Repository navigation
Draft release notes for 1.87 #140133
Description
NOTE: We are trying this issue as a new way to work on the draft release notes.
Use the 📝 links to edit those that have a relnotes-tracking-issue,
and they will be updated when we regenerate the notes periodically.
cc @rust-lang/release
Version 1.87.0 (2025-05-15)
Language
- Stabilize
asm_gotofeature
📝 - Allow parsing open beginning ranges after unary operators
📝 - Don't require method impls for methods with
Self: Sizedbounds inimpls for unsized types
📝 - Stabilize
feature(precise_capturing_in_traits)allowinguse<...>bounds on return positionimpl Traitintraits
📝
Compiler
Platform Support
Refer to Rust's platform support page
for more information on Rust's tiered platform support.
Libraries
- Stabilize the anonymous pipe API
📝 - Add support for unbounded left/right shift operations
📝 - Print pointer metadata in
Debugimpl of raw pointers
📝 Vec::with_capacityguarantees it allocates with the amount requested, even ifVec::capacityreturns a different number.
📝- Most
std::archintrinsics which don't take pointer arguments can now be called from safe code if the caller has the appropriate target features already enabled (mark x86 intrinsics as safe stdarch#1714, mark arm intrinsics as safe stdarch#1716, mark riscv intrinsics as safe stdarch#1717)
📝 - Undeprecate
env::home_dir
📝 - Denote
ControlFlowas#[must_use]
📝 - Macros such as
assert_eq!andvec!now supportconst {...}expressions
📝
Stabilized APIs
Vec::extract_ifvec::ExtractIfLinkedList::extract_iflinked_list::ExtractIf
📝<[T]>::split_off<[T]>::split_off_mut<[T]>::split_off_first<[T]>::split_off_first_mut<[T]>::split_off_last<[T]>::split_off_last_mut
📝String::extend_from_within
📝os_str::DisplayOsString::displayOsStr::display
📝io::pipeio::PipeReaderio::PipeWriterimpl From<PipeReader> for OwnedHandleimpl From<PipeWriter> for OwnedHandleimpl From<PipeReader> for Stdioimpl From<PipeWriter> for Stdioimpl From<PipeReader> for OwnedFdimpl From<PipeWriter> for OwnedFd
📝Box<MaybeUninit<T>>::write
📝impl TryFrom<Vec<u8>> for String
📝
These APIs are now stable in const contexts:
<*const T>::offset_from_unsigned<*const T>::byte_offset_from_unsigned<*mut T>::offset_from_unsigned<*mut T>::byte_offset_from_unsignedNonNull::offset_from_unsignedNonNull::byte_offset_from_unsigned
📝<uN>::cast_signedNonZero::<uN>::cast_signed.<iN>::cast_signed.NonZero::<iN>::cast_unsigned.
📝<uN>::is_multiple_of
📝<uN>::unbounded_shl<uN>::unbounded_shr<iN>::unbounded_shl<iN>::unbounded_shr
📝<str>::from_utf8<str>::from_utf8_mut<str>::from_utf8_unchecked<str>::from_utf8_unchecked_mut
📝<[T]>::copy_from_slice
📝SocketAddr::set_ipSocketAddr::set_port,SocketAddrV4::set_ipSocketAddrV4::set_port,SocketAddrV6::set_ipSocketAddrV6::set_portSocketAddrV6::set_flowinfoSocketAddrV6::set_scope_id
📝char::is_digitchar::is_whitespace
📝<iN>:midpoint
📝<[[T; N]]>::as_flattened<[[T; N]]>::as_flattened_mut
📝<str>::from_utf8_mutcore::str::from_utf8_mut
📝String::into_bytesString::as_strString::capacityString::as_bytesString::lenString::is_emptyString::as_mut_strString::as_mut_vecVec::as_ptrVec::as_sliceVec::capacityVec::lenVec::is_emptyVec::as_mut_sliceVec::as_mut_ptr
📝
Cargo
- Add terminal integration via ANSI OSC 9;4 sequences
- chore: bump openssl to v3
- feat(package): add --exclude-lockfile flag
Rustdoc
Compatibility Notes
- Rust now raises an error for macro invocations inside the
#![crate_name]attribute
📝 - Unstable fields are now always considered to be inhabited
📝 - Macros ??? may ?? break now ??? due to ranges and unary operators ??? idk ?
📝 - Make
Debugimpl of raw pointers print metadata if present
📝 - Warn against function pointers using unsupported ABI strings in dependencies
📝 - Associated types on
dyntypes are no longer deduplicated
📝 - Forbid attributes on
..inside of struct patterns (let Struct { #[attribute] .. }) =
📝 - Make
ptr_cast_add_auto_to_objectlint into hard error
📝 - Many
std::archintrinsics are now safe to call in some contexts, there may now be newunused_unsafewarnings in existing codebases.
📝 - Limit
widthandprecisionformatting options to 16 bits on all targets
📝 - Turn order dependent trait objects future incompat warning into a hard error
📝 - Denote
ControlFlowas#[must_use]
📝 - Remove i586-pc-windows-msvc target
📝 - Windows: The standard library no longer links advapi32, except on win7. Code such as C libraries that were relying on this assumption may need to explicitly link advapi32.
📝 - Remove
NonterminalandTokenKind::Interpolated
📝 - expand: Leave traces when expanding
cfgattributes
📝
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.
Other
Reacted by ifsheldon, Adam Baxter, Alexander and Eyal Kalderon
Reacted by ifsheldon, Adam Baxter, Alexander, Eyal Kalderon and Yiyu Lin
Activity
BoxyUwU commentedon Apr 21, 2025
@rustbot ping relnotes-interest-group
rustbot commentedon Apr 21, 2025
Hi relnotes-interest-group, this issue/PR could use some help in reviewing /
adjusting release notes. Could you take a look if available? Thanks <3
cc @alex-semenyuk @jieyouxu @joshtriplett @Kobzol @lcnr @traviscross
miestrode commentedon Apr 29, 2025
jieyouxu commentedon Apr 29, 2025
pthariensflame commentedon May 8, 2025
BoxyUwU commentedon May 8, 2025
release notes have now been moved to a PR #140802
thanks everyone for all the help and reviews :)
Rollup merge of rust-lang#140802 - BoxyUwU:relnotes_1_87_0, r=pietroa…
Rollup merge of rust-lang#140802 - BoxyUwU:relnotes_1_87_0, r=pietroa…
Unrolled build for rust-lang#140802