Stabilize Vec<T>::shrink_to #86879

YohDeadfall · 2021-07-05T11:45:42Z

This PR stabilizes shrink_to feature and closes the corresponding issue. The second point was addressed already, and no panic! should occur.

Closes #56431.

rust-highfive · 2021-07-05T11:45:45Z

r? @yaahc

(rust-highfive has picked a reviewer for you, use r? to override)

YohDeadfall · 2021-07-05T11:46:25Z

@rustbot modify labels: +T-libs

bors · 2021-07-05T22:20:19Z

☔ The latest upstream changes (presumably #86891) made this pull request unmergeable. Please resolve the merge conflicts.

yaahc · 2021-07-06T23:14:04Z

@rfcbot merge

cuviper · 2021-07-07T16:24:28Z

Perhaps I misunderstand roles, but shouldn't this be a T-libs-api decision?

yaahc · 2021-07-28T22:12:09Z

Perhaps I misunderstand roles, but shouldn't this be a T-libs-api decision?

yea, I didn't notice it was on the wrong tag

yaahc · 2021-07-28T22:12:46Z

@rfcbot cancel

rfcbot · 2021-07-28T22:12:46Z

@yaahc proposal cancelled.

yaahc · 2021-07-28T22:13:14Z

@rfcbot merge

rfcbot · 2021-07-28T22:13:15Z

Team member @yaahc 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!

See this document for info about what commands tagged team members can give me.

dtolnay · 2021-07-28T22:16:35Z

What is an example of real world code that needs this?

YohDeadfall · 2021-07-29T08:24:09Z

yea, I didn't notice it was on the wrong tag

What's a difference between tags T-libs-api and T-libs?

What is an example of real world code that needs this?

There's a method to reduce capacity as close as possible to the vector's size, but in come cases there should be a room for future insertions. For example, after a memory usage spike a vector should be shrunk, but at the same time any next insertion should not cause a new allocation if it's not a peak load again.

A real case of usage is in Bevy where some components store a vector of some data and this vector is populated and cleared on every visibility change to determine which elements are really visible and should be rendered. Currently there's a comment to implement shrinking to a meaningful size when the vector's capacity grows to much and not used for a while.

rfcbot · 2021-07-29T18:28:37Z

🔔 This is now entering its final comment period, as per the review above. 🔔

m-ou-se · 2021-08-04T18:58:27Z

What's a difference between tags T-libs-api and T-libs?

The T-libs is responsible for maintainance and development of the libraries, but T-libs-api is responsible for the (stable) public api and thus handles RFCs and stabilizations etc.

rfcbot · 2021-08-08T18:30:07Z

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.

The RFC will be merged soon.

dtolnay · 2021-08-08T18:37:56Z

@bors r+

bors · 2021-08-08T18:37:58Z

📌 Commit 8ec5060 has been approved by dtolnay

bors · 2021-08-08T19:37:05Z

⌛ Testing commit 8ec5060 with merge ad981d5...

bors · 2021-08-08T22:17:39Z

☀️ Test successful - checks-actions
Approved by: dtolnay
Pushing ad981d5 to master...

Pkgsrc changes: * Remove one now-longer-applicable patch, adjust a few others * Bump bootstrap requirements to 1.55.0. Upstream changes: Version 1.56.0 (2021-10-21) ======================== Language -------- - [The 2021 Edition is now stable.][rust#88100] See [the edition guide][rust-2021-edition-guide] for more details. - [The pattern in `binding @ pattern` can now also introduce new bindings.] [rust#85305] - [Union field access is permitted in `const fn`.][rust#85769] [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html Compiler -------- - [Upgrade to LLVM 13.][rust#87570] - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023] - [Allow specifying a deployment target version for all iOS targets][rust#87699] - [Warnings can be forced on with `--force-warn`.][rust#87472] This feature is primarily intended for usage by `cargo fix`, rather than end users. - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760] - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370] - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.] [rust#83342] The Windows console still requires valid Unicode, but this change allows splitting a UTF-8 character across multiple write calls. This allows, for instance, programs that just read and write data buffers (e.g. copying a file to stdout) without regard for Unicode or character boundaries. - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.] [rust#83093] For this use case, atomics scale much better under contention. - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835] - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744] - [`impl From<[(K, V); N]>` for all collections.][rust#84111] - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363] - [Treat invalid environment variable names as non-existent.][rust#86183] Previously, the environment functions would panic if given a variable name with an internal null character or equal sign (`=`). Now, these functions will just treat such names as non-existent variables, since the OS cannot represent the existence of a variable with such a name. Stabilised APIs --------------- - [`std::os::unix::fs::chroot`] - [`UnsafeCell::raw_get`] - [`BufWriter::into_parts`] - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`] These APIs were previously stable in `std`, but are now also available in `core`. - [`Vec::shrink_to`] - [`String::shrink_to`] - [`OsString::shrink_to`] - [`PathBuf::shrink_to`] - [`BinaryHeap::shrink_to`] - [`VecDeque::shrink_to`] - [`HashMap::shrink_to`] - [`HashSet::shrink_to`] These APIs are now usable in const contexts: - [`std::mem::transmute`] - [`[T]::first`][`slice::first`] - [`[T]::split_first`][`slice::split_first`] - [`[T]::last`][`slice::last`] - [`[T]::split_last`][`slice::split_last`] Cargo ----- - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.] [`rust-version`] This has no effect at present on dependency version selection. We encourage crates to specify their minimum supported Rust version, and we encourage CI systems that support Rust code to include a crate's specified minimum version in the text matrix for that crate by default. Compatibility notes ------------------- - [Update to new argument parsing rules on Windows.][rust#87580] This adjusts Rust's standard library to match the behavior of the standard libraries for C/C++. The rules have changed slightly over time, and this PR brings us to the latest set of rules (changed in 2008). - [Disallow the aapcs calling convention on aarch64][rust#88399] This was already not supported by LLVM; this change surfaces this lack of support with a better error message. - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385] - [Warn when an escaped newline skips multiple lines.][rust#87671] - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec` may return different values on glibc <= 2.24.][rust#81825] Rust now invokes the `clone3` system call directly, when available, to use new functionality available via that system call. Older versions of glibc cache the result of `getpid`, and only update that cache when calling glibc's clone/fork functions, so a direct system call bypasses that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason. Internal changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069] This improves the performance of most Rust builds. - [Unify representation of macros in internal data structures.][rust#88019] This change fixes a host of bugs with the handling of macros by the compiler, as well as rustdoc. [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html [`Iterator::intersperse`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse [`Iterator::intersperse_with`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: rust-lang/rust#84662 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last [`slice::split_last`]: https:https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field [rust#87671]: rust-lang/rust#87671 [rust#86183]: rust-lang/rust#86183 [rust#87385]: rust-lang/rust#87385 [rust#88100]: rust-lang/rust#88100 [rust#86860]: rust-lang/rust#86860 [rust#84039]: rust-lang/rust#84039 [rust#86492]: rust-lang/rust#86492 [rust#88363]: rust-lang/rust#88363 [rust#85305]: rust-lang/rust#85305 [rust#87832]: rust-lang/rust#87832 [rust#88069]: rust-lang/rust#88069 [rust#87472]: rust-lang/rust#87472 [rust#87699]: rust-lang/rust#87699 [rust#87570]: rust-lang/rust#87570 [rust#88023]: rust-lang/rust#88023 [rust#87760]: rust-lang/rust#87760 [rust#87370]: rust-lang/rust#87370 [rust#87580]: rust-lang/rust#87580 [rust#83342]: rust-lang/rust#83342 [rust#83093]: rust-lang/rust#83093 [rust#88177]: rust-lang/rust#88177 [rust#88548]: rust-lang/rust#88548 [rust#88551]: rust-lang/rust#88551 [rust#88299]: rust-lang/rust#88299 [rust#88220]: rust-lang/rust#88220 [rust#85835]: rust-lang/rust#85835 [rust#86879]: rust-lang/rust#86879 [rust#86744]: rust-lang/rust#86744 [rust#84662]: rust-lang/rust#84662 [rust#86593]: rust-lang/rust#86593 [rust#81050]: rust-lang/rust#81050 [rust#81363]: rust-lang/rust#81363 [rust#84111]: rust-lang/rust#84111 [rust#85769]: rust-lang/rust#85769 (comment) [rust#88490]: rust-lang/rust#88490 [rust#88269]: rust-lang/rust#88269 [rust#84176]: rust-lang/rust#84176 [rust#88399]: rust-lang/rust#88399 [rust#88227]: rust-lang/rust#88227 [rust#88200]: rust-lang/rust#88200 [rust#82776]: rust-lang/rust#82776 [rust#88077]: rust-lang/rust#88077 [rust#87728]: rust-lang/rust#87728 [rust#87050]: rust-lang/rust#87050 [rust#87619]: rust-lang/rust#87619 [rust#81825]: rust-lang/rust#81825 (comment) [rust#88019]: rust-lang/rust#88019 [rust#87666]: rust-lang/rust#87666

Pkgsrc changes: * Bump bootstrap kit version to 1.55.0. * Adjust patches as needed, some no longer apply (so removed) * Update checksum adjustments. * Avoid rust-llvm on SunOS * Optionally build docs * Remove reference to closed/old PR#54621 Upstream changes: Version 1.56.1 (2021-11-01) =========================== - New lints to detect the presence of bidirectional-override Unicode codepoints in the compiled source code ([CVE-2021-42574]) [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574 Version 1.56.0 (2021-10-21) ======================== Language -------- - [The 2021 Edition is now stable.][rust#88100] See [the edition guide][rust-2021-edition-guide] for more details. - [The pattern in `binding @ pattern` can now also introduce new bindings.] [rust#85305] - [Union field access is permitted in `const fn`.][rust#85769] [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html Compiler -------- - [Upgrade to LLVM 13.][rust#87570] - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.] [rust#88023] - [Allow specifying a deployment target version for all iOS targets][rust#87699] - [Warnings can be forced on with `--force-warn`.][rust#87472] This feature is primarily intended for usage by `cargo fix`, rather than end users. - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760] - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370] - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.] [rust#83342] The Windows console still requires valid Unicode, but this change allows splitting a UTF-8 character across multiple write calls. This allows, for instance, programs that just read and write data buffers (e.g. copying a file to stdout) without regard for Unicode or character boundaries. - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.] [rust#83093] For this use case, atomics scale much better under contention. - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835] - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744] - [`impl From<[(K, V); N]>` for all collections.][rust#84111] - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363] - [Treat invalid environment variable names as non-existent.][rust#86183] Previously, the environment functions would panic if given a variable name with an internal null character or equal sign (`=`). Now, these functions will just treat such names as non-existent variables, since the OS cannot represent the existence of a variable with such a name. Stabilised APIs --------------- - [`std::os::unix::fs::chroot`] - [`UnsafeCell::raw_get`] - [`BufWriter::into_parts`] - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`] These APIs were previously stable in `std`, but are now also available in `core`. - [`Vec::shrink_to`] - [`String::shrink_to`] - [`OsString::shrink_to`] - [`PathBuf::shrink_to`] - [`BinaryHeap::shrink_to`] - [`VecDeque::shrink_to`] - [`HashMap::shrink_to`] - [`HashSet::shrink_to`] These APIs are now usable in const contexts: - [`std::mem::transmute`] - [`[T]::first`][`slice::first`] - [`[T]::split_first`][`slice::split_first`] - [`[T]::last`][`slice::last`] - [`[T]::split_last`][`slice::split_last`] Cargo ----- - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.] [`rust-version`] This has no effect at present on dependency version selection. We encourage crates to specify their minimum supported Rust version, and we encourage CI systems that support Rust code to include a crate's specified minimum version in the text matrix for that crate by default. Compatibility notes ------------------- - [Update to new argument parsing rules on Windows.][rust#87580] This adjusts Rust's standard library to match the behavior of the standard libraries for C/C++. The rules have changed slightly over time, and this PR brings us to the latest set of rules (changed in 2008). - [Disallow the aapcs calling convention on aarch64][rust#88399] This was already not supported by LLVM; this change surfaces this lack of support with a better error message. - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385] - [Warn when an escaped newline skips multiple lines.][rust#87671] - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec` may return different values on glibc <= 2.24.][rust#81825] Rust now invokes the `clone3` system call directly, when available, to use new functionality available via that system call. Older versions of glibc cache the result of `getpid`, and only update that cache when calling glibc's clone/fork functions, so a direct system call bypasses that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason. Internal changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.] [rust#88069] This improves the performance of most Rust builds. - [Unify representation of macros in internal data structures.][rust#88019] This change fixes a host of bugs with the handling of macros by the compiler, as well as rustdoc. [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html [`Iterator::intersperse`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse [`Iterator::intersperse_with`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: rust-lang/rust#84662 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field [rust#87671]: rust-lang/rust#87671 [rust#86183]: rust-lang/rust#86183 [rust#87385]: rust-lang/rust#87385 [rust#88100]: rust-lang/rust#88100 [rust#86860]: rust-lang/rust#86860 [rust#84039]: rust-lang/rust#84039 [rust#86492]: rust-lang/rust#86492 [rust#88363]: rust-lang/rust#88363 [rust#85305]: rust-lang/rust#85305 [rust#87832]: rust-lang/rust#87832 [rust#88069]: rust-lang/rust#88069 [rust#87472]: rust-lang/rust#87472 [rust#87699]: rust-lang/rust#87699 [rust#87570]: rust-lang/rust#87570 [rust#88023]: rust-lang/rust#88023 [rust#87760]: rust-lang/rust#87760 [rust#87370]: rust-lang/rust#87370 [rust#87580]: rust-lang/rust#87580 [rust#83342]: rust-lang/rust#83342 [rust#83093]: rust-lang/rust#83093 [rust#88177]: rust-lang/rust#88177 [rust#88548]: rust-lang/rust#88548 [rust#88551]: rust-lang/rust#88551 [rust#88299]: rust-lang/rust#88299 [rust#88220]: rust-lang/rust#88220 [rust#85835]: rust-lang/rust#85835 [rust#86879]: rust-lang/rust#86879 [rust#86744]: rust-lang/rust#86744 [rust#84662]: rust-lang/rust#84662 [rust#86593]: rust-lang/rust#86593 [rust#81050]: rust-lang/rust#81050 [rust#81363]: rust-lang/rust#81363 [rust#84111]: rust-lang/rust#84111 [rust#85769]: rust-lang/rust#85769 (comment) [rust#88490]: rust-lang/rust#88490 [rust#88269]: rust-lang/rust#88269 [rust#84176]: rust-lang/rust#84176 [rust#88399]: rust-lang/rust#88399 [rust#88227]: rust-lang/rust#88227 [rust#88200]: rust-lang/rust#88200 [rust#82776]: rust-lang/rust#82776 [rust#88077]: rust-lang/rust#88077 [rust#87728]: rust-lang/rust#87728 [rust#87050]: rust-lang/rust#87050 [rust#87619]: rust-lang/rust#87619 [rust#81825]: rust-lang/rust#81825 (comment) [rust#88019]: rust-lang/rust#88019 [rust#87666]: rust-lang/rust#87666 Version 1.55.0 (2021-09-09) ============================ Language -------- - [You can now write open "from" range patterns (`X..`), which will start at `X` and will end at the maximum value of the integer.][83918] - [You can now explicitly import the prelude of different editions through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294] Compiler -------- - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761] These improvements should in general provide faster string parsing of floats, no longer reject certain valid floating point values, and reduce the produced code size for non-stripped artifacts. - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858] Stabilised APIs --------------- - [`Bound::cloned`] - [`Drain::as_str`] - [`IntoInnerError::into_error`] - [`IntoInnerError::into_parts`] - [`MaybeUninit::assume_init_mut`] - [`MaybeUninit::assume_init_ref`] - [`MaybeUninit::write`] - [`array::map`] - [`ops::ControlFlow`] - [`x86::_bittest`] - [`x86::_bittestandcomplement`] - [`x86::_bittestandreset`] - [`x86::_bittestandset`] - [`x86_64::_bittest64`] - [`x86_64::_bittestandcomplement64`] - [`x86_64::_bittestandreset64`] - [`x86_64::_bittestandset64`] The following previously stable functions are now `const`. - [`str::from_utf8_unchecked`] Cargo ----- - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking rustc in parallel such as when using `cargo test`.][cargo/9675] - [The package definition in `cargo metadata` now includes the `"default_run"` field from the manifest.][cargo/9550] - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680] - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"` of packages.][cargo/9663] Rustdoc ------- - [Added "Go to item on exact match" search option.][85876] - [The "Implementors" section on traits no longer shows redundant method definitions.][85970] - [Trait implementations are toggled open by default.][86260] This should make the implementations more searchable by tools like `CTRL+F` in your browser. - [Intra-doc links should now correctly resolve associated items (e.g. methods) through type aliases.][86334] - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the "Trait Implementations" section.][86513] Compatibility Notes ------------------- - [std functions that return an `io::Error` will no longer use the `ErrorKind::Other` variant.][85746] This is to better reflect that these kinds of errors could be categorised [into newer more specific `ErrorKind` variants][79965], and that they do not represent a user error. - [Using environment variable names with `process::Command` on Windows now behaves as expected.][85270] Previously using envionment variables with `Command` would cause them to be ASCII-uppercased. - [Rustdoc will now warn on using rustdoc lints that aren't prefixed with `rustdoc::`][86849] [86849]: rust-lang/rust#86849 [86513]: rust-lang/rust#86513 [86334]: rust-lang/rust#86334 [86260]: rust-lang/rust#86260 [85970]: rust-lang/rust#85970 [85876]: rust-lang/rust#85876 [83572]: rust-lang/rust#83572 [86294]: rust-lang/rust#86294 [86858]: rust-lang/rust#86858 [86761]: rust-lang/rust#86761 [85769]: rust-lang/rust#85769 [85746]: rust-lang/rust#85746 [85305]: rust-lang/rust#85305 [85270]: rust-lang/rust#85270 [84111]: rust-lang/rust#84111 [83918]: rust-lang/rust#83918 [79965]: rust-lang/rust#79965 [87370]: rust-lang/rust#87370 [87298]: rust-lang/rust#87298 [cargo/9663]: rust-lang/cargo#9663 [cargo/9675]: rust-lang/cargo#9675 [cargo/9550]: rust-lang/cargo#9550 [cargo/9680]: rust-lang/cargo#9680 [cargo/9663]: rust-lang/cargo#9663 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write [`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html

See rust-lang/rust#86879.

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Stabilize Vec<T>::shrink_to

4867a21

YohDeadfall force-pushed the stabilize-vec-shrink-to branch from a49cffc to 4867a21 Compare July 6, 2021 07:38

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YohDeadfall mentioned this pull request Aug 5, 2021

Fixed team responsible for stabilization rust-lang/rustc-dev-guide#1181

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Bump shrink_to stabilization to Rust 1.56

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dtolnay approved these changes Aug 8, 2021

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Add shrink_to() method, stabilized in Rust 1.56.0

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See rust-lang/rust#86879.

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Stabilize Vec<T>::shrink_to #86879

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Stabilize Vec<T>::shrink_to #86879

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