size_of_val_raw: for length 0 this is safe to call #126152

RalfJung · 2024-06-08T09:36:25Z

For motivation, see rust-lang/unsafe-code-guidelines#465, specifically around here.
Cc @rust-lang/opsem

rustbot · 2024-06-08T09:36:33Z

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compiler-errors · 2024-06-08T15:24:10Z

library/core/src/mem/mod.rs

@@ -506,6 +512,8 @@ pub const fn align_of_val<T: ?Sized>(val: &T) -> usize {
 ///     - a [slice], then the length of the slice tail must be an initialized
 ///       integer, and the size of the *entire value*
 ///       (dynamic tail length + statically sized prefix) must fit in `isize`.
+///       For the special case where the dynamic tail length is 0, this function


Are we missing tests exercising this specifically (in the "success" sense, perhaps miri tests or a run-pass test w/ an assert_eq!)?

This PR adds the relevant test. I don't think there's a useful "success" test here, what do you have in mind?

Like, when we're calling size_of_val_raw on a struct with a tail who is a slice of size zero or something and the pointer is invalid or something (is that what this is guaranteeing??).

I just think it's weird that we're adding assumptions guaranteeing additional special cases for safety here, but adding tests that guarantee an error. I think that's because of the note you had above:

NOTE: the reason this is safe is that if an overflow were to occur already with size 0, then we would stop compilation as even the "statically known" part of the type would already be too big (or the call may be in dead code and optimized away, but then it doesn't matter).

but I'm just confused why a "negative" test is guaranteed for a new "positive" property, if you see what I mean.

Yeah I can see how that's confusing. But a test that just checks that size_of_val_raw returns the right result for some small slice seems entirely pointless to me, the functionality of that intrinsic is already covered by existing tests. This includes all the Miri tests that use size_of_val/size_of_val_raw. The key point is that compilation is guaranteed to fail if an overflow were to happen, and that's what the new test ensures.

RalfJung · 2024-07-06T11:03:12Z

@rust-lang/opsem could someone take a look at this?

Also r? @compiler-errors since you already started reviewing anyway, I hope that's okay. :)

compiler-errors · 2024-07-09T20:32:13Z

did the relevant team approve this (opsem? lang?)? does this need an fcp?

compiler-errors · 2024-07-09T20:32:38Z

I'm almost certainly not the right person to review a mostly libs documentation change

compiler-errors · 2024-07-09T20:32:58Z

assigning to a random opsem person

r? saethlin

tests/ui/layout/size-of-val-raw-too-big.rs

saethlin · 2024-07-09T22:53:10Z

Doc changes are fine with me, I'm just wary of more no_core 🙈

@rustbot author

RalfJung · 2024-07-10T06:33:05Z

did the relevant team approve this (opsem? lang?)? does this need an fcp?

Hm good point, maybe this should have t-opsem FCP? Or t-lang?
It seems rather obvious that adding 0 can't overflow so what this mostly does is cementing the current implementation detail of how layout.size on unsized types and how it is computed.

RalfJung · 2024-07-10T10:38:29Z

@rustbot ready

rfcbot · 2024-07-20T13:58:59Z

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.

RalfJung · 2024-07-21T17:15:44Z

@saethlin anything left to do here before we land this? :)

saethlin · 2024-07-21T18:06:19Z

Oops, I forgot I was the reviewer.

I see that this appeared in the agenda for the lang meeting last week, but the meeting didn't get to that part of the agenda. 🤷 If you think that counts a chance to intervene, r=me.

RalfJung · 2024-07-21T18:35:50Z

Ah, yes, this was waiting for the lang team still, good point. I'll update the status.

joshtriplett · 2024-07-24T15:11:09Z

We discussed this in today's lang team meeting. Consensus: lang team has no concerns here, please go ahead, and thank you.

RalfJung · 2024-07-24T15:25:32Z

Thanks!

@bors r=saethlin

bors · 2024-07-24T15:25:35Z

📌 Commit 287b66b has been approved by saethlin

It is now in the queue for this repository.

…iaskrgr Rollup of 9 pull requests Successful merges: - rust-lang#126152 (size_of_val_raw: for length 0 this is safe to call) - rust-lang#127252 (Add edge-case examples to `{count,leading,trailing}_{ones,zeros}` methods) - rust-lang#127374 (Tweak "wrong # of generics" suggestions) - rust-lang#127457 (Make tidy fast without compromising case alternation) - rust-lang#127480 (Fix build failure on vxworks rust-lang#127084 ) - rust-lang#127733 (Replace some `mem::forget`'s with `ManuallyDrop`) - rust-lang#128120 (Gate `AsyncFn*` under `async_closure` feature) - rust-lang#128131 (Import `c_void` rather than using the full path) - rust-lang#128133 (Improve spans on evaluated `cfg_attr`s.) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of rust-lang#126152 - RalfJung:size_of_val_raw, r=saethlin size_of_val_raw: for length 0 this is safe to call For motivation, see rust-lang/unsafe-code-guidelines#465, specifically around [here](rust-lang/unsafe-code-guidelines#465 (comment)). Cc `@rust-lang/opsem`

Previously, we needed to rely on the fact that the instance of any valid Rust type with 0 elements has a size (in number of bytes) which is not greater than `isize::MAX`. Providing this as a guarantee turned out to be controversial. [1] This was made possible by rust-lang/rust#126152. [1] rust-lang/unsafe-code-guidelines#465 (comment)

9cc3bc6 custom MIR: add support for tail calls 5674d1c Auto merge of rust-lang#128673 - matthiaskrgr:rollup-gtvpkm7, r=matthiaskrgr deb1d75 Rollup merge of rust-lang#128619 - glandium:last_chunk, r=scottmcm 6449537 Rollup merge of rust-lang#128609 - swenson:smaller-faster-dragon, r=Amanieu acb2c30 Rollup merge of rust-lang#128026 - devnexen:available_parallelism_vxworks, r=Mark-Simulacrum 89fe6df Rollup merge of rust-lang#128309 - kmicklas:btreeset-cursor, r=Amanieu 313484b Correct the const stabilization of `<[T]>::last_chunk` 22e026b Auto merge of rust-lang#128534 - bjorn3:split_stdlib_workspace, r=Mark-Simulacrum 1813603 Rollup merge of rust-lang#128526 - tshepang:patch-1, r=Amanieu e8a1a41 Auto merge of rust-lang#128466 - sayantn:stdarch-update, r=tgross35 2adf9da Update stdarch dc85bdb Chore: add `x86_amx_intrinsics` feature flag to `core/lib.rs` and remove `issue-120720-reduce-nan.rs` e88b04d Rollup merge of rust-lang#128551 - Konippi:refactor-backtrace-style-in-panic, r=tgross35 43a1e93 Rollup merge of rust-lang#128530 - scottmcm:repeat-n-unchecked, r=joboet 47df194 Remove unnecessary constants from flt2dec dragon 0b5f1b8 Auto merge of rust-lang#128404 - compiler-errors:revert-dead-code-changes, r=pnkfelix 35cd95f Suppress new false-negatives that were masked by dead code analysis changes 9eb9fa6 Revert "Rollup merge of rust-lang#127107 - mu001999-contrib:dead/enhance-2, r=pnkfelix" 975dc19 Rollup merge of rust-lang#128368 - nnethercote:rustfmt-tweaks, r=cuviper 0ee09fe Rollup merge of rust-lang#128303 - NobodyXu:specialise-for-pipe, r=cuviper 1967a12 Rollup merge of rust-lang#127586 - zachs18:more-must-use, r=cuviper fc53324 Rollup merge of rust-lang#126704 - sayantn:sha, r=Amanieu 74dd96f chore: refactor backtrace style in panic 0e4358d Auto merge of rust-lang#128528 - workingjubilee:you-dont-need-to-see-this-cpuid-move-along, r=Amanieu 9fa74ab Move the standard library to a separate workspace e13d132 Auto merge of rust-lang#128254 - Amanieu:orig-binary-search, r=tgross35 05d8d7c Implement `UncheckedIterator` directly for `RepeatN` a5fa13e Rollup merge of rust-lang#128491 - c410-f3r:unlock-rfc-2011, r=workingjubilee 28e4d22 Rollup merge of rust-lang#128453 - RalfJung:raw_eq, r=saethlin db770c6 std: Remove has_cpuid 39aad04 time.rs: remove "Basic usage text" 7df583c Dogfood cb11051 Add the `sha512`, `sm3` and `sm4` target features 86ea79f Fix mutability in doc tests for `BTreeSet` cursors c7be27f Introduce `Cursor`/`CursorMut`/`CursorMutKey` thrichotomy for `BTreeSet` like map API 8835b0f Fix some uses of "map" instead of "set" in `BTreeSet` cursor API docs 07f64a8 Share `UnorderedKeyError` with `BTReeMap` for set API f859e54 Rollup merge of rust-lang#128499 - Konippi:refactor-backtrace-formatting, r=tgross35 fb966d2 Rollup merge of rust-lang#128497 - Bryanskiy:fix-dropck-doc, r=lcnr ab00ae6 Rollup merge of rust-lang#128433 - hermit-os:hermit-unsafe_op_in_unsafe_fn, r=joboet 2614bd2 chore: refactor backtrace formatting a8a4659 fix dropck documentation for `[T;0]` special-case 589c0a0 fix(os/hermit): `deny(unsafe_op_in_unsafe_fn)` 0260e47 fix(pal/hermit): `deny(unsafe_op_in_unsafe_fn)` 7bd6b11 refactor(pal/hermit): make `ENV` a non-mutable static 32894e2 Rollup merge of rust-lang#128416 - maurer:remove-android-hack, r=tgross35 beb76c3 Auto merge of rust-lang#128461 - matthiaskrgr:rollup-3dpp11g, r=matthiaskrgr 1e3976b Rollup merge of rust-lang#128162 - ChrisDenton:cleanup, r=joboet cde45b0 Rollup merge of rust-lang#127567 - joboet:once_wait, r=Amanieu 0607642 Fix docs for OnceLock::get_mut_or_init da48417 raw_eq: using it on bytes with provenance is not UB (outside const-eval) cc6f37f std: fix busy-waiting in `Once::wait_force`, add more tests 6fd82f1 std: implement the `once_wait` feature 0c56873 Remove unneeded `pub(crate)` 787a1f7 Rollup merge of rust-lang#128388 - beetrees:f16-f128-slightly-improve-windows-abi, r=tgross35 e3a4ed3 Rollup merge of rust-lang#128387 - liigo:patch-14, r=tgross35 8b7f4ee refactor(pal/hermit): use default impl of `GlobalAlloc::alloc_zeroed` c337019 refactor(pal/hermit): return `!` to satisfy rust-analyzer 7aafdcf android: Remove libstd hacks for unsupported Android APIs ba65c6c Move Windows implementation of anon pipe 176508c Match LLVM ABI in `extern "C"` functions for `f128` on Windows 85e4ba0 Cleanup sys module to match house style ddff2b6 Auto merge of rust-lang#128083 - Mark-Simulacrum:bump-bootstrap, r=albertlarsan68 e4b0e6d Rewrite binary search implementation 556dc60 More detailed note to deprecate ONCE_INIT 440ec83 Auto merge of rust-lang#128378 - matthiaskrgr:rollup-i3qz9uo, r=matthiaskrgr a50fe57 Auto merge of rust-lang#128250 - Amanieu:select_unpredictable, r=nikic 47f9d61 Rollup merge of rust-lang#128315 - zetanumbers:psvita-unsafe-in-unsafe, r=workingjubilee f70ce7f Auto merge of rust-lang#128234 - jcsp:retain-empty-case, r=tgross35 93b2f7c Insert some blank lines. db0222e Move a comment. cc96f3e Stabilize offset_of_nested 618fdd5 Auto merge of rust-lang#128334 - matthiaskrgr:rollup-nhxdt0c, r=matthiaskrgr e088cb1 Rollup merge of rust-lang#128333 - RalfJung:miri-sync, r=RalfJung 1ea0493 Rollup merge of rust-lang#128307 - ojeda:unescaped_backticks, r=GuillaumeGomez 5d51099 Optimize empty case in Vec::retain f2bcbec Auto merge of rust-lang#125016 - nicholasbishop:bishop-cb-112, r=tgross35 7a43feb Rollup merge of rust-lang#128310 - kmicklas:btree-map-peek-next-docs, r=tgross35 03e5078 Rollup merge of rust-lang#128055 - workingjubilee:deny-unsafe-ops-in-sys-personality-dwarf-eh, r=Amanieu f9befad Rollup merge of rust-lang#109174 - soerenmeier:cursor_fns, r=dtolnay ed7d02f Update compiler_builtins to 0.1.114 80254cd Warn on `rustdoc::unescaped_backticks` for `core/alloc/std/test/proc_macro` c8db8ea Remove spurious backticks detected by `rustdoc::unescaped_backticks` d1d4fb3 Reformat `use` declarations. 3ec244f Replace `io::Cursor::{remaining_slice, is_empty}` with `io::Cursor::{split, split_mut}` abc611f step cfg(bootstrap) 78cd779 Update CURRENT_RUSTC_VERSION 70927dc Add forbid(unsafe_op_in_unsafe_fn) 06a22c9 Rollup merge of rust-lang#128240 - mbrubeck:patch-3, r=joboet 604d618 Rollup merge of rust-lang#128228 - slanterns:const_waker, r=dtolnay,oli-obk 2a70839 Rollup merge of rust-lang#128103 - folkertdev:unsigned-int-is-multiple-of, r=Amanieu 058f1d3 Rollup merge of rust-lang#127765 - bitfield:fix_stdlib_doc_nits, r=dtolnay 9a6c84e fix: psvita's std code 5119266 Force LLVM to use CMOV for binary search d6b6e63 stabilize const_waker 8e4f58a Add missing periods on `BTreeMap` cursor `peek_next` docs 458b9b0 Implement cursors for `BTreeSet` 02bf0de Enable `std::io::copy` specialisation for `std::pipe::{PipeReader, PipeWriter}` 1f83bf3 Rollup merge of rust-lang#128282 - pitaj:nonzero_bitwise, r=workingjubilee 357ff7a Rollup merge of rust-lang#128279 - slanterns:is_sorted, r=dtolnay fcbdcae stabilize `is_sorted` c47f8bd bitwise and bytewise methods on `NonZero` 4ea98d7 Rollup merge of rust-lang#128259 - sunshowers:msg-nosignal, r=Mark-Simulacrum d6f970a Rollup merge of rust-lang#125897 - RalfJung:from-ref, r=Amanieu 339f756 Auto merge of rust-lang#128255 - stepancheg:doc-shl, r=scottmcm 0d6a7dd Merge from rustc a66bc79 Auto merge of rust-lang#127946 - tgross35:fmt-builders-set-result, r=cuviper 2986bfe [illumos/solaris] set MSG_NOSIGNAL while writing to sockets 3e85493 Document int.checked_shl(BITS - 1) 59f3fef Rollup merge of rust-lang#128235 - harryscholes:fix-iterator-filter-docs, r=tgross35 a2dbfd3 Rollup merge of rust-lang#124941 - Skgland:stabilize-const-int-from-str, r=dtolnay 5b78bae Add links from `assert_eq!` docs to `debug_assert_eq!`, etc. a0f135d Always set `result` during `finish()` in debug builders bd11b3d Fix docs 22ce603 Auto merge of rust-lang#128165 - saethlin:optimize-clone-shims, r=compiler-errors fb7d2a8 Fix doc nits a152820 Rollup merge of rust-lang#128170 - saethlin:clone-fn, r=compiler-errors 0d63614 Merge from rustc cb8f69b Rollup merge of rust-lang#128211 - juliusl:pr/align-change-time, r=tgross35 ba0582b Rollup merge of rust-lang#128150 - BoxyUwU:std_only_sized_const_params, r=workingjubilee 30cfde4 Rollup merge of rust-lang#127950 - nnethercote:rustfmt-skip-on-use-decls, r=cuviper 8488ae6 Make Clone::clone a lang item 1342ef1 fix: compilation issue w/ refactored type 92c0ad7 Let InstCombine remove Clone shims inside Clone shims c788415 Stop using `unsized_const_parameters` in core/std ef4d4a0 Auto merge of rust-lang#128195 - matthiaskrgr:rollup-195dfdf, r=matthiaskrgr 5b6c1e1 Rollup merge of rust-lang#128137 - GrigorenkoPV:cstr-derive, r=dtolnay aaeac06 Rollup merge of rust-lang#127999 - ChrisDenton:arm32, r=Amanieu ea3a99f Rollup merge of rust-lang#128158 - workingjubilee:unsafe-wrap-personality-gcc, r=ChrisDenton 886fe5b Rollup merge of rust-lang#127300 - biabbas:fix_connect_timeout, r=tgross35 b889a1d CStr: derive PartialEq, Eq; add test for Ord 3a18110 In connect timeout, read readiness of socket for vxworks. Check pollhup or pollerr for refused connections in linux c4ee91f Merge from rustc 244d843 std: update comments on gcc personality fn d252b6b std: unsafe-wrap gcc::rust_eh_personality and impl 09bda4f Rollup merge of rust-lang#128135 - joboet:reduplicate_tls, r=tgross35 a4c88bc Rollup merge of rust-lang#128046 - GrigorenkoPV:90435, r=tgross35 2614d86 Rollup merge of rust-lang#126548 - rik86189:issue-88264-fix, r=tgross35 75a178f Rollup merge of rust-lang#126042 - davidzeng0:master, r=Amanieu 1e118ae Rollup merge of rust-lang#128131 - ChrisDenton:stuff, r=workingjubilee cea2ca9 Rollup merge of rust-lang#128120 - compiler-errors:async-fn-name, r=oli-obk 92e3688 Rollup merge of rust-lang#127733 - GrigorenkoPV:don't-forget, r=Amanieu 9b1cffd Rollup merge of rust-lang#127480 - biabbas:vxworks, r=workingjubilee 2632261 Rollup merge of rust-lang#127252 - fitzgen:edge-cases-for-bitwise-operations, r=m-ou-se b0d7414 Rollup merge of rust-lang#126152 - RalfJung:size_of_val_raw, r=saethlin 6d0b714 Improved clarity of documentation for std::fs::create_dir_all eb79e09 std: use duplicate thread local state in tests 8456a97 Forbid unsafe_op_in_unsafe_fn in sys/pal/windows 5a9fb1f Import `core::ffi::c_void` in more places 16450f7 Merge from rustc 697c717 Add chroot unsupported implementation for VxWorks 6242470 Rollup merge of rust-lang#128106 - hallfox:patch-1, r=ChrisDenton de086ea Rollup merge of rust-lang#128092 - ChrisDenton:wrappers, r=workingjubilee ccba33c Rollup merge of rust-lang#128043 - safinaskar:primitive, r=workingjubilee a069998 Rollup merge of rust-lang#127481 - a1phyr:pattern_gat, r=Amanieu bc7345c Rollup merge of rust-lang#126770 - wr7:master, r=Amanieu 21f6b65 Rollup merge of rust-lang#125962 - Coekjan:const-binary-heap, r=Amanieu eee5bba Auto merge of rust-lang#127153 - NobodyXu:pipe, r=ChrisDenton fd3a45f Gate AsyncFn* under async_closure feature 0374ea2 Add elem_offset and related methods 2b3eacb library/core/src/primitive.rs: small doc fix 45f80e6 Fix return type of FileAttr methods on AIX target 6cabb65 add `is_multiple_of` for unsigned integer types 4c4a93a Initial implementation of anonymous_pipe 63d2997 Update process vxworks, set default stack size of 256 Kib for vxworks. User can set the stack size using RUST_MIN_STACK, with min size of libc::PTHREAD_STACK_MIN(4kib) ee86041 Rollup merge of rust-lang#128089 - workingjubilee:commonly-wrapped-to-make-safe, r=ChrisDenton ad9a52d Rollup merge of rust-lang#125834 - workingjubilee:weaken-thir-unsafeck-for-addr-of-static-mut, r=compiler-errors 642c69b Remove wrapper functions from c.rs de2a037 std: Unsafe-wrap backtrace code held in-common 155aef9 std: Unsafe-wrap alloc code held in-common bee0155 Cfg disable on_broken_pipe_flag_used() for vxworks 227b5af Disable dirfd for vxworks, Return unsupported error from set_times and lchown for vxworks 22a6797 Allow unused unsafe for vxworks in read_at and write at 8be45a9 Docs for core::primitive: mention that "core" can be shadowed, too, so we should write "::core" c039ee8 library: vary unsafety in bootstrapping for SEH 6765b97 std: unsafe-wrap personality::dwarf::eh 7ae76f0 Rollup merge of rust-lang#128008 - weiznich:fix/121521, r=lcnr 323e962 Rollup merge of rust-lang#127996 - ian-h-chamberlain:fix/horizon-warnings-unsafe-in-unsafe, r=tgross35 ae6187f Rollup merge of rust-lang#127415 - AljoschaMeyer:master, r=dtolnay d6a36f5 Use given allocator instad of Global d0bc9a0 Start using `#[diagnostic::do_not_recommend]` in the standard library ba43261 Rollup merge of rust-lang#127583 - Nilstrieb:invalid-utf8, r=joboet 0727e53 Fix warnings when checking armv6k-nintendo-3ds bbe4da8 Fix some `#[cfg_attr(not(doc), repr(..))]` 321dbf8 Deal with invalid UTF-8 from `gai_strerror` 6aa00e1 std::thread: available_parallelism implementation for vxWorks proposal. 2fff48d Auto merge of rust-lang#127722 - BoxyUwU:new_adt_const_params_limitations, r=compiler-errors d7770e9 Rollup merge of rust-lang#128005 - ChrisDenton:msvc-include, r=joboet 8fdee23 Rollup merge of rust-lang#127734 - ChrisDenton:netc, r=Mark-Simulacrum 3b2536e Remove _tls_used hack 07dbb38 Rollup merge of rust-lang#127873 - workingjubilee:forbid-unsafe-ops-for-kmc-solid, r=Amanieu bd26295 Rollup merge of rust-lang#127843 - workingjubilee:break-up-big-ass-stack-overflow-fn, r=joboet 00b4f61 Inject win arm32 shims into metadata generation 2b62867 Rollup merge of rust-lang#127918 - ChrisDenton:thread-name-string, r=joboet a077eb1 Rollup merge of rust-lang#123196 - Ayush1325:uefi-process, r=joboet eb09be4 std: forbid unwrapped unsafe in unsupported_backslash dcb9854 kmc-solid: forbid(unsafe_op_in_unsafe_fn) 845a2f7 Auto merge of rust-lang#127982 - matthiaskrgr:rollup-nzyvphj, r=matthiaskrgr 00d6fc4 Rollup merge of rust-lang#127978 - nyurik:lib-refs, r=workingjubilee 4d8afcd Avoid ref when using format! for perf 9f20a0f Rollup merge of rust-lang#126199 - ivan-shrimp:nonzero_isqrt, r=tgross35 f06530c Rollup merge of rust-lang#112328 - juliusl:pr/windows-add-change-time, r=ChrisDenton 8d5cf50 uefi: process: Fixes from PR c6cb67c uefi: process: Final Touchups afe1ef0 uefi: process: Add CommandArgs support ef6b173 uefi: process: Add support for args 1991fe3 uefi: process Implement inherit 24a9582 uefi: process: Add null protocol 36a0e1e uefi: process: Add stderr support b712e74 uefi: process: Add support to capture stdout e6eeb4e uefi: Add process f3b1c8a improve safety comment 9348998 add `NonZero<uN>::isqrt` edc4cdc Use `#[rustfmt::skip]` on some `use` groups to prevent reordering. 489f1ef unix: acquire-load NEED_ALTSTACK 9e11e01 unix: Unsafe-wrap stack_overflow::{drop,make}_handler 72c7444 unix: Unsafe-wrap stack_overflow::cleanup 33a32f2 unix: lift init of sigaltstack before sigaction 9fb6e49 unix: Unsafe-wrap stack_overflow::signal_handler c99ebd4 Rollup merge of rust-lang#127594 - c6c7:fuchsia-status-code-match-arm, r=tmandry 8378261 Move ThreadName conversions to &cstr/&str 68e2391 Style change 16bce8a Make `Thread::new_inner` a safe function d1d9893 Rollup merge of rust-lang#127748 - scottmcm:option_len, r=joboet b0c85ba Rollup merge of rust-lang#124881 - Sp00ph:reentrant_lock_tid, r=joboet 7e21850 Update `ReentrantLock` implementation, add `CURRENT_ID` thread local. c10a929 Safely enforce thread name requirements cc4ed95 Rollup merge of rust-lang#127077 - tbu-:pr_doc_fd_to_owned, r=workingjubilee 37d7bff Rollup merge of rust-lang#127861 - Kriskras99:patch-1, r=tgross35 3d50720 Rollup merge of rust-lang#127859 - RalfJung:ptr-dyn-metadata, r=scottmcm 1f3311b Rollup merge of rust-lang#127845 - workingjubilee:actually-break-up-big-ass-stack-overflow-fn, r=joboet 5578593 Auto merge of rust-lang#127865 - matthiaskrgr:rollup-8m49dlg, r=matthiaskrgr 54728b1 feat: adding ext that returns change_time for Windows b164bab Auto merge of rust-lang#125942 - timokroeger:windows-once-futex, r=ChrisDenton 0eda3a3 Rollup merge of rust-lang#127337 - celinval:intrinsics-fallback, r=oli-obk ed3c6d1 Mention how you can go from `BorrowedFd` to `OwnedFd` and back 455bd57 Make language around `ToOwned` for `BorrowedFd` more precise ab7a0d4 Document the column numbers for the dbg! macro 89cd225 ptr::metadata: update comment on vtable_ptr work-around 51e54a4 ptr::metadata: avoid references to extern types be0c06b Split part of `adt_const_params` into `unsized_const_params` 857ed93 Forbid `!Sized` types and references aedc16c unix: unsafe-wrap install_main_guard_default 4db3aa1 unix: clean up install_main_guard_freebsd d167f00 unix: stack_start_aligned is a safe fn 27b79e6 unix: split stack_overflow::install_main_guard by os d50143f Update name of Windows abort constant to match platform documentation cbaa831 Add match arm for Fuchsia status code upon an abort in a test f15715f lib: replace some `mem::forget`'s with `ManuallyDrop` 9bbf09d Windows: move BSD socket shims to netc d76c965 Remove generic lifetime parameter of trait `Pattern` ad3db57 Use Option's discriminant as its size hint 3b86ae3 Explicitly ignore `into_raw_handle()` using `let _ =` in sys/pal/windows. 1cb5354 Add `must_use` to IntoRawFd/IntoRawSocket/IntoRawHandle's methods. 697377a Clarify/add `must_use` messages for more `into_raw*` functions of `alloc` types. a7bec56 size_of_val_raw: for length 0 this is safe to call 39c4daa Reset sigpipe not supported for vxworks ca537d2 Fix them doc examples some more be23cef Fix doc examples 8d01996 Run formatter on alloc/src/boxed.rs c3b602a Add missing try_new_uninit_slice_in and try_new_zeroed_slice_in 5487574 Document safety of a few intrinsics 87fcd2f Move a few intrinsics to use Rust abi 6b549ba mark `can_not_overflow` as `#[rustc_const_stable(...)]` 259c058 stabilize `const_int_from_str` 538fe81 Add edge-case examples to `{count,leading,trailing}_{ones,zeros}` methods 5fc66dd Implement `unsigned_signed_diff` dbbb4ab less garbage, more examples 4952644 update tracking issue for `const_binary_heap_new_in` 33389b0 more explicitly state the basic rules of working with the obtained raw pointers 395ad9f Windows: Use futex implementation for `Once` 7953644 from_ref, from_mut: clarify domain of quantification git-subtree-dir: library git-subtree-split: 9cc3bc6

This MR contains the following updates: | Package | Update | Change | |---|---|---| | [rust](https://github.com/rust-lang/rust) | minor | `1.81.0` -> `1.82.0` | 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> ### [`v1.82.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1820-2024-10-17) [Compare Source](rust-lang/rust@1.81.0...1.82.0) \========================== <a id="1.82.0-Language"></a> ## Language - [Don't make statement nonterminals match pattern nonterminals](rust-lang/rust#120221) - [Patterns matching empty types can now be omitted in common cases](rust-lang/rust#122792) - [Enforce supertrait outlives obligations when using trait impls](rust-lang/rust#124336) - [`addr_of(_mut)!` macros and the newly stabilized `&raw (const|mut)` are now safe to use with all static items](rust-lang/rust#125834) - [size_of_val_raw: for length 0 this is safe to call](rust-lang/rust#126152) - [Reorder trait bound modifiers *after* `for<...>` binder in trait bounds](rust-lang/rust#127054) - [Stabilize opaque type precise capturing (RFC 3617)](rust-lang/rust#127672) - [Stabilize `&raw const` and `&raw mut` operators (RFC 2582)](rust-lang/rust#127679) - [Stabilize unsafe extern blocks (RFC 3484)](rust-lang/rust#127921) - [Stabilize nested field access in `offset_of!`](rust-lang/rust#128284) - [Do not require `T` to be live when dropping `[T; 0]`](rust-lang/rust#128438) - [Stabilize `const` operands in inline assembly](rust-lang/rust#128570) - [Stabilize floating-point arithmetic in `const fn`](rust-lang/rust#128596) - [Stabilize explicit opt-in to unsafe attributes](rust-lang/rust#128771) - [Document NaN bit patterns guarantees](rust-lang/rust#129559) <a id="1.82.0-Compiler"></a> ## Compiler - [Promote riscv64gc-unknown-linux-musl to tier 2](rust-lang/rust#122049) - [Promote Mac Catalyst targets `aarch64-apple-ios-macabi` and `x86_64-apple-ios-macabi` to Tier 2, and ship them with rustup](rust-lang/rust#126450) - [Add tier 3 NuttX based targets for RISC-V and ARM](rust-lang/rust#127755) - [Add tier 3 powerpc-unknown-linux-muslspe target](rust-lang/rust#127905) - [Improved diagnostics to explain why a pattern is unreachable](rust-lang/rust#128034) - [The compiler now triggers the unreachable code warning properly for async functions that don't return/are `-> !`](rust-lang/rust#128443) - [Promote `aarch64-apple-darwin` to Tier 1](rust-lang/rust#128592) - [Add Trusty OS target `aarch64-unknown-trusty` and `armv7-unknown-trusty` as tier 3 targets](rust-lang/rust#129490) - [Promote `wasm32-wasip2` to Tier 2.](rust-lang/rust#126967) <a id="1.82.0-Libraries"></a> ## Libraries - [Generalize `{Rc,Arc}::make_mut()` to `Path`, `OsStr`, and `CStr`.](rust-lang/rust#126877) <a id="1.82.0-Stabilized-APIs"></a> ## Stabilized APIs - [`std::thread::Builder::spawn_unchecked`](https://doc.rust-lang.org/stable/std/thread/struct.Builder.html#method.spawn_unchecked) - [`std::str::CharIndices::offset`](https://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.offset) - [`std::option::Option::is_none_or`](https://doc.rust-lang.org/nightly/std/option/enum.Option.html#method.is_none_or) - [`[T]::is_sorted`](https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.is_sorted) - [`[T]::is_sorted_by`](https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.is_sorted_by) - [`[T]::is_sorted_by_key`](https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.is_sorted_by_key) - [`Iterator::is_sorted`](https://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.is_sorted) - [`Iterator::is_sorted_by`](https://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.is_sorted_by) - [`Iterator::is_sorted_by_key`](https://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.is_sorted_by_key) - [`std::future::Ready::into_inner`](https://doc.rust-lang.org/nightly/std/future/struct.Ready.html#method.into_inner) - [`std::iter::repeat_n`](https://doc.rust-lang.org/nightly/std/iter/fn.repeat_n.html) - [`impl<T: Clone> DoubleEndedIterator for Take<Repeat<T>>`](https://doc.rust-lang.org/nightly/std/iter/struct.Take.html#impl-DoubleEndedIterator-for-Take%3CRepeat%3CT%3E%3E) - [`impl<T: Clone> ExactSizeIterator for Take<Repeat<T>>`](https://doc.rust-lang.org/nightly/std/iter/struct.Take.html#impl-ExactSizeIterator-for-Take%3CRepeat%3CT%3E%3E) - [`impl<T: Clone> ExactSizeIterator for Take<RepeatWith<T>>`](https://doc.rust-lang.org/nightly/std/iter/struct.Take.html#impl-ExactSizeIterator-for-Take%3CRepeatWith%3CF%3E%3E) - [`impl Default for std::collections::binary_heap::Iter`](https://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Iter.html#impl-Default-for-Iter%3C'\_,+T%3E) - [`impl Default for std::collections::btree_map::RangeMut`](https://doc.rust-lang.org/nightly/std/collections/btree_map/struct.RangeMut.html#impl-Default-for-RangeMut%3C'\_,+K,+V%3E) - [`impl Default for std::collections::btree_map::ValuesMut`](https://doc.rust-lang.org/nightly/std/collections/btree_map/struct.ValuesMut.html#impl-Default-for-ValuesMut%3C'\_,+K,+V%3E) - [`impl Default for std::collections::vec_deque::Iter`](https://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Iter.html#impl-Default-for-Iter%3C'\_,+T%3E) - [`impl Default for std::collections::vec_deque::IterMut`](https://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.IterMut.html#impl-Default-for-IterMut%3C'\_,+T%3E) - [`Rc<T>::new_uninit`](https://doc.rust-lang.org/nightly/std/rc/struct.Rc.html#method.new_uninit) - [`Rc<T>::assume_init`](https://doc.rust-lang.org/nightly/std/rc/struct.Rc.html#method.assume_init) - [`Rc<[T]>::new_uninit_slice`](https://doc.rust-lang.org/nightly/std/rc/struct.Rc.html#method.new_uninit_slice) - [`Rc<[MaybeUninit<T>]>::assume_init`](https://doc.rust-lang.org/nightly/std/rc/struct.Rc.html#method.assume_init-1) - [`Arc<T>::new_uninit`](https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.new_uninit) - [`Arc<T>::assume_init`](https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.assume_init) - [`Arc<[T]>::new_uninit_slice`](https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.new_uninit_slice) - [`Arc<[MaybeUninit<T>]>::assume_init`](https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.assume_init-1) - [`Box<T>::new_uninit`](https://doc.rust-lang.org/nightly/std/boxed/struct.Box.html#method.new_uninit) - [`Box<T>::assume_init`](https://doc.rust-lang.org/nightly/std/boxed/struct.Box.html#method.assume_init) - [`Box<[T]>::new_uninit_slice`](https://doc.rust-lang.org/nightly/std/boxed/struct.Box.html#method.new_uninit_slice) - [`Box<[MaybeUninit<T>]>::assume_init`](https://doc.rust-lang.org/nightly/std/boxed/struct.Box.html#method.assume_init-1) - [`core::arch::x86_64::_bextri_u64`](https://doc.rust-lang.org/stable/core/arch/x86\_64/fn.\_bextri_u64.html) - [`core::arch::x86_64::_bextri_u32`](https://doc.rust-lang.org/stable/core/arch/x86\_64/fn.\_bextri_u32.html) - [`core::arch::x86::_mm_broadcastsi128_si256`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_broadcastsi128\_si256.html) - [`core::arch::x86::_mm256_stream_load_si256`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm256\_stream_load_si256.html) - [`core::arch::x86::_tzcnt_u16`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_tzcnt_u16.html) - [`core::arch::x86::_mm_extracti_si64`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_extracti_si64.html) - [`core::arch::x86::_mm_inserti_si64`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_inserti_si64.html) - [`core::arch::x86::_mm_storeu_si16`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_storeu_si16.html) - [`core::arch::x86::_mm_storeu_si32`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_storeu_si32.html) - [`core::arch::x86::_mm_storeu_si64`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_storeu_si64.html) - [`core::arch::x86::_mm_loadu_si16`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_loadu_si16.html) - [`core::arch::x86::_mm_loadu_si32`](https://doc.rust-lang.org/stable/core/arch/x86/fn.\_mm_loadu_si32.html) - [`core::arch::wasm32::u8x16_relaxed_swizzle`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u8x16\_relaxed_swizzle.html) - [`core::arch::wasm32::i8x16_relaxed_swizzle`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i8x16\_relaxed_swizzle.html) - [`core::arch::wasm32::i32x4_relaxed_trunc_f32x4`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i32x4\_relaxed_trunc_f32x4.html) - [`core::arch::wasm32::u32x4_relaxed_trunc_f32x4`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u32x4\_relaxed_trunc_f32x4.html) - [`core::arch::wasm32::i32x4_relaxed_trunc_f64x2_zero`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i32x4\_relaxed_trunc_f64x2\_zero.html) - [`core::arch::wasm32::u32x4_relaxed_trunc_f64x2_zero`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u32x4\_relaxed_trunc_f64x2\_zero.html) - [`core::arch::wasm32::f32x4_relaxed_madd`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f32x4\_relaxed_madd.html) - [`core::arch::wasm32::f32x4_relaxed_nmadd`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f32x4\_relaxed_nmadd.html) - [`core::arch::wasm32::f64x2_relaxed_madd`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f64x2\_relaxed_madd.html) - [`core::arch::wasm32::f64x2_relaxed_nmadd`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f64x2\_relaxed_nmadd.html) - [`core::arch::wasm32::i8x16_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i8x16\_relaxed_laneselect.html) - [`core::arch::wasm32::u8x16_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u8x16\_relaxed_laneselect.html) - [`core::arch::wasm32::i16x8_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i16x8\_relaxed_laneselect.html) - [`core::arch::wasm32::u16x8_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u16x8\_relaxed_laneselect.html) - [`core::arch::wasm32::i32x4_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i32x4\_relaxed_laneselect.html) - [`core::arch::wasm32::u32x4_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u32x4\_relaxed_laneselect.html) - [`core::arch::wasm32::i64x2_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i64x2\_relaxed_laneselect.html) - [`core::arch::wasm32::u64x2_relaxed_laneselect`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u64x2\_relaxed_laneselect.html) - [`core::arch::wasm32::f32x4_relaxed_min`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f32x4\_relaxed_min.html) - [`core::arch::wasm32::f32x4_relaxed_max`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f32x4\_relaxed_max.html) - [`core::arch::wasm32::f64x2_relaxed_min`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f64x2\_relaxed_min.html) - [`core::arch::wasm32::f64x2_relaxed_max`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f64x2\_relaxed_max.html) - [`core::arch::wasm32::i16x8_relaxed_q15mulr`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i16x8\_relaxed_q15mulr.html) - [`core::arch::wasm32::u16x8_relaxed_q15mulr`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u16x8\_relaxed_q15mulr.html) - [`core::arch::wasm32::i16x8_relaxed_dot_i8x16_i7x16`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i16x8\_relaxed_dot_i8x16\_i7x16.html) - [`core::arch::wasm32::u16x8_relaxed_dot_i8x16_i7x16`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u16x8\_relaxed_dot_i8x16\_i7x16.html) - [`core::arch::wasm32::i32x4_relaxed_dot_i8x16_i7x16_add`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i32x4\_relaxed_dot_i8x16\_i7x16\_add.html) - [`core::arch::wasm32::u32x4_relaxed_dot_i8x16_i7x16_add`](https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u32x4\_relaxed_dot_i8x16\_i7x16\_add.html) These APIs are now stable in const contexts: - [`std::task::Waker::from_raw`](https://doc.rust-lang.org/nightly/std/task/struct.Waker.html#method.from_raw) - [`std::task::Context::from_waker`](https://doc.rust-lang.org/nightly/std/task/struct.Context.html#method.from_waker) - [`std::task::Context::waker`](https://doc.rust-lang.org/nightly/std/task/struct.Context.html#method.waker) - [`$integer::from_str_radix`](https://doc.rust-lang.org/nightly/std/primitive.u32.html#method.from_str_radix) - [`std::num::ParseIntError::kind`](https://doc.rust-lang.org/nightly/std/num/struct.ParseIntError.html#method.kind) <a id="1.82.0-Cargo"></a> ## Cargo - [feat: Add `info` cargo subcommand](rust-lang/cargo#14141) <a id="1.82.0-Compatibility-Notes"></a> ## Compatibility Notes - We now [disallow setting some built-in cfgs via the command-line](rust-lang/rust#126158) with the newly added [`explicit_builtin_cfgs_in_flags`](https://doc.rust-lang.org/rustc/lints/listing/deny-by-default.html#explicit-builtin-cfgs-in-flags) lint in order to prevent incoherent state, eg. `windows` cfg active but target is Linux based. The appropriate [`rustc` flag](https://doc.rust-lang.org/rustc/command-line-arguments.html) should be used instead. - The standard library has a new implementation of `binary_search` which is significantly improves performance ([#128254](rust-lang/rust#128254)). However when a sorted slice has multiple values which compare equal, the new implementation may select a different value among the equal ones than the old implementation. - [illumos/Solaris now sets `MSG_NOSIGNAL` when writing to sockets](rust-lang/rust#128259). This avoids killing the process with SIGPIPE when writing to a closed socket, which matches the existing behavior on other UNIX targets. - [Removes a problematic hack that always passed the --whole-archive linker flag for tests, which may cause linker errors for code accidentally relying on it.](rust-lang/rust#128400) - The WebAssembly target features `multivalue` and `reference-types` are now both enabled by default. These two features both have subtle changes implied for generated WebAssembly binaries. For the `multivalue` feature, WebAssembly target support has changed when upgrading to LLVM 19. Support for generating functions with multiple returns no longer works and `-Ctarget-feature=+multivalue` has a different meaning than it did in LLVM 18 and prior. There is no longer any supported means to generate a module that has a function with multiple returns in WebAssembly from Rust source code. For the `reference-types` feature the encoding of immediates in the `call_indirect`, a commonly used instruction by the WebAssembly backend, has changed. Validators and parsers which don't understand the `reference-types` proposal will no longer accept modules produced by LLVM due to this change in encoding of immediates. Additionally these features being enabled are encoded in the `target_features` custom section and may affect downstream tooling such as `wasm-opt` consuming the module. Generating a WebAssembly module that disables default features requires `-Zbuild-std` support from Cargo and more information can be found at [rust-lang/rust#128511](rust-lang/rust#128511). - [Rust now raises unsafety errors for union patterns in parameter-position](rust-lang/rust#130531) <a id="1.82.0-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 19](rust-lang/rust#127513) </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. --- - [ ] If you want to rebase/retry this MR, check this box --- This MR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

Pkgsrc changes: * Adapt patches, apply to new vendored crates where needed. * Back-port rust pull request 130110, "make dist vendoring configurable" * Disable "dist vendoring", otherwise cargo would try to access the network during the build phase. Upstream changes: Version 1.82.0 (2024-10-17) ========================== Language -------- - [Don't make statement nonterminals match pattern nonterminals] (rust-lang/rust#120221) - [Patterns matching empty types can now be omitted in common cases] (rust-lang/rust#122792) - [Enforce supertrait outlives obligations when using trait impls] (rust-lang/rust#124336) - [`addr_of(_mut)!` macros and the newly stabilized `&raw (const|mut)` are now safe to use with all static items] (rust-lang/rust#125834) - [size_of_val_raw: for length 0 this is safe to call] (rust-lang/rust#126152) - [Reorder trait bound modifiers *after* `for<...>` binder in trait bounds] (rust-lang/rust#127054) - [Stabilize opaque type precise capturing (RFC 3617)] (rust-lang/rust#127672) - [Stabilize `&raw const` and `&raw mut` operators (RFC 2582)] (rust-lang/rust#127679) - [Stabilize unsafe extern blocks (RFC 3484)] (rust-lang/rust#127921) - [Stabilize nested field access in `offset_of!`] (rust-lang/rust#128284) - [Do not require `T` to be live when dropping `[T; 0]`] (rust-lang/rust#128438) - [Stabilize `const` operands in inline assembly] (rust-lang/rust#128570) - [Stabilize floating-point arithmetic in `const fn`] (rust-lang/rust#128596) - [Stabilize explicit opt-in to unsafe attributes] (rust-lang/rust#128771) - [Document NaN bit patterns guarantees] (rust-lang/rust#129559) Compiler -------- - [Promote riscv64gc-unknown-linux-musl to tier 2] (rust-lang/rust#122049) - [Promote Mac Catalyst targets `aarch64-apple-ios-macabi` and `x86_64-apple-ios-macabi` to Tier 2, and ship them with rustup] (rust-lang/rust#126450) - [Add tier 3 NuttX based targets for RISC-V and ARM] (rust-lang/rust#127755) - [Add tier 3 powerpc-unknown-linux-muslspe target] (rust-lang/rust#127905) - [Improved diagnostics to explain why a pattern is unreachable] (rust-lang/rust#128034) - [The compiler now triggers the unreachable code warning properly for async functions that don't return/are `-> !`] (rust-lang/rust#128443) - [Promote `aarch64-apple-darwin` to Tier 1] (rust-lang/rust#128592) - [Add Trusty OS target `aarch64-unknown-trusty` and `armv7-unknown-trusty` as tier 3 targets] (rust-lang/rust#129490) - [Promote `wasm32-wasip2` to Tier 2.] (rust-lang/rust#126967) Libraries --------- - [Generalize `{Rc,Arc}::make_mut()` to `Path`, `OsStr`, and `CStr`.] (rust-lang/rust#126877) Stabilized APIs --------------- - [`std::thread::Builder::spawn_unchecked`] (https://doc.rust-lang.org/stable/std/thread/struct.Builder.html#method.spawn_unchecked) - [`std::str::CharIndices::offset`] (https://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.offset) - [`std::option::Option::is_none_or`] (https://doc.rust-lang.org/nightly/std/option/enum.Option.html#method.is_none_or) - [`[T]::is_sorted`] (https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.is_sorted) - [`[T]::is_sorted_by`] (https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.is_sorted_by) - [`[T]::is_sorted_by_key`] (https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.is_sorted_by_key) - [`Iterator::is_sorted`] (https://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.is_sorted) - [`Iterator::is_sorted_by`] (https://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.is_sorted_by) - [`Iterator::is_sorted_by_key`] (https://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.is_sorted_by_key) - [`std::future::Ready::into_inner`] (https://doc.rust-lang.org/nightly/std/future/struct.Ready.html#method.into_inner) - [`std::iter::repeat_n`] (https://doc.rust-lang.org/nightly/std/iter/fn.repeat_n.html) - [`impl<T: Clone> DoubleEndedIterator for Take<Repeat<T>>`] (https://doc.rust-lang.org/nightly/std/iter/struct.Take.html#impl-DoubleEndedIterator-for-Take%3CRepeat%3CT%3E%3E) - [`impl<T: Clone> ExactSizeIterator for Take<Repeat<T>>`] (https://doc.rust-lang.org/nightly/std/iter/struct.Take.html#impl-ExactSizeIterator-for-Take%3CRepeat%3CT%3E%3E) - [`impl<T: Clone> ExactSizeIterator for Take<RepeatWith<T>>`] (https://doc.rust-lang.org/nightly/std/iter/struct.Take.html#impl-ExactSizeIterator-for-Take%3CRepeatWith%3CF%3E%3E) - [`impl Default for std::collections::binary_heap::Iter`] (https://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Iter.html#impl-Default-for-Iter%3C'_,+T%3E) - [`impl Default for std::collections::btree_map::RangeMut`] (https://doc.rust-lang.org/nightly/std/collections/btree_map/struct.RangeMut.html#impl-Default-for-RangeMut%3C'_,+K,+V%3E) - [`impl Default for std::collections::btree_map::ValuesMut`] (https://doc.rust-lang.org/nightly/std/collections/btree_map/struct.ValuesMut.html#impl-Default-for-ValuesMut%3C'_,+K,+V%3E) - [`impl Default for std::collections::vec_deque::Iter`] (https://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Iter.html#impl-Default-for-Iter%3C'_,+T%3E) - [`impl Default for std::collections::vec_deque::IterMut`] (https://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.IterMut.html#impl-Default-for-IterMut%3C'_,+T%3E) - [`Rc<T>::new_uninit`] (https://doc.rust-lang.org/nightly/std/rc/struct.Rc.html#method.new_uninit) - [`Rc<T>::assume_init`] (https://doc.rust-lang.org/nightly/std/rc/struct.Rc.html#method.assume_init) - [`Rc<[T]>::new_uninit_slice`] (https://doc.rust-lang.org/nightly/std/rc/struct.Rc.html#method.new_uninit_slice) - [`Rc<[MaybeUninit<T>]>::assume_init`] (https://doc.rust-lang.org/nightly/std/rc/struct.Rc.html#method.assume_init-1) - [`Arc<T>::new_uninit`] (https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.new_uninit) - [`Arc<T>::assume_init`] (https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.assume_init) - [`Arc<[T]>::new_uninit_slice`] (https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.new_uninit_slice) - [`Arc<[MaybeUninit<T>]>::assume_init`] (https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.assume_init-1) - [`Box<T>::new_uninit`] (https://doc.rust-lang.org/nightly/std/boxed/struct.Box.html#method.new_uninit) - [`Box<T>::assume_init`] (https://doc.rust-lang.org/nightly/std/boxed/struct.Box.html#method.assume_init) - [`Box<[T]>::new_uninit_slice`] (https://doc.rust-lang.org/nightly/std/boxed/struct.Box.html#method.new_uninit_slice) - [`Box<[MaybeUninit<T>]>::assume_init`] (https://doc.rust-lang.org/nightly/std/boxed/struct.Box.html#method.assume_init-1) - [`core::arch::x86_64::_bextri_u64`] (https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bextri_u64.html) - [`core::arch::x86_64::_bextri_u32`] (https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bextri_u32.html) - [`core::arch::x86::_mm_broadcastsi128_si256`] (https://doc.rust-lang.org/stable/core/arch/x86/fn._mm_broadcastsi128_si256.html) - [`core::arch::x86::_mm256_stream_load_si256`] (https://doc.rust-lang.org/stable/core/arch/x86/fn._mm256_stream_load_si256.html) - [`core::arch::x86::_tzcnt_u16`] (https://doc.rust-lang.org/stable/core/arch/x86/fn._tzcnt_u16.html) - [`core::arch::x86::_mm_extracti_si64`] (https://doc.rust-lang.org/stable/core/arch/x86/fn._mm_extracti_si64.html) - [`core::arch::x86::_mm_inserti_si64`] (https://doc.rust-lang.org/stable/core/arch/x86/fn._mm_inserti_si64.html) - [`core::arch::x86::_mm_storeu_si16`] (https://doc.rust-lang.org/stable/core/arch/x86/fn._mm_storeu_si16.html) - [`core::arch::x86::_mm_storeu_si32`] (https://doc.rust-lang.org/stable/core/arch/x86/fn._mm_storeu_si32.html) - [`core::arch::x86::_mm_storeu_si64`] (https://doc.rust-lang.org/stable/core/arch/x86/fn._mm_storeu_si64.html) - [`core::arch::x86::_mm_loadu_si16`] (https://doc.rust-lang.org/stable/core/arch/x86/fn._mm_loadu_si16.html) - [`core::arch::x86::_mm_loadu_si32`] (https://doc.rust-lang.org/stable/core/arch/x86/fn._mm_loadu_si32.html) - [`core::arch::wasm32::u8x16_relaxed_swizzle`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u8x16_relaxed_swizzle.html) - [`core::arch::wasm32::i8x16_relaxed_swizzle`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i8x16_relaxed_swizzle.html) - [`core::arch::wasm32::i32x4_relaxed_trunc_f32x4`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i32x4_relaxed_trunc_f32x4.html) - [`core::arch::wasm32::u32x4_relaxed_trunc_f32x4`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u32x4_relaxed_trunc_f32x4.html) - [`core::arch::wasm32::i32x4_relaxed_trunc_f64x2_zero`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i32x4_relaxed_trunc_f64x2_zero.html) - [`core::arch::wasm32::u32x4_relaxed_trunc_f64x2_zero`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u32x4_relaxed_trunc_f64x2_zero.html) - [`core::arch::wasm32::f32x4_relaxed_madd`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f32x4_relaxed_madd.html) - [`core::arch::wasm32::f32x4_relaxed_nmadd`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f32x4_relaxed_nmadd.html) - [`core::arch::wasm32::f64x2_relaxed_madd`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f64x2_relaxed_madd.html) - [`core::arch::wasm32::f64x2_relaxed_nmadd`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f64x2_relaxed_nmadd.html) - [`core::arch::wasm32::i8x16_relaxed_laneselect`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i8x16_relaxed_laneselect.html) - [`core::arch::wasm32::u8x16_relaxed_laneselect`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u8x16_relaxed_laneselect.html) - [`core::arch::wasm32::i16x8_relaxed_laneselect`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i16x8_relaxed_laneselect.html) - [`core::arch::wasm32::u16x8_relaxed_laneselect`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u16x8_relaxed_laneselect.html) - [`core::arch::wasm32::i32x4_relaxed_laneselect`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i32x4_relaxed_laneselect.html) - [`core::arch::wasm32::u32x4_relaxed_laneselect`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u32x4_relaxed_laneselect.html) - [`core::arch::wasm32::i64x2_relaxed_laneselect`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i64x2_relaxed_laneselect.html) - [`core::arch::wasm32::u64x2_relaxed_laneselect`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u64x2_relaxed_laneselect.html) - [`core::arch::wasm32::f32x4_relaxed_min`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f32x4_relaxed_min.html) - [`core::arch::wasm32::f32x4_relaxed_max`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f32x4_relaxed_max.html) - [`core::arch::wasm32::f64x2_relaxed_min`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f64x2_relaxed_min.html) - [`core::arch::wasm32::f64x2_relaxed_max`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.f64x2_relaxed_max.html) - [`core::arch::wasm32::i16x8_relaxed_q15mulr`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i16x8_relaxed_q15mulr.html) - [`core::arch::wasm32::u16x8_relaxed_q15mulr`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u16x8_relaxed_q15mulr.html) - [`core::arch::wasm32::i16x8_relaxed_dot_i8x16_i7x16`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i16x8_relaxed_dot_i8x16_i7x16.html) - [`core::arch::wasm32::u16x8_relaxed_dot_i8x16_i7x16`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u16x8_relaxed_dot_i8x16_i7x16.html) - [`core::arch::wasm32::i32x4_relaxed_dot_i8x16_i7x16_add`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.i32x4_relaxed_dot_i8x16_i7x16_add.html) - [`core::arch::wasm32::u32x4_relaxed_dot_i8x16_i7x16_add`] (https://doc.rust-lang.org/nightly/core/arch/wasm32/fn.u32x4_relaxed_dot_i8x16_i7x16_add.html) These APIs are now stable in const contexts: - [`std::task::Waker::from_raw`] (https://doc.rust-lang.org/nightly/std/task/struct.Waker.html#method.from_raw) - [`std::task::Waker::waker`] (https://doc.rust-lang.org/nightly/std/task/struct.Waker.html#method.from_raw) - [`std::task::Context::from_waker`] (https://doc.rust-lang.org/nightly/std/task/struct.Context.html#method.from_waker) - [`std::task::Context::waker`] (https://doc.rust-lang.org/nightly/std/task/struct.Context.html#method.waker) - [`$integer::from_str_radix`] (https://doc.rust-lang.org/nightly/std/primitive.u32.html#method.from_str_radix) - [`std::num::ParseIntError::kind`] (https://doc.rust-lang.org/nightly/std/num/struct.ParseIntError.html#method.kind) Cargo ----- - [feat: Add `info` cargo subcommand] (rust-lang/cargo#14141) Compatibility Notes ------------------- - We now [disallow setting some built-in cfgs via the command-line](rust-lang/rust#126158) with the newly added [`explicit_builtin_cfgs_in_flags`] (https://doc.rust-lang.org/rustc/lints/listing/deny-by-default.html#explicit-builtin-cfgs-in-flags) lint in order to prevent incoherent state, eg. `windows` cfg active but target is Linux based. The appropriate [`rustc` flag] (https://doc.rust-lang.org/rustc/command-line-arguments.html) should be used instead. - The standard library has a new implementation of `binary_search` which is significantly improves performance ([#128254](rust-lang/rust#128254)). However when a sorted slice has multiple values which compare equal, the new implementation may select a different value among the equal ones than the old implementation. - [illumos/Solaris now sets `MSG_NOSIGNAL` when writing to sockets](rust-lang/rust#128259). This avoids killing the process with SIGPIPE when writing to a closed socket, which matches the existing behavior on other UNIX targets. - [Removes a problematic hack that always passed the --whole-archive linker flag for tests, which may cause linker errors for code accidentally relying on it.] (rust-lang/rust#128400) - The WebAssembly target features `multivalue` and `reference-types` are now both enabled by default. These two features both have subtle changes implied for generated WebAssembly binaries. For the `multivalue` feature, WebAssembly target support has changed when upgrading to LLVM 19. Support for generating functions with multiple returns no longer works and `-Ctarget-feature=+multivalue` has a different meaning than it did in LLVM 18 and prior. There is no longer any supported means to generate a module that has a function with multiple returns in WebAssembly from Rust source code. For the `reference-types` feature the encoding of immediates in the `call_indirect`, a commonly used instruction by the WebAssembly backend, has changed. Validators and parsers which don't understand the `reference-types` proposal will no longer accept modules produced by LLVM due to this change in encoding of immediates. Additionally these features being enabled are encoded in the `target_features` custom section and may affect downstream tooling such as `wasm-opt` consuming the module. Generating a WebAssembly module that disables default features requires `-Zbuild-std` support from Cargo and more information can be found at [rust-lang/rust#128511](rust-lang/rust#128511). - [Rust now raises unsafety errors for union patterns in parameter-position] (rust-lang/rust#130531) 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 19] (rust-lang/rust#127513)

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Where to document allocation size upper bound? rust-lang/unsafe-code-guidelines#465

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[type-layout] Document minimum size and alignment rust-lang/reference#1482

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Rollup of 9 pull requests #128142

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Strengthen soundness proof for size_of_val_raw google/zerocopy#1574

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size_of_val_raw: for length 0 this is safe to call #126152

size_of_val_raw: for length 0 this is safe to call #126152

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size_of_val_raw: for length 0 this is safe to call #126152

size_of_val_raw: for length 0 this is safe to call #126152

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RalfJung commented Jul 10, 2024

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bors commented Jul 24, 2024

RalfJung commented Jun 8, 2024 •

edited

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compiler-errors Jun 8, 2024 •

edited

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