Don't allow flattened format_args in const. #139624
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Don't allow flattened format_args in const. Fixes rust-lang#139136 and rust-lang#139621 by breaking the 'flattened format_args' cases. This is a breaking change. Let's try a crater run.
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These all seem spurious. Landing this requires FCP, but I'm not sure which team -- lang and/or libs-api? |
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Team member @m-ou-se 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! cc @rust-lang/lang-advisors: FCP proposed for lang, please feel free to register concerns. |
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The final comment period, with a disposition to merge, as per the review above, is now complete. As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed. This will be merged soon. |
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…iaskrgr Rollup of 9 pull requests Successful merges: - rust-lang#134232 (Share the naked asm impl between cg_ssa and cg_clif) - rust-lang#139624 (Don't allow flattened format_args in const.) - rust-lang#140090 (Check bare function idents for non snake-case name) - rust-lang#140203 (Issue an error when using `no_mangle` on language items) - rust-lang#140450 (ast: Remove token visiting from AST visitor) - rust-lang#140498 (Misc tweaks to HIR typeck (mostly w.r.t. checking calls)) - rust-lang#140504 (transmutability: ensure_sufficient_stack when answering query) - rust-lang#140506 (unstable-book: fix capitalization) - rust-lang#140516 (Replace use of rustc_type_ir by rustc_middle) Failed merges: - rust-lang#140374 (Resolve instance for SymFn in global/naked asm) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#139624 - m-ou-se:unconst-format-args, r=jhpratt Don't allow flattened format_args in const. Fixes rust-lang#139136 Fixes rust-lang#139621 We allow `format_args!("a")` in const, but don't allow any format_args with arguments in const, such as `format_args!("{}", arg)`. However, we accidentally allow `format_args!("hello {}", "world")` in const, as it gets flattened to `format_args!("hello world")`. This also applies to panic in const. This wasn't supposed to happen. I added protection against this in the format args flattening code, ~~but I accidentally marked a function as const that shouldn't have been const~~ but this was removed in rust-lang#135139. This is a breaking change. The crater found no breakage, however. This breaks things like: ```rust const _: () = if false { panic!("a {}", "a") }; ``` and ```rust const F: std::fmt::Arguments<'static> = format_args!("a {}", "a"); ```
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[beta] backports - Don't allow flattened format_args in const. rust-lang#139624 - set subsections_via_symbols for ld64 helper sections rust-lang#139752 - Fix detection of `main` function if there are expressions around it rust-lang#140220 - rustdoc: Fix doctest heuristic for main fn wrapping rust-lang#140420 - extend the list of registered dylibs on `test::prepare_cargo_test` rust-lang#140563 r? cuviper
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…ratt Don't allow flattened format_args in const. Fixes rust-lang#139136 Fixes rust-lang#139621 We allow `format_args!("a")` in const, but don't allow any format_args with arguments in const, such as `format_args!("{}", arg)`. However, we accidentally allow `format_args!("hello {}", "world")` in const, as it gets flattened to `format_args!("hello world")`. This also applies to panic in const. This wasn't supposed to happen. I added protection against this in the format args flattening code, ~~but I accidentally marked a function as const that shouldn't have been const~~ but this was removed in rust-lang#135139. This is a breaking change. The crater found no breakage, however. This breaks things like: ```rust const _: () = if false { panic!("a {}", "a") }; ``` and ```rust const F: std::fmt::Arguments<'static> = format_args!("a {}", "a"); ```
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This MR contains the following updates: | Package | Update | Change | |---|---|---| | [rust](https://github.com/rust-lang/rust) | minor | `1.86.0` -> `1.87.0` | MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot). **Proposed changes to behavior should be submitted there as MRs.** --- ### Release Notes <details> <summary>rust-lang/rust (rust)</summary> ### [`v1.87.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1870-2025-05-15) [Compare Source](rust-lang/rust@1.86.0...1.87.0) \========================== <a id="1.87.0-Language"></a> ## Language - [Stabilize `asm_goto` feature](rust-lang/rust#133870) - [Allow parsing open beginning ranges (`..EXPR`) after unary operators `!`, `-`, and `*`](rust-lang/rust#134900). - [Don't require method impls for methods with `Self: Sized` bounds in `impl`s for unsized types](rust-lang/rust#135480) - [Stabilize `feature(precise_capturing_in_traits)` allowing `use<...>` bounds on return position `impl Trait` in `trait`s](rust-lang/rust#138128) <a id="1.87.0-Compiler"></a> ## Compiler - [x86: make SSE2 required for i686 targets and use it to pass SIMD types](rust-lang/rust#135408) <a id="1.87.0-Platform-Support"></a> ## Platform Support - [Remove `i586-pc-windows-msvc` target](rust-lang/rust#137957) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. [platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html <a id="1.87.0-Libraries"></a> ## Libraries - [Stabilize the anonymous pipe API](rust-lang/rust#127154) - [Add support for unbounded left/right shift operations](rust-lang/rust#129375) - [Print pointer metadata in `Debug` impl of raw pointers](rust-lang/rust#135080) - [`Vec::with_capacity` guarantees it allocates with the amount requested, even if `Vec::capacity` returns a different number.](rust-lang/rust#135933) - Most `std::arch` intrinsics which don't take pointer arguments can now be called from safe code if the caller has the appropriate target features already enabled (rust-lang/stdarch#1714, rust-lang/stdarch#1716, rust-lang/stdarch#1717) - [Undeprecate `env::home_dir`](rust-lang/rust#137327) - [Denote `ControlFlow` as `#[must_use]`](rust-lang/rust#137449) - [Macros such as `assert_eq!` and `vec!` now support `const {...}` expressions](rust-lang/rust#138162) <a id="1.87.0-Stabilized-APIs"></a> ## Stabilized APIs - [`Vec::extract_if`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.extract_if) - [`vec::ExtractIf`](https://doc.rust-lang.org/stable/std/vec/struct.ExtractIf.html) - [`LinkedList::extract_if`](https://doc.rust-lang.org/stable/std/collections/struct.LinkedList.html#method.extract_if) - [`linked_list::ExtractIf`](https://doc.rust-lang.org/stable/std/collections/linked_list/struct.ExtractIf.html) - [`<[T]>::split_off`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off) - [`<[T]>::split_off_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_mut) - [`<[T]>::split_off_first`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_first) - [`<[T]>::split_off_first_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_first_mut) - [`<[T]>::split_off_last`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_last) - [`<[T]>::split_off_last_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_last_mut) - [`String::extend_from_within`](https://doc.rust-lang.org/stable/alloc/string/struct.String.html#method.extend_from_within) - [`os_str::Display`](https://doc.rust-lang.org/stable/std/ffi/os_str/struct.Display.html) - [`OsString::display`](https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.display) - [`OsStr::display`](https://doc.rust-lang.org/stable/std/ffi/struct.OsStr.html#method.display) - [`io::pipe`](https://doc.rust-lang.org/stable/std/io/fn.pipe.html) - [`io::PipeReader`](https://doc.rust-lang.org/stable/std/io/struct.PipeReader.html) - [`io::PipeWriter`](https://doc.rust-lang.org/stable/std/io/struct.PipeWriter.html) - [`impl From<PipeReader> for OwnedHandle`](https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html#impl-From%3CPipeReader%3E-for-OwnedHandle) - [`impl From<PipeWriter> for OwnedHandle`](https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html#impl-From%3CPipeWriter%3E-for-OwnedHandle) - [`impl From<PipeReader> for Stdio`](https://doc.rust-lang.org/stable/std/process/struct.Stdio.html) - [`impl From<PipeWriter> for Stdio`](https://doc.rust-lang.org/stable/std/process/struct.Stdio.html#impl-From%3CPipeWriter%3E-for-Stdio) - [`impl From<PipeReader> for OwnedFd`](https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html#impl-From%3CPipeReader%3E-for-OwnedFd) - [`impl From<PipeWriter> for OwnedFd`](https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html#impl-From%3CPipeWriter%3E-for-OwnedFd) - [`Box<MaybeUninit<T>>::write`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.write) - [`impl TryFrom<Vec<u8>> for String`](https://doc.rust-lang.org/stable/std/string/struct.String.html#impl-TryFrom%3CVec%3Cu8%3E%3E-for-String) - [`<*const T>::offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from_unsigned) - [`<*const T>::byte_offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.byte_offset_from_unsigned) - [`<*mut T>::offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from_unsigned-1) - [`<*mut T>::byte_offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.byte_offset_from_unsigned-1) - [`NonNull::offset_from_unsigned`](https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.offset_from_unsigned) - [`NonNull::byte_offset_from_unsigned`](https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.byte_offset_from_unsigned) - [`<uN>::cast_signed`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.cast_signed) - [`NonZero::<uN>::cast_signed`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.cast_signed-5). - [`<iN>::cast_unsigned`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.cast_unsigned). - [`NonZero::<iN>::cast_unsigned`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.cast_unsigned-5). - [`<uN>::is_multiple_of`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.is_multiple_of) - [`<uN>::unbounded_shl`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unbounded_shl) - [`<uN>::unbounded_shr`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unbounded_shr) - [`<iN>::unbounded_shl`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unbounded_shl) - [`<iN>::unbounded_shr`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unbounded_shr) - [`<iN>::midpoint`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.midpoint) - [`<str>::from_utf8`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8) - [`<str>::from_utf8_mut`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8\_mut) - [`<str>::from_utf8_unchecked`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8\_unchecked) - [`<str>::from_utf8_unchecked_mut`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8\_unchecked_mut) These previously stable APIs are now stable in const contexts: - [`core::str::from_utf8_mut`](https://doc.rust-lang.org/stable/std/str/fn.from_utf8\_mut.html) - [`<[T]>::copy_from_slice`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.copy_from_slice) - [`SocketAddr::set_ip`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.set_ip) - [`SocketAddr::set_port`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.set_port), - [`SocketAddrV4::set_ip`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.set_ip) - [`SocketAddrV4::set_port`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.set_port), - [`SocketAddrV6::set_ip`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_ip) - [`SocketAddrV6::set_port`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_port) - [`SocketAddrV6::set_flowinfo`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_flowinfo) - [`SocketAddrV6::set_scope_id`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_scope_id) - [`char::is_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_digit) - [`char::is_whitespace`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_whitespace) - [`<[[T; N]]>::as_flattened`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_flattened) - [`<[[T; N]]>::as_flattened_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_flattened_mut) - [`String::into_bytes`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.into_bytes) - [`String::as_str`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_str) - [`String::capacity`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.capacity) - [`String::as_bytes`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_bytes) - [`String::len`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.len) - [`String::is_empty`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.is_empty) - [`String::as_mut_str`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_mut_str) - [`String::as_mut_vec`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_mut_vec) - [`Vec::as_ptr`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_ptr) - [`Vec::as_slice`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_slice) - [`Vec::capacity`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.capacity) - [`Vec::len`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.len) - [`Vec::is_empty`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.is_empty) - [`Vec::as_mut_slice`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_mut_slice) - [`Vec::as_mut_ptr`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_mut_ptr) <a id="1.87.0-Cargo"></a> ## Cargo - [Add terminal integration via ANSI OSC 9;4 sequences](rust-lang/cargo#14615) - [chore: bump openssl to v3](rust-lang/cargo#15232) - [feat(package): add --exclude-lockfile flag](rust-lang/cargo#15234) <a id="1.87.0-Compatibility-Notes"></a> ## Compatibility Notes - [Rust now raises an error for macro invocations inside the `#![crate_name]` attribute](rust-lang/rust#127581) - [Unstable fields are now always considered to be inhabited](rust-lang/rust#133889) - [Macro arguments of unary operators followed by open beginning ranges may now be matched differently](rust-lang/rust#134900) - [Make `Debug` impl of raw pointers print metadata if present](rust-lang/rust#135080) - [Warn against function pointers using unsupported ABI strings in dependencies](rust-lang/rust#135767) - [Associated types on `dyn` types are no longer deduplicated](rust-lang/rust#136458) - [Forbid attributes on `..` inside of struct patterns (`let Struct { #[attribute] .. }) =`](rust-lang/rust#136490) - [Make `ptr_cast_add_auto_to_object` lint into hard error](rust-lang/rust#136764) - Many `std::arch` intrinsics are now safe to call in some contexts, there may now be new `unused_unsafe` warnings in existing codebases. - [Limit `width` and `precision` formatting options to 16 bits on all targets](rust-lang/rust#136932) - [Turn order dependent trait objects future incompat warning into a hard error](rust-lang/rust#136968) - [Denote `ControlFlow` as `#[must_use]`](rust-lang/rust#137449) - [Windows: The standard library no longer links `advapi32`, except on win7.](rust-lang/rust#138233) Code such as C libraries that were relying on this assumption may need to explicitly link advapi32. - [Proc macros can no longer observe expanded `cfg(true)` attributes.](rust-lang/rust#138844) - [Start changing the internal representation of pasted tokens](rust-lang/rust#124141). Certain invalid declarative macros that were previously accepted in obscure circumstances are now correctly rejected by the compiler. Use of a `tt` fragment specifier can often fix these macros. - [Don't allow flattened format_args in const.](rust-lang/rust#139624) <a id="1.87.0-Internal-Changes"></a> ## Internal Changes These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Update to LLVM 20](rust-lang/rust#135763) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this MR, check this box --- This MR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MC4xMS4xOSIsInVwZGF0ZWRJblZlciI6IjQwLjExLjE5IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJSZW5vdmF0ZSBCb3QiXX0=-->
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Pkgsrc changes: * patches adjustments to adapt to upstream changes & new versions of included crates * associated checksums++ Upstream changes relative to 1.86.0: Version 1.87.0 (2025-05-15) ========================== Language -------- - [Stabilize `asm_goto` feature] (rust-lang/rust#133870) - [Allow parsing open beginning ranges (`..EXPR`) after unary operators `!`, `~`, `-`, and `*`}] (rust-lang/rust#134900). - [Don't require method impls for methods with `Self: Sized` bounds in `impl`s for unsized types] (rust-lang/rust#135480) - [Stabilize `feature(precise_capturing_in_traits)` allowing `use<...>` bounds on return position `impl Trait` in `trait`s] (rust-lang/rust#138128) Compiler -------- - [x86: make SSE2 required for i686 targets and use it to pass SIMD types] (rust-lang/rust#135408) Platform Support ---------------- - [Remove `i586-pc-windows-msvc` target] (rust-lang/rust#137957) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. [platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html Libraries --------- - [Stabilize the anonymous pipe API] (rust-lang/rust#127154) - [Add support for unbounded left/right shift operations] (rust-lang/rust#129375) - [Print pointer metadata in `Debug` impl of raw pointers] (rust-lang/rust#135080) - [`Vec::with_capacity` guarantees it allocates with the amount requested, even if `Vec::capacity` returns a different number.] (rust-lang/rust#135933) - Most `std::arch` intrinsics which don't take pointer arguments can now be called from safe code if the caller has the appropriate target features already enabled (rust-lang/stdarch#1714, rust-lang/stdarch#1716, rust-lang/stdarch#1717) - [Undeprecate `env::home_dir`] (rust-lang/rust#137327) - [Denote `ControlFlow` as `#[must_use]`] (rust-lang/rust#137449) - [Macros such as `assert_eq!` and `vec!` now support `const {...}` expressions] (rust-lang/rust#138162) Stabilized APIs --------------- - [`Vec::extract_if`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.extract_if) - [`vec::ExtractIf`] (https://doc.rust-lang.org/stable/std/vec/struct.ExtractIf.html) - [`LinkedList::extract_if`] (https://doc.rust-lang.org/stable/std/collections/struct.LinkedList.html#method.extract_if) - [`linked_list::ExtractIf`] (https://doc.rust-lang.org/stable/std/collections/linked_list/struct.ExtractIf.html) - [`<[T]>::split_off`] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off) - [`<[T]>::split_off_mut`] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_mut) - [`<[T]>::split_off_first`] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_first) - [`<[T]>::split_off_first_mut`] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_first_mut) - [`<[T]>::split_off_last`] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_last) - [`<[T]>::split_off_last_mut`] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_last_mut) - [`String::extend_from_within`] (https://doc.rust-lang.org/stable/alloc/string/struct.String.html#method.extend_from_within) - [`os_str::Display`] (https://doc.rust-lang.org/stable/std/ffi/os_str/struct.Display.html) - [`OsString::display`] (https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.display) - [`OsStr::display`] (https://doc.rust-lang.org/stable/std/ffi/struct.OsStr.html#method.display) - [`io::pipe`] (https://doc.rust-lang.org/stable/std/io/fn.pipe.html) - [`io::PipeReader`] (https://doc.rust-lang.org/stable/std/io/struct.PipeReader.html) - [`io::PipeWriter`] (https://doc.rust-lang.org/stable/std/io/struct.PipeWriter.html) - [`impl From<PipeReader> for OwnedHandle`] (https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html#impl-From%3CPipeReader%3E-for-OwnedHandle) - [`impl From<PipeWriter> for OwnedHandle`] (https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html#impl-From%3CPipeWriter%3E-for-OwnedHandle) - [`impl From<PipeReader> for Stdio`] (https://doc.rust-lang.org/stable/std/process/struct.Stdio.html) - [`impl From<PipeWriter> for Stdio`] (https://doc.rust-lang.org/stable/std/process/struct.Stdio.html#impl-From%3CPipeWriter%3E-for-Stdio) - [`impl From<PipeReader> for OwnedFd`] (https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html#impl-From%3CPipeReader%3E-for-OwnedFd) - [`impl From<PipeWriter> for OwnedFd`] (https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html#impl-From%3CPipeWriter%3E-for-OwnedFd) - [`Box<MaybeUninit<T>>::write`] (https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.write) - [`impl TryFrom<Vec<u8>> for String`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#impl-TryFrom%3CVec%3Cu8%3E%3E-for-String) - [`<*const T>::offset_from_unsigned`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from_unsigned) - [`<*const T>::byte_offset_from_unsigned`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.byte_offset_from_unsigned) - [`<*mut T>::offset_from_unsigned`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from_unsigned-1) - [`<*mut T>::byte_offset_from_unsigned`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.byte_offset_from_unsigned-1) - [`NonNull::offset_from_unsigned`] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.offset_from_unsigned) - [`NonNull::byte_offset_from_unsigned`] (https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.byte_offset_from_unsigned) - [`<uN>::cast_signed`] (https://doc.rust-lang.org/stable/std/primitive.usize.html#method.cast_signed) - [`NonZero::<uN>::cast_signed`] (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.cast_signed-5). - [`<iN>::cast_unsigned`] (https://doc.rust-lang.org/stable/std/primitive.isize.html#method.cast_unsigned). - [`NonZero::<iN>::cast_unsigned`] (https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.cast_unsigned-5). - [`<uN>::is_multiple_of`] (https://doc.rust-lang.org/stable/std/primitive.usize.html#method.is_multiple_of) - [`<uN>::unbounded_shl`] (https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unbounded_shl) - [`<uN>::unbounded_shr`] (https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unbounded_shr) - [`<iN>::unbounded_shl`] (https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unbounded_shl) - [`<iN>::unbounded_shr`] (https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unbounded_shr) - [`<iN>::midpoint`] (https://doc.rust-lang.org/stable/std/primitive.isize.html#method.midpoint) - [`<str>::from_utf8`] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8) - [`<str>::from_utf8_mut`] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8_mut) - [`<str>::from_utf8_unchecked`] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8_unchecked) - [`<str>::from_utf8_unchecked_mut`] (https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8_unchecked_mut) These previously stable APIs are now stable in const contexts: - [`core::str::from_utf8_mut`] (https://doc.rust-lang.org/stable/std/str/fn.from_utf8_mut.html) - [`<[T]>::copy_from_slice`] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.copy_from_slice) - [`SocketAddr::set_ip`] (https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.set_ip) - [`SocketAddr::set_port`] (https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.set_port), - [`SocketAddrV4::set_ip`] (https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.set_ip) - [`SocketAddrV4::set_port`] (https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.set_port), - [`SocketAddrV6::set_ip`] (https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_ip) - [`SocketAddrV6::set_port`] (https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_port) - [`SocketAddrV6::set_flowinfo`] (https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_flowinfo) - [`SocketAddrV6::set_scope_id`] (https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_scope_id) - [`char::is_digit`] (https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_digit) - [`char::is_whitespace`] (https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_whitespace) - [`<[[T; N]]>::as_flattened`] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_flattened) - [`<[[T; N]]>::as_flattened_mut`] (https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_flattened_mut) - [`String::into_bytes`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.into_bytes) - [`String::as_str`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_str) - [`String::capacity`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.capacity) - [`String::as_bytes`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_bytes) - [`String::len`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.len) - [`String::is_empty`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.is_empty) - [`String::as_mut_str`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_mut_str) - [`String::as_mut_vec`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_mut_vec) - [`Vec::as_ptr`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_ptr) - [`Vec::as_slice`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_slice) - [`Vec::capacity`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.capacity) - [`Vec::len`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.len) - [`Vec::is_empty`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.is_empty) - [`Vec::as_mut_slice`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_mut_slice) - [`Vec::as_mut_ptr`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_mut_ptr) Cargo ----- - [Add terminal integration via ANSI OSC 9;4 sequences] (rust-lang/cargo#14615) - [chore: bump openssl to v3] (rust-lang/cargo#15232) - [feat(package): add --exclude-lockfile flag] (rust-lang/cargo#15234) Compatibility Notes ------------------- - [Rust now raises an error for macro invocations inside the `#![crate_name]` attribute] (rust-lang/rust#127581) - [Unstable fields are now always considered to be inhabited] (rust-lang/rust#133889) - [Macro arguments of unary operators followed by open beginning ranges may now be matched differently] (rust-lang/rust#134900) - [Make `Debug` impl of raw pointers print metadata if present] (rust-lang/rust#135080) - [Warn against function pointers using unsupported ABI strings in dependencies] (rust-lang/rust#135767) - [Associated types on `dyn` types are no longer deduplicated] (rust-lang/rust#136458) - [Forbid attributes on `..` inside of struct patterns (`let Struct { #[attribute] .. }) =`] (rust-lang/rust#136490) - [Make `ptr_cast_add_auto_to_object` lint into hard error] (rust-lang/rust#136764) - Many `std::arch` intrinsics are now safe to call in some contexts, there may now be new `unused_unsafe` warnings in existing codebases. - [Limit `width` and `precision` formatting options to 16 bits on all targets] (rust-lang/rust#136932) - [Turn order dependent trait objects future incompat warning into a hard error] (rust-lang/rust#136968) - [Denote `ControlFlow` as `#[must_use]`] (rust-lang/rust#137449) - [Windows: The standard library no longer links `advapi32`, except on win7.] (rust-lang/rust#138233) Code such as C libraries that were relying on this assumption may need to explicitly link advapi32. - [Proc macros can no longer observe expanded `cfg (true)` attributes.](rust-lang/rust#138844) - [Start changing the internal representation of pasted tokens] (rust-lang/rust#124141). Certain invalid declarative macros that were previously accepted in obscure circumstances are now correctly rejected by the compiler. Use of a `tt` fragment specifier can often fix these macros. - [Don't allow flattened format_args in const.] (rust-lang/rust#139624) Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Update to LLVM 20] (rust-lang/rust#135763)
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Fixes #139136
Fixes #139621
We allow
format_args!("a")in const, but don't allow any format_args with arguments in const, such asformat_args!("{}", arg).However, we accidentally allow
format_args!("hello {}", "world")in const, as it gets flattened toformat_args!("hello world").This also applies to panic in const.
This wasn't supposed to happen. I added protection against this in the format args flattening code,
but I accidentally marked a function as const that shouldn't have been constbut this was removed in #135139.This is a breaking change. The crater found no breakage, however.
This breaks things like:
and