance::fn_sig()` and add a few more details to StableMIR APIs
The Instance `fn_sig()` still included a late bound regions which needed a new compiler function in order to be erased. I've also bundled the following small fixes in this PR, let me know if you want me to isolate any of them.
- Add missing `CoroutineKind::AsyncGen`.
- Add optional spread argument to function body which is needed to properly analyze compiler shims.
- Add a utility method to iterate over all locals together with their declaration.
- Add a method to get the description of `AssertMessage`*.
* For the last one, we could consider eventually calling the internal `AssertKind::description()` to avoid code duplication. However, we still don't have ways to convert `AssertMessage`, `Operand`, `Place` and others, in order to use that. The other downside of using the internal method is that it will panic for some of the variants.
r ? `@ouz-a`
Rollup of 3 pull requests
Successful merges:
- #116888 (Add discussion that concurrent access to the environment is unsafe)
- #118888 (Uplift `TypeAndMut` and `ClosureKind` to `rustc_type_ir`)
- #118929 (coverage: Tidy up early parts of the instrumentor pass)
r? `@ghost`
`@rustbot` modify labels: rollup
Uplift `TypeAndMut` and `ClosureKind` to `rustc_type_ir`
Uplifts `TypeAndMut` and `ClosureKind`
I know I said I was just going to get rid of `TypeAndMut` (https://github.com/rust-lang/types-team/issues/124) but I think this is much simpler, lol
r? `@jackh726` or `@lcnr`
coverage: Tidy up early parts of the instrumentor pass
This is extracted from #118237, which needed to be manually rebased anyway.
Unlike that PR, this one only affects the coverage instrumentor, and doesn't attempt to move any code into the MIR builder. That can be left to a future version of #118305, which can still benefit from these improvements.
So this is now mostly a refactoring of some internal parts of the instrumentor.
Uplift `TypeAndMut` and `ClosureKind` to `rustc_type_ir`
Uplifts `TypeAndMut` and `ClosureKind`
I know I said I was just going to get rid of `TypeAndMut` (https://github.com/rust-lang/types-team/issues/124) but I think this is much simpler, lol
r? `@jackh726` or `@lcnr`
Add discussion that concurrent access to the environment is unsafe
The bug report #27970 has existed for 8 years, the actual bug dates back to Rust pre-1.0. I documented it since it's in the interest of the user to be aware of it. The note can be removed once #27970 is fixed.
