Allow constraining opaque types during various unsizing casts by oli-obk · Pull Request #125610 · rust-lang/rust (original) (raw)

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oli-obk added the T-types

Relevant to the types team, which will review and decide on the PR/issue.

label

May 27, 2024

fmease changed the titleAllow constraining opaqeu types during various unsizing casts Allow constraining opaque types during various unsizing casts

May 27, 2024

traviscross added the A-impl-trait

Area: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.

label

May 28, 2024

bors added S-waiting-on-bors

Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

and removed S-waiting-on-review

Status: Awaiting review from the assignee but also interested parties.

labels

Jun 24, 2024

tmeijn pushed a commit to tmeijn/dotfiles that referenced this pull request

Sep 11, 2024

This MR contains the following updates:

MR created with the help of el-capitano/tools/renovate-bot.

Proposed changes to behavior should be submitted there as MRs.

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wip-sync pushed a commit to NetBSD/pkgsrc-wip that referenced this pull request

Sep 22, 2024

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 1.81.0 (2024-09-05)

Language

• [Abort on uncaught panics in extern "C" functions.] (rust-lang/rust#116088)
• [Fix ambiguous cases of multiple & in elided self lifetimes.] (rust-lang/rust#117967)
• [Stabilize #[expect] for lints (RFC 2383),] (rust-lang/rust#120924) like #[allow] with a warning if the lint is not fulfilled.
• [Change method resolution to constrain hidden types instead of rejecting method candidates.] (rust-lang/rust#123962)
• [Bump elided_lifetimes_in_associated_constant to deny.] (rust-lang/rust#124211)
• [offset_from: always allow pointers to point to the same address.] (rust-lang/rust#124921)
• [Allow constraining opaque types during subtyping in the trait system.] (rust-lang/rust#125447)
• [Allow constraining opaque types during various unsizing casts.] (rust-lang/rust#125610)
• [Deny keyword lifetimes pre-expansion.] (rust-lang/rust#126762)

Compiler

• [Make casts of pointers to trait objects stricter.] (rust-lang/rust#120248)
• [Check alias args for well-formedness even if they have escaping bound vars.] (rust-lang/rust#123737)
• [Deprecate no-op codegen option -Cinline-threshold=....] (rust-lang/rust#124712)
• [Re-implement a type-size based limit.] (rust-lang/rust#125507)
• [Properly account for alignment in transmute size checks.] (rust-lang/rust#125740)
• [Remove the box_pointers lint.] (rust-lang/rust#126018)
• [Ensure the interpreter checks bool/char for validity when they are used in a cast.] (rust-lang/rust#126265)
• [Improve coverage instrumentation for functions containing nested items.] (rust-lang/rust#127199)
• Target changes:
  • [Add Tier 3 no_std Xtensa targets:] (rust-lang/rust#125141) xtensa-esp32-none-elf, xtensa-esp32s2-none-elf, xtensa-esp32s3-none-elf
  • [Add Tier 3 std Xtensa targets:] (rust-lang/rust#126380) xtensa-esp32-espidf, xtensa-esp32s2-espidf, xtensa-esp32s3-espidf
  • [Add Tier 3 i686 Redox OS target:] (rust-lang/rust#126192) i686-unknown-redox
  • [Promote arm64ec-pc-windows-msvc to Tier 2.] (rust-lang/rust#126039)
  • [Promote wasm32-wasip2 to Tier 2.] (rust-lang/rust#126967)
  • [Promote loongarch64-unknown-linux-musl to Tier 2 with host tools.] (rust-lang/rust#126298)
  • [Enable full tools and profiler for LoongArch Linux targets.] (rust-lang/rust#127078)
  • [Unconditionally warn on usage of wasm32-wasi.] (rust-lang/rust#126662) (see compatibility note below)
  • Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support.

Libraries

• [Split core's PanicInfo and std's PanicInfo.] (rust-lang/rust#115974) (see compatibility note below)
• [Generalize {Rc,Arc}::make_mut() to unsized types.] (rust-lang/rust#116113)
• [Replace sort implementations with stable driftsort and unstable ipnsort.] (rust-lang/rust#124032) All slice::sort* and slice::select_nth* methods are expected to see significant performance improvements. See the [research project] (https://github.com/Voultapher/sort-research-rs) for more details.
• [Document behavior of create_dir_all with respect to empty paths.] (rust-lang/rust#125112)
• [Fix interleaved output in the default panic hook when multiple threads panic simultaneously.] (rust-lang/rust#127397)
• Fix Command's batch files argument escaping not working when file name has trailing whitespace or periods (CVE-2024-43402).

Stabilized APIs

• [core::error] (https://doc.rust-lang.org/stable/core/error/index.html)
• [hint::assert_unchecked] (https://doc.rust-lang.org/stable/core/hint/fn.assert_unchecked.html)
• [fs::exists] (https://doc.rust-lang.org/stable/std/fs/fn.exists.html)
• [AtomicBool::fetch_not] (https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicBool.html#method.fetch_not)
• [Duration::abs_diff] (https://doc.rust-lang.org/stable/core/time/struct.Duration.html#method.abs_diff)
• [IoSlice::advance] (https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.advance)
• [IoSlice::advance_slices] (https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.advance_slices)
• [IoSliceMut::advance] (https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.advance)
• [IoSliceMut::advance_slices] (https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.advance_slices)
• [PanicHookInfo] (https://doc.rust-lang.org/stable/std/panic/struct.PanicHookInfo.html)
• [PanicInfo::message] (https://doc.rust-lang.org/stable/core/panic/struct.PanicInfo.html#method.message)
• [PanicMessage] (https://doc.rust-lang.org/stable/core/panic/struct.PanicMessage.html)

These APIs are now stable in const contexts:

• [char::from_u32_unchecked] (https://doc.rust-lang.org/stable/core/char/fn.from_u32_unchecked.html) (function)
• [char::from_u32_unchecked] (https://doc.rust-lang.org/stable/core/primitive.char.html#method.from_u32_unchecked) (method)
• [CStr::count_bytes] (https://doc.rust-lang.org/stable/core/ffi/c_str/struct.CStr.html#method.count_bytes)
• [CStr::from_ptr] (https://doc.rust-lang.org/stable/core/ffi/c_str/struct.CStr.html#method.from_ptr)

Cargo

• [Generated .cargo_vcs_info.json is always included, even when --allow-dirty is passed.] (rust-lang/cargo#13960)
• [Disallow package.license-file and package.readme pointing to non-existent files during packaging.] (rust-lang/cargo#13921)
• [Disallow passing --release/--debug flag along with the --profile flag.] (rust-lang/cargo#13971)
• [Remove lib.plugin key support in Cargo.toml. Rust plugin support has been deprecated for four years and was removed in 1.75.0.] (rust-lang/cargo#13902)

Compatibility Notes

• Usage of the wasm32-wasi target will now issue a compiler warning and request users switch to the wasm32-wasip1 target instead. Both targets are the same, wasm32-wasi is only being renamed, and this [change to the WASI target] (https://blog.rust-lang.org/2024/04/09/updates-to-rusts-wasi-targets.html) is being done to enable removing wasm32-wasi in January 2025.

• We have renamed std::panic::PanicInfo to std::panic::PanicHookInfo. The old name will continue to work as an alias, but will result in a deprecation warning starting in Rust 1.82.0.

  core::panic::PanicInfo will remain unchanged, however, as this is now a different type.

  The reason is that these types have different roles: std::panic::PanicHookInfo is the argument to the panic hook in std context (where panics can have an arbitrary payload), while core::panic::PanicInfo is the argument to the #[panic_handler] in no_std context (where panics always carry a formatted message). Separating these types allows us to add more useful methods to these types, such as std::panic::PanicHookInfo::payload_as_str() and core::panic::PanicInfo::message().

• The new sort implementations may panic if a type's implementation of Ord (or the given comparison function) does not implement a total order as the trait requires. Ord's supertraits (PartialOrd, Eq, and PartialEq) must also be consistent. The previous implementations would not "notice" any problem, but the new implementations have a good chance of detecting inconsistencies, throwing a panic rather than returning knowingly unsorted data.

• [In very rare cases, a change in the internal evaluation order of the trait solver may result in new fatal overflow errors.] (rust-lang/rust#126128)

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.

• [Add a Rust-for Linux auto CI job to check kernel builds.] (rust-lang/rust#125209)

netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request

Nov 24, 2024

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 1.81.0 (2024-09-05)

Language

• [Abort on uncaught panics in extern "C" functions.] (rust-lang/rust#116088)
• [Fix ambiguous cases of multiple & in elided self lifetimes.] (rust-lang/rust#117967)
• [Stabilize #[expect] for lints (RFC 2383),] (rust-lang/rust#120924) like #[allow] with a warning if the lint is not fulfilled.
• [Change method resolution to constrain hidden types instead of rejecting method candidates.] (rust-lang/rust#123962)
• [Bump elided_lifetimes_in_associated_constant to deny.] (rust-lang/rust#124211)
• [offset_from: always allow pointers to point to the same address.] (rust-lang/rust#124921)
• [Allow constraining opaque types during subtyping in the trait system.] (rust-lang/rust#125447)
• [Allow constraining opaque types during various unsizing casts.] (rust-lang/rust#125610)
• [Deny keyword lifetimes pre-expansion.] (rust-lang/rust#126762)

Compiler

• [Make casts of pointers to trait objects stricter.] (rust-lang/rust#120248)
• [Check alias args for well-formedness even if they have escaping bound vars.] (rust-lang/rust#123737)
• [Deprecate no-op codegen option -Cinline-threshold=....] (rust-lang/rust#124712)
• [Re-implement a type-size based limit.] (rust-lang/rust#125507)
• [Properly account for alignment in transmute size checks.] (rust-lang/rust#125740)
• [Remove the box_pointers lint.] (rust-lang/rust#126018)
• [Ensure the interpreter checks bool/char for validity when they are used in a cast.] (rust-lang/rust#126265)
• [Improve coverage instrumentation for functions containing nested items.] (rust-lang/rust#127199)
• Target changes:
  • [Add Tier 3 no_std Xtensa targets:] (rust-lang/rust#125141) xtensa-esp32-none-elf, xtensa-esp32s2-none-elf, xtensa-esp32s3-none-elf
  • [Add Tier 3 std Xtensa targets:] (rust-lang/rust#126380) xtensa-esp32-espidf, xtensa-esp32s2-espidf, xtensa-esp32s3-espidf
  • [Add Tier 3 i686 Redox OS target:] (rust-lang/rust#126192) i686-unknown-redox
  • [Promote arm64ec-pc-windows-msvc to Tier 2.] (rust-lang/rust#126039)
  • [Promote wasm32-wasip2 to Tier 2.] (rust-lang/rust#126967)
  • [Promote loongarch64-unknown-linux-musl to Tier 2 with host tools.] (rust-lang/rust#126298)
  • [Enable full tools and profiler for LoongArch Linux targets.] (rust-lang/rust#127078)
  • [Unconditionally warn on usage of wasm32-wasi.] (rust-lang/rust#126662) (see compatibility note below)
  • Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support.

Libraries

• [Split core's PanicInfo and std's PanicInfo.] (rust-lang/rust#115974) (see compatibility note below)
• [Generalize {Rc,Arc}::make_mut() to unsized types.] (rust-lang/rust#116113)
• [Replace sort implementations with stable driftsort and unstable ipnsort.] (rust-lang/rust#124032) All slice::sort* and slice::select_nth* methods are expected to see significant performance improvements. See the [research project] (https://github.com/Voultapher/sort-research-rs) for more details.
• [Document behavior of create_dir_all with respect to empty paths.] (rust-lang/rust#125112)
• [Fix interleaved output in the default panic hook when multiple threads panic simultaneously.] (rust-lang/rust#127397)
• Fix Command's batch files argument escaping not working when file name has trailing whitespace or periods (CVE-2024-43402).

Stabilized APIs

• [core::error] (https://doc.rust-lang.org/stable/core/error/index.html)
• [hint::assert_unchecked] (https://doc.rust-lang.org/stable/core/hint/fn.assert_unchecked.html)
• [fs::exists] (https://doc.rust-lang.org/stable/std/fs/fn.exists.html)
• [AtomicBool::fetch_not] (https://doc.rust-lang.org/stable/core/sync/atomic/struct.AtomicBool.html#method.fetch_not)
• [Duration::abs_diff] (https://doc.rust-lang.org/stable/core/time/struct.Duration.html#method.abs_diff)
• [IoSlice::advance] (https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.advance)
• [IoSlice::advance_slices] (https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.advance_slices)
• [IoSliceMut::advance] (https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.advance)
• [IoSliceMut::advance_slices] (https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.advance_slices)
• [PanicHookInfo] (https://doc.rust-lang.org/stable/std/panic/struct.PanicHookInfo.html)
• [PanicInfo::message] (https://doc.rust-lang.org/stable/core/panic/struct.PanicInfo.html#method.message)
• [PanicMessage] (https://doc.rust-lang.org/stable/core/panic/struct.PanicMessage.html)

These APIs are now stable in const contexts:

• [char::from_u32_unchecked] (https://doc.rust-lang.org/stable/core/char/fn.from_u32_unchecked.html) (function)
• [char::from_u32_unchecked] (https://doc.rust-lang.org/stable/core/primitive.char.html#method.from_u32_unchecked) (method)
• [CStr::count_bytes] (https://doc.rust-lang.org/stable/core/ffi/c_str/struct.CStr.html#method.count_bytes)
• [CStr::from_ptr] (https://doc.rust-lang.org/stable/core/ffi/c_str/struct.CStr.html#method.from_ptr)

Cargo

• [Generated .cargo_vcs_info.json is always included, even when --allow-dirty is passed.] (rust-lang/cargo#13960)
• [Disallow package.license-file and package.readme pointing to non-existent files during packaging.] (rust-lang/cargo#13921)
• [Disallow passing --release/--debug flag along with the --profile flag.] (rust-lang/cargo#13971)
• [Remove lib.plugin key support in Cargo.toml. Rust plugin support has been deprecated for four years and was removed in 1.75.0.] (rust-lang/cargo#13902)

Compatibility Notes

• Usage of the wasm32-wasi target will now issue a compiler warning and request users switch to the wasm32-wasip1 target instead. Both targets are the same, wasm32-wasi is only being renamed, and this [change to the WASI target] (https://blog.rust-lang.org/2024/04/09/updates-to-rusts-wasi-targets.html) is being done to enable removing wasm32-wasi in January 2025.

• We have renamed std::panic::PanicInfo to std::panic::PanicHookInfo. The old name will continue to work as an alias, but will result in a deprecation warning starting in Rust 1.82.0.

  core::panic::PanicInfo will remain unchanged, however, as this is now a different type.

  The reason is that these types have different roles: std::panic::PanicHookInfo is the argument to the panic hook in std context (where panics can have an arbitrary payload), while core::panic::PanicInfo is the argument to the #[panic_handler] in no_std context (where panics always carry a formatted message). Separating these types allows us to add more useful methods to these types, such as std::panic::PanicHookInfo::payload_as_str() and core::panic::PanicInfo::message().

• The new sort implementations may panic if a type's implementation of Ord (or the given comparison function) does not implement a total order as the trait requires. Ord's supertraits (PartialOrd, Eq, and PartialEq) must also be consistent. The previous implementations would not "notice" any problem, but the new implementations have a good chance of detecting inconsistencies, throwing a panic rather than returning knowingly unsorted data.

• [In very rare cases, a change in the internal evaluation order of the trait solver may result in new fatal overflow errors.] (rust-lang/rust#126128)

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.

• [Add a Rust-for Linux auto CI job to check kernel builds.] (rust-lang/rust#125209)