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go/doc/go1.21.html
Michael Anthony Knyszek 97f56645e2 doc: add release note for runtime/metrics additions 
For #56857.

Change-Id: I03bdba906d271d97ce29874c50d5aba55dc285b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/498075
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
2023-05-24 21:47:00 +00:00

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<!--{
"Title": "Go 1.21 Release Notes",
"Path": "/doc/go1.21"
}-->
<!--
NOTE: In this document and others in this directory, the convention is to
set fixed-width phrases with non-fixed-width spaces, as in
<code>hello</code> <code>world</code>.
Do not send CLs removing the interior tags from such phrases.
-->
<style>
main ul li { margin: 0.5em 0; }
</style>
<h2 id="introduction">DRAFT RELEASE NOTES — Introduction to Go 1.21</h2>
<p>
<strong>
Go 1.21 is not yet released. These are work-in-progress
release notes. Go 1.21 is expected to be released in August 2023.
</strong>
</p>
<h2 id="language">Changes to the language</h2>
<p><!-- https://go.dev/issue/56986 -->
TODO: <a href="https://go.dev/issue/56986">https://go.dev/issue/56986</a>: extended backwards compatibility for Go
</p>
<!-- https://go.dev/issue/57969 -->
<p>
<!-- add GOEXPERIMENT=loopvar -->
</p>
<p>
TODO: complete this section
</p>
<h2 id="ports">Ports</h2>
<!-- CL 470695 -->
<p>
<!-- cmd/dist: default to GOARM=7 on all non-arm systems -->
</p>
<!-- https://go.dev/issue/38248 -->
<p>
<!-- replace CallImport with go:wasmimport directive -->
</p>
<h3 id="wasip1">WebAssembly</h3>
<!-- https://go.dev/issue/59149 -->
<p>
<!-- allow the use of go:wasmimport globally -->
</p>
<!-- CL 489255 -->
<p>
<!-- cmd/compile: remove go:wasmimport restriction -->
</p>
<!-- https://go.dev/issue/56100 -->
<p>
The Go scheduler now interacts much more efficiently with the
JavaScript event loop, especially in applications that block
frequently on asynchronous events.
</p>
<h3 id="wasip1">WebAssembly System Interface</h3>
<p><!-- https://go.dev/issue/58141 -->
Go 1.21 adds an experimental port to the <a href="https://wasi.dev/">
WebAssembly System Interface (WASI)</a>, Preview 1
(<code>GOOS=wasip1</code>, <code>GOARCH=wasm</code>).
</p>
<p>
As a result of the addition of the new <code>GOOS</code> value
"<code>wasip1</code>", Go files named <code>*_wasip1.go</code>
will now be <a href="/pkg/go/build/#hdr-Build_Constraints">ignored
by Go tools</a> except when that <code>GOOS</code> value is being
used.
If you have existing filenames matching that pattern, you will
need to rename them.
</p>
<h2 id="tools">Tools</h2>
<!-- https://go.dev/issue/15513 -->
<p>
<!-- support compiling all tests without running -->
</p>
<h3 id="go-command">Go command</h3>
<p><!-- https://go.dev/issue/58099, CL 474236 -->
The <code>-pgo</code> build flag now defaults to <code>-pgo=auto</code>,
and the restriction of specifying a single main package on the command
line is now removed. If a file named <code>default.pgo</code> is present
in the main package's directory, the <code>go</code> command will use
it to enable profile-guided optimization for building the corresponding
program.
</p>
<p><!-- CL 453603 -->
TODO: <a href="https://go.dev/cl/453603">https://go.dev/cl/453603</a>: cmd/go, go/build: parse directives in file headers; modified api/next/56986.txt
</p>
<!-- CL 466397 -->
<p>
<!-- cmd/go: make go test build multiple executables; The go test command now supports using the -c flag with multiple packages. -->
</p>
<h2 id="runtime">Runtime</h2>
<p>
TODO: complete this section, or delete if not needed
</p>
<p><!-- https://go.dev/issue/7181 -->
When printing very deep stacks, the runtime now prints the first 50
(innermost) frames followed by the bottom 50 (outermost) frames,
rather than just printing the first 100 frames. This makes it easier
to see how deeply recursive stacks started, and is especially
valuable for debugging stack overflows.
</p>
<p><!-- https://go.dev/issue/59960 -->
On Linux platforms that support transparent huge pages, the Go runtime
now manages which parts of the heap may be backed by huge pages more
explicitly. This leads to better utilization of memory: small heaps
should see less memory used (up to 50% in pathological cases) while
large heaps should see fewer broken huge pages for dense parts of the
heap, improving CPU usage and latency by up to 1%.
</p>
<p><!-- https://go.dev/issue/57069, https://go.dev/issue/56966 -->
As a result of runtime-internal garbage collection tuning,
applications may see up to a 40% reduction in application tail latency
and a small decrease in memory use. Some applications may also observe
a small loss in throughput.
The memory use decrease should be proportional to the loss in
throughput, such that the previous release's throughput/memory
tradeoff may be recovered (with little change to latency) by
increasing <code>GOGC</code> and/or <code>GOMEMLIMIT</code> slightly.
</p>
<h2 id="compiler">Compiler</h2>
<!-- CL 490819 -->
<p>
<!-- cmd/cgo: reject attempts to declare methods on C types -->
</p>
<!-- CL 461315 -->
<p>
<!-- cmd/compile: enable deadcode of unreferenced large global maps -->
</p>
<p>
TODO: complete this section, or delete if not needed
</p>
<h2 id="linker">Linker</h2>
<!-- CL 457455 -->
<p>
<!-- cmd/link: generate .xdata PE section -->
</p>
<!-- CL 463395 -->
<p>
<!-- cmd/link: linker portion of dead map removal -->
</p>
<p>
TODO: complete this section, or delete if not needed
</p>
<h2 id="library">Core library</h2>
<h3 id="slog">New log/slog package</h3>
<p>
The new <a href="/pkg/log/slog">log/slog</a> package provides structured logging with levels.
Structured logging emits key-value pairs
to enable fast, accurate processing of large amounts of log data.
The package supports integration with popular log analysis tools and services.
</p>
<h3 id="minor_library_changes">Minor changes to the library</h3>
<p>
As always, there are various minor changes and updates to the library,
made with the Go 1 <a href="/doc/go1compat">promise of compatibility</a>
in mind.
There are also various performance improvements, not enumerated here.
</p>
<p><!-- CL 456837 -->
TODO: <a href="https://go.dev/cl/456837">https://go.dev/cl/456837</a>: all: upgrade Unicode from 13.0.0 to 15.0.0; modified api/except.txt, api/next/55079.txt
</p>
<p>
TODO: complete this section
</p>
<dl id="bytes"><dt><a href="/pkg/bytes/">bytes</a></dt>
<dd>
<p><!-- https://go.dev/issue/53685 -->
TODO: <a href="https://go.dev/issue/53685">https://go.dev/issue/53685</a>: add Buffer.Available and Buffer.AvailableBuffer
</p>
<p><!-- CL 474635 -->
TODO: <a href="https://go.dev/cl/474635">https://go.dev/cl/474635</a>: bytes: add Buffer.Available and Buffer.AvailableBuffer; modified api/next/53685.txt
</p>
</dd>
</dl><!-- bytes -->
<dl id="context"><dt><a href="/pkg/context/">context</a></dt>
<dd>
<p><!-- https://go.dev/issue/40221, CL 479918 -->
The new <a href="/pkg/context/#WithoutCancel"><code>WithoutCancel</code></a>
function returns a copy of a context that is not canceled when the original
context is canceled.
</p>
<p><!-- https://go.dev/issue/56661, CL 449318 -->
The new <a href="/pkg/context/#WithDeadlineCause"><code>WithDeadlineCause</code></a>
and <a href="/pkg/context/#WithTimeoutCause"><code>WithTimeoutCause</code></a>
functions provide a way to set a context cancellation cause when a deadline or
timer expires. The cause may be retrieved with the
<a href="/pkg/context/#Cause"><code>Cause</code></a> function.
</p>
<p><!-- https://go.dev/issue/57928, CL 482695 -->
The new <a href="/pkg/context/#AfterFunc"><code>AfterFunc</code></a>
function registers a function to run after a context has been cancelled.
</p>
</dd>
</dl>
<dl id="crypto/elliptic"><dt><a href="/pkg/crypto/elliptic/">crypto/elliptic</a></dt>
<dd>
<p><!-- CL 459977 -->
TODO: <a href="https://go.dev/cl/459977">https://go.dev/cl/459977</a>: crypto/elliptic: deprecate unsafe APIs; modified api/next/34648.txt, api/next/52221.txt
</p>
</dd>
</dl><!-- crypto/elliptic -->
<dl id="crypto/rsa"><dt><a href="/pkg/crypto/rsa/">crypto/rsa</a></dt>
<dd>
<p><!-- https://go.dev/issue/56921 -->
TODO: <a href="https://go.dev/issue/56921">https://go.dev/issue/56921</a>: deprecate GenerateMultiPrimeKey and PrecomputedValues.CRTValues
</p>
<p><!-- CL 459976 -->
TODO: <a href="https://go.dev/cl/459976">https://go.dev/cl/459976</a>: crypto/rsa: deprecate multiprime RSA support; modified api/next/56921.txt
</p>
</dd>
</dl><!-- crypto/rsa -->
<dl id="crypto/sha1"><dt><a href="/pkg/crypto/sha1/">crypto/sha1</a></dt>
<dd>
<p><!-- CL 483815 -->
TODO: <a href="https://go.dev/cl/483815">https://go.dev/cl/483815</a>: crypto/sha1: add WriteString and WriteByte method
</p>
</dd>
</dl><!-- crypto/sha1 -->
<dl id="crypto/sha256"><dt><a href="/pkg/crypto/sha256/">crypto/sha256</a></dt>
<dd>
<p><!-- https://go.dev/issue/50543 -->
TODO: <a href="https://go.dev/issue/50543">https://go.dev/issue/50543</a>: add native SHA256 instruction implementation for AMD64
</p>
<p><!-- CL 408795 -->
TODO: <a href="https://go.dev/cl/408795">https://go.dev/cl/408795</a>: crypto/sha256: add sha-ni implementation; crypto/sha256 uses Intel SHA extensions on new enough x86 processors, making it 3-4X faster.
</p>
<p><!-- CL 481478 -->
TODO: <a href="https://go.dev/cl/481478">https://go.dev/cl/481478</a>: crypto/sha256: add WriteString and WriteByte method
</p>
</dd>
</dl><!-- crypto/sha256 -->
<dl id="crypto/sha512"><dt><a href="/pkg/crypto/sha512/">crypto/sha512</a></dt>
<dd>
<p><!-- CL 483816 -->
TODO: <a href="https://go.dev/cl/483816">https://go.dev/cl/483816</a>: crypto/sha512: add WriteString and WriteByte method
</p>
</dd>
</dl><!-- crypto/sha512 -->
<dl id="crypto/x509"><dt><a href="/pkg/crypto/x509/">crypto/x509</a></dt>
<dd>
<p><!-- https://go.dev/issue/53573 -->
TODO: <a href="https://go.dev/issue/53573">https://go.dev/issue/53573</a>: surface ReasonCode inside x509.RevocationList entries
</p>
<p><!-- CL 468875 -->
TODO: <a href="https://go.dev/cl/468875">https://go.dev/cl/468875</a>: crypto/x509: surface ReasonCode in RevocationList API; modified api/next/53573.txt
</p>
</dd>
</dl><!-- crypto/x509 -->
<dl id="debug/elf"><dt><a href="/pkg/debug/elf/">debug/elf</a></dt>
<dd>
<p><!-- https://go.dev/issue/56887 -->
TODO: <a href="https://go.dev/issue/56887">https://go.dev/issue/56887</a>: add DT_FLAGS_1 (dynamic flags) constants
</p>
<p><!-- https://go.dev/issue/56892 -->
TODO: <a href="https://go.dev/issue/56892">https://go.dev/issue/56892</a>: add (*File).DynValue
</p>
<p><!-- CL 452496 -->
TODO: <a href="https://go.dev/cl/452496">https://go.dev/cl/452496</a>: debug/elf: add DT_FLAGS_1 constants; modified api/next/56887.txt
</p>
<p><!-- CL 452617 -->
TODO: <a href="https://go.dev/cl/452617">https://go.dev/cl/452617</a>: debug/elf: retrieve values for dynamic section tags; modified api/next/56892.txt
</p>
<p><!-- CL 473256 -->
TODO: <a href="https://go.dev/cl/473256">https://go.dev/cl/473256</a>: debug/elf: support zstd compression; modified api/next/55107.txt
</p>
</dd>
</dl><!-- debug/elf -->
<dl id="debug/pe"><dt><a href="/pkg/debug/pe/">debug/pe</a></dt>
<dd>
<p><!-- CL 488475 -->
TODO: <a href="https://go.dev/cl/488475">https://go.dev/cl/488475</a>: debug/pe: return error on reading from section with uninitialized data
</p>
</dd>
</dl><!-- debug/pe -->
<dl id="embed"><dt><a href="/pkg/embed/">embed</a></dt>
<dd>
<p><!-- https://go.dev/issue/57803 -->
TODO: <a href="https://go.dev/issue/57803">https://go.dev/issue/57803</a>: openFile should implement ReaderAt
</p>
<p><!-- CL 483235 -->
TODO: <a href="https://go.dev/cl/483235">https://go.dev/cl/483235</a>: embed: implement openFile.ReadAt
</p>
</dd>
</dl><!-- embed -->
<dl id="errors"><dt><a href="/pkg/errors/">errors</a></dt>
<dd>
<p><!-- https://go.dev/issue/41198 -->
TODO: <a href="https://go.dev/issue/41198">https://go.dev/issue/41198</a>: add ErrUnsupported
</p>
<p><!-- CL 473935 -->
TODO: <a href="https://go.dev/cl/473935">https://go.dev/cl/473935</a>: errors: add ErrUnsupported; modified api/next/41198.txt
</p>
</dd>
</dl><!-- errors -->
<dl id="flag"><dt><a href="/pkg/flag/">flag</a></dt>
<dd>
<p><!-- https://go.dev/issue/53747 -->
TODO: <a href="https://go.dev/issue/53747">https://go.dev/issue/53747</a>: add BoolFunc(name, usage string, fn func(string)error)
</p>
<p><!-- CL 476015 -->
TODO: <a href="https://go.dev/cl/476015">https://go.dev/cl/476015</a>: flag: add BoolFunc; FlagSet.BoolFunc; modified api/next/53747.txt
</p>
<p><!-- CL 480215 -->
TODO: <a href="https://go.dev/cl/480215">https://go.dev/cl/480215</a>: flag: panic if a flag is defined after being set
</p>
</dd>
</dl><!-- flag -->
<dl id="fs"><dt><a href="/pkg/fs/">fs</a></dt>
<dd>
<p><!-- https://go.dev/issue/54451 -->
TODO: <a href="https://go.dev/issue/54451">https://go.dev/issue/54451</a>: standard implementations of FileInfo and DirEntry should implement fmt.Stringer
</p>
</dd>
</dl><!-- fs -->
<dl id="go/ast"><dt><a href="/pkg/go/ast/">go/ast</a></dt>
<dd>
<p><!-- https://go.dev/issue/28089 -->
TODO: <a href="https://go.dev/issue/28089">https://go.dev/issue/28089</a>: add func IsGenerated(*File) bool
</p>
<p><!-- CL 476276 -->
TODO: <a href="https://go.dev/cl/476276">https://go.dev/cl/476276</a>: go/ast: add File.GoVersion; modified api/next/59033.txt
</p>
<p><!-- CL 487935 -->
TODO: <a href="https://go.dev/cl/487935">https://go.dev/cl/487935</a>: go/ast: add IsGenerated(*File) predicate; modified api/next/28089.txt
</p>
</dd>
</dl><!-- go/ast -->
<dl id="go/build"><dt><a href="/pkg/go/build/">go/build</a></dt>
<dd>
<p><!-- CL 453603 -->
TODO: <a href="https://go.dev/cl/453603">https://go.dev/cl/453603</a>: cmd/go, go/build: parse directives in file headers; modified api/next/56986.txt
</p>
</dd>
</dl><!-- go/build -->
<dl id="go/build/constraint"><dt><a href="/pkg/go/build/constraint/">go/build/constraint</a></dt>
<dd>
<p><!-- CL 476275 -->
TODO: <a href="https://go.dev/cl/476275">https://go.dev/cl/476275</a>: go/build/constraint: add GoVersion; modified api/next/59033.txt
</p>
</dd>
</dl><!-- go/build/constraint -->
<dl id="go/token"><dt><a href="/pkg/go/token/">go/token</a></dt>
<dd>
<p><!-- CL 464515 -->
TODO: <a href="https://go.dev/cl/464515">https://go.dev/cl/464515</a>: go/token: add (*File).Lines method; modified api/next/57708.txt
</p>
</dd>
</dl><!-- go/token -->
<dl id="hash/maphash"><dt><a href="/pkg/hash/maphash/">hash/maphash</a></dt>
<dd>
<p><!-- https://go.dev/issue/47342 -->
TODO: <a href="https://go.dev/issue/47342">https://go.dev/issue/47342</a>: Provide a `purego` implementation
</p>
<p><!-- CL 468795 -->
TODO: <a href="https://go.dev/cl/468795">https://go.dev/cl/468795</a>: hash/maphash: add purego implementation
</p>
</dd>
</dl><!-- hash/maphash -->
<dl id="io/fs"><dt><a href="/pkg/io/fs/">io/fs</a></dt>
<dd>
<p><!-- CL 489555 -->
TODO: <a href="https://go.dev/cl/489555">https://go.dev/cl/489555</a>: io/fs: add FormatFileInfo and FormatDirEntry functions; modified api/next/54451.txt
</p>
</dd>
</dl><!-- io/fs -->
<dl id="log/slog"><dt><a href="/pkg/log/slog/">log/slog</a></dt>
<dd>
<p><!-- https://go.dev/issue/59060 -->
TODO: <a href="https://go.dev/issue/59060">https://go.dev/issue/59060</a>: arg to Record.Attrs should return bool
</p>
<p><!-- https://go.dev/issue/59141 -->
TODO: <a href="https://go.dev/issue/59141">https://go.dev/issue/59141</a>: handle panics in LogValuer.LogValue
</p>
<p><!-- https://go.dev/issue/59204 -->
TODO: <a href="https://go.dev/issue/59204">https://go.dev/issue/59204</a>: change slog.Group signature to ...any
</p>
<p><!-- https://go.dev/issue/59280 -->
TODO: <a href="https://go.dev/issue/59280">https://go.dev/issue/59280</a>: ReplaceAttr gets Source struct instead of file:line
</p>
<p><!-- https://go.dev/issue/59282 -->
TODO: <a href="https://go.dev/issue/59282">https://go.dev/issue/59282</a>: drop only completely empty Attrs
</p>
<p><!-- https://go.dev/issue/59339 -->
TODO: <a href="https://go.dev/issue/59339">https://go.dev/issue/59339</a>: change constructors to NewXXXHandler(io.Writer, *HandlerOptions)
</p>
<p><!-- https://go.dev/issue/59345 -->
TODO: <a href="https://go.dev/issue/59345">https://go.dev/issue/59345</a>: JSONHandler should format everything like json.Marshal
</p>
<p><!-- CL 477295 -->
TODO: <a href="https://go.dev/cl/477295">https://go.dev/cl/477295</a>: log/slog: initial commit; modified api/next/56345.txt
</p>
<p><!-- CL 484096 -->
TODO: <a href="https://go.dev/cl/484096">https://go.dev/cl/484096</a>: log/slog: function argument to Record.Attrs returns bool; modified api/next/59060.txt
</p>
<p><!-- CL 486376 -->
TODO: <a href="https://go.dev/cl/486376">https://go.dev/cl/486376</a>: log/slog: add Source type for source location; modified api/next/59280.txt
</p>
<p><!-- CL 486415 -->
TODO: <a href="https://go.dev/cl/486415">https://go.dev/cl/486415</a>: log/slog: built-in handler constructors take options as a second arg; modified api/next/56345.txt, api/next/59339.txt
</p>
<p><!-- CL 487855 -->
TODO: <a href="https://go.dev/cl/487855">https://go.dev/cl/487855</a>: log/slog: Group takes ...any; modified api/next/56345.txt, api/next/59204.txt
</p>
</dd>
</dl><!-- log/slog -->
<dl id="maps"><dt><a href="/pkg/maps/">maps</a></dt>
<dd>
<p><!-- https://go.dev/issue/57436 -->
TODO: <a href="https://go.dev/issue/57436">https://go.dev/issue/57436</a>: new standard library package based on x/exp/maps
</p>
<p><!-- CL 464343 -->
TODO: <a href="https://go.dev/cl/464343">https://go.dev/cl/464343</a>: maps: new package; modified api/next/57436.txt
</p>
</dd>
</dl><!-- maps -->
<dl id="math"><dt><a href="/pkg/math/">math</a></dt>
<dd>
<p><!-- https://go.dev/issue/56491 -->
TODO: <a href="https://go.dev/issue/56491">https://go.dev/issue/56491</a>: add Compare and Compare32
</p>
<p><!-- CL 459435 -->
TODO: <a href="https://go.dev/cl/459435">https://go.dev/cl/459435</a>: math: add Compare and Compare32; modified api/next/56491.txt
</p>
<p><!-- CL 467515 -->
TODO: <a href="https://go.dev/cl/467515">https://go.dev/cl/467515</a>: math: add Compare and Compare32; modified api/next/56491.txt
</p>
</dd>
</dl><!-- math -->
<dl id="math/big"><dt><a href="/pkg/math/big/">math/big</a></dt>
<dd>
<p><!-- https://go.dev/issue/56984 -->
TODO: <a href="https://go.dev/issue/56984">https://go.dev/issue/56984</a>: add Int.Float64 conversion (was initially: {ToInt64,ToUint64,Float64})
</p>
<p><!-- CL 453115 -->
TODO: <a href="https://go.dev/cl/453115">https://go.dev/cl/453115</a>: math/big: add Int.Float64 conversion; modified api/next/56984.txt
</p>
</dd>
</dl><!-- math/big -->
<dl id="net"><dt><a href="/pkg/net/">net</a></dt>
<dd>
<p><!-- https://go.dev/issue/56539 -->
TODO: <a href="https://go.dev/issue/56539">https://go.dev/issue/56539</a>: add support for MPTCP
</p>
<p><!-- https://go.dev/issue/59166 -->
TODO: <a href="https://go.dev/issue/59166">https://go.dev/issue/59166</a>: add func (*TCPConn) MultipathTCP() (bool, error)
</p>
<p><!-- CL 471136 -->
TODO: <a href="https://go.dev/cl/471136">https://go.dev/cl/471136</a>: net: mptcp: implement dialMPTCP; modified api/next/56539.txt
</p>
<p><!-- CL 471137 -->
TODO: <a href="https://go.dev/cl/471137">https://go.dev/cl/471137</a>: net: mptcp: implement listenMPTCP; modified api/next/56539.txt
</p>
<p><!-- CL 471140 -->
TODO: <a href="https://go.dev/cl/471140">https://go.dev/cl/471140</a>: net: mptcp: add TCPConn&#39;s MultipathTCP checker; modified api/next/59166.txt
</p>
</dd>
</dl><!-- net -->
<dl id="net/http"><dt><a href="/pkg/net/http/">net/http</a></dt>
<dd>
<p><!-- https://go.dev/issue/44855 -->
TODO: <a href="https://go.dev/issue/44855">https://go.dev/issue/44855</a>: add ErrSchemeMismatch
</p>
<p><!-- CL 382117 -->
TODO: <a href="https://go.dev/cl/382117">https://go.dev/cl/382117</a>: net/http: expose &#34;http: server gave HTTP response to HTTPS client&#34; error; modified api/next/44855.txt
</p>
<p><!-- CL 472636 -->
TODO: <a href="https://go.dev/cl/472636">https://go.dev/cl/472636</a>: net/http: support full-duplex HTTP/1 responses; modified api/next/57786.txt
</p>
<p><!-- CL 494122 -->
TODO: <a href="https://go.dev/cl/494122">https://go.dev/cl/494122</a>: net/http: let ErrNotSupported match errors.ErrUnsupported; modified api/next/41198.txt
</p>
</dd>
</dl><!-- net/http -->
<dl id="os"><dt><a href="/pkg/os/">os</a></dt>
<dd>
<p><!-- https://go.dev/issue/32558 -->
TODO: <a href="https://go.dev/issue/32558">https://go.dev/issue/32558</a>: allow Chtimes with time.Time{} to avoid setting time
</p>
<p><!-- CL 219638 -->
TODO: <a href="https://go.dev/cl/219638">https://go.dev/cl/219638</a>: os: make Chtimes accept empty time values to skip file time modification
</p>
<p><!-- CL 477215 -->
TODO: <a href="https://go.dev/cl/477215">https://go.dev/cl/477215</a>: os: avoid creating a new file in Truncate on Windows; os.Truncate on Windows no longer now fails if the file does not exist, consistent with other platforms
</p>
<p><!-- CL 493036 -->
TODO: <a href="https://go.dev/cl/493036">https://go.dev/cl/493036</a>: os, syscall: support ill-formed UTF-16 strings on Windows
</p>
</dd>
</dl><!-- os -->
<dl id="os/user"><dt><a href="/pkg/os/user/">os/user</a></dt>
<dd>
<p><!-- CL 459455 -->
TODO: <a href="https://go.dev/cl/459455">https://go.dev/cl/459455</a>: os/user: lookup Linux users and groups via systemd userdb
</p>
</dd>
</dl><!-- os/user -->
<dl id="reflect"><dt><a href="/pkg/reflect/">reflect</a></dt>
<dd>
<p><!-- CL 408826, CL 413474 -->
In Go 1.21, <a href="/pkg/reflect/#ValueOf"><code>ValueOf</code></a>
no longer forces its argument to be allocated on the heap, allowing
a <code>Value</code>'s content to be allocated on the stack. Most
operations on a <code>Value</code> also allow the underlying value
to be stack allocated.
</p>
<p><!-- https://go.dev/issue/55002 -->
TODO: <a href="https://go.dev/issue/55002">https://go.dev/issue/55002</a>: add Value.Clear
</p>
<p><!-- https://go.dev/issue/56906 -->
TODO: <a href="https://go.dev/issue/56906">https://go.dev/issue/56906</a>: deprecate SliceHeader and StringHeader
</p>
<p><!-- CL 452762 -->
TODO: <a href="https://go.dev/cl/452762">https://go.dev/cl/452762</a>: reflect: deprecate SliceHeader and StringHeader; modified api/next/56906.txt
</p>
</dd>
</dl><!-- reflect -->
<dl id="regexp"><dt><a href="/pkg/regexp/">regexp</a></dt>
<dd>
<p><!-- https://go.dev/issue/46159 -->
TODO: <a href="https://go.dev/issue/46159">https://go.dev/issue/46159</a>: support encoding.TextMarshaler
</p>
<p><!-- CL 479401 -->
TODO: <a href="https://go.dev/cl/479401">https://go.dev/cl/479401</a>: regexp: add Regexp.TextMarshaler/TextUnmarshaler; modified api/next/46159.txt
</p>
</dd>
</dl><!-- regexp -->
<dl id="runtime"><dt><a href="/pkg/runtime/">runtime</a></dt>
<dd>
<p><!-- https://go.dev/issue/38651 -->
TODO: <a href="https://go.dev/issue/38651">https://go.dev/issue/38651</a>: add &#39;created by goroutine number&#39; to stack traces
</p>
<p><!-- https://go.dev/issue/57441 -->
TODO: <a href="https://go.dev/issue/57441">https://go.dev/issue/57441</a>: use WER for GOTRACEBACK=wer on Windows
</p>
<p><!-- CL 447778 -->
TODO: <a href="https://go.dev/cl/447778">https://go.dev/cl/447778</a>: runtime: reimplement GODEBUG=cgocheck=2 as a GOEXPERIMENT
</p>
<p><!-- CL 472195 -->
TODO: <a href="https://go.dev/cl/472195">https://go.dev/cl/472195</a>: runtime: remove NOFRAME from asmcgocall, systemstack and mcall
</p>
<p><!-- CL 474915 -->
TODO: <a href="https://go.dev/cl/474915">https://go.dev/cl/474915</a>: runtime: support GOTRACEBACK=wer on Windows
</p>
<p><!-- https://go.dev/issue/46787 -->
A new type <code>Pinner</code> has been added to the runtime
package. <code>Pinner</code>s may be used to "pin" Go memory
such that it may be used more freely by non-Go code. For instance,
passing Go values that reference pinned Go memory to C code is
now allowed. Previously, passing any such nested reference was
disallowed by the
<a href="https://pkg.go.dev/cmd/cgo#hdr-Passing_pointers">cgo pointer passing rules.</a>
See <a href="/pkg/runtime#Pinner">the docs</a> for more details.
</p>
</dd>
</dl><!-- runtime -->
<dl id="runtime/trace"><dt><a href="/pkg/runtime/trace/">runtime/trace</a></dt>
<dd>
<p><!-- https://go.dev/issue/16638 -->
Collecting traces on amd64 and arm64 now incurs a substantially
smaller CPU cost: up to a 10x improvement over the previous release.
</p>
<p><!-- CL 494495 -->
Traces now contain explicit stop-the-world events for every reason
the Go runtime might stop-the-world, not just garbage collection.
</p>
</dd>
</dl><!-- runtime/trace -->
<dl id="runtime/metrics"><dt><a href="/pkg/runtime/metrics/">runtime/metrics</a></dt>
<dd>
<p><!-- https://go.dev/issue/56857 -->
A few previously-internal GC metrics, such as live heap size, are
now available.
<code>GOGC</code> and <code>GOMEMLIMIT</code> are also now
available as metrics.
</p>
</dd>
</dl><!-- runtime/metrics -->
<dl id="slices"><dt><a href="/pkg/slices/">slices</a></dt>
<dd>
<p><!-- https://go.dev/issue/54768 -->
TODO: <a href="https://go.dev/issue/54768">https://go.dev/issue/54768</a>: add DeleteFunc
</p>
<p><!-- https://go.dev/issue/57433 -->
TODO: <a href="https://go.dev/issue/57433">https://go.dev/issue/57433</a>: new standard library package based on x/exp/slices
</p>
<p><!-- CL 467417 -->
TODO: <a href="https://go.dev/cl/467417">https://go.dev/cl/467417</a>: slices: new package; modified api/next/57433.txt
</p>
<p><!-- CL 483175 -->
TODO: <a href="https://go.dev/cl/483175">https://go.dev/cl/483175</a>: slices: add DeleteFunc; modified api/next/54768.txt
</p>
</dd>
</dl><!-- slices -->
<dl id="spec"><dt><a href="/pkg/spec/">spec</a></dt>
<dd>
<p><!-- https://go.dev/issue/56351 -->
TODO: <a href="https://go.dev/issue/56351">https://go.dev/issue/56351</a>: add clear(x) builtin, to clear map, zero content of slice
</p>
<p><!-- https://go.dev/issue/57411 -->
TODO: <a href="https://go.dev/issue/57411">https://go.dev/issue/57411</a>: define initialization order more precisely
</p>
<p><!-- https://go.dev/issue/59338 -->
TODO: <a href="https://go.dev/issue/59338">https://go.dev/issue/59338</a>: infer type arguments from assignments of generic functions (reverse type inference)
</p>
</dd>
</dl><!-- spec -->
<dl id="slices"><dt><a href="/pkg/slices/">slices</a></dt>
<dd>
<p><!-- https://go.dev/issue/45955 -->
The new <a href="/pkg/slices/"><code>slices</code></a> package
provides many common operations on slices, using generic
functions that work with slices of any element type.
</p>
</dd>
</dl>
<dl id="sync"><dt><a href="/pkg/sync/">sync</a></dt>
<dd>
<p><!-- https://go.dev/issue/56102, CL 451356 -->
The new <a href="/pkg/sync/#OnceFunc"><code>OnceFunc</code></a>,
<a href="/pkg/sync/#OnceValue"><code>OnceValue</code></a>, and
<a href="/pkg/sync/#OnceValues"><code>OnceValues</code></a>
functions capture a common use of <a href="/pkg/sync/#Once">Once</a> to
lazily initialize a value on first use.
</p>
</dd>
</dl>
<dl id="syscall"><dt><a href="/pkg/syscall/">syscall</a></dt>
<dd>
<p><!-- https://go.dev/issue/46259 -->
TODO: <a href="https://go.dev/issue/46259">https://go.dev/issue/46259</a>: add Jail int32 to SysProcAttr on FreeBSD
</p>
<p><!-- CL 458335 -->
TODO: <a href="https://go.dev/cl/458335">https://go.dev/cl/458335</a>: syscall: add jail support to ForkExec on FreeBSD; modified api/next/46259.txt
</p>
<p><!-- CL 480135 -->
TODO: <a href="https://go.dev/cl/480135">https://go.dev/cl/480135</a>: syscall: implement Fchdir on Windows
</p>
</dd>
</dl><!-- syscall -->
<dl id="testing"><dt><a href="/pkg/testing/">testing</a></dt>
<dd>
<p><!-- https://go.dev/issue/37708 -->
TODO: <a href="https://go.dev/issue/37708">https://go.dev/issue/37708</a>: optionally include full (or relative) path name
</p>
<p><!-- https://go.dev/issue/52600, CL 475496 -->
The new <a href="/pkg/testing/#Testing"><code>Testing</code></a> function reports whether the program is a test created by <code>go</code> <code>test</code>.
</p>
</dd>
</dl><!-- testing -->
<dl id="testing/slogtest"><dt><a href="/pkg/testing/slogtest/">testing/slogtest</a></dt>
<dd>
<p><!-- CL 487895 -->
TODO: <a href="https://go.dev/cl/487895">https://go.dev/cl/487895</a>: testing/slogtest: tests for slog handlers; modified api/next/56345.txt
</p>
</dd>
</dl><!-- testing/slogtest -->
<dl id="x/exp/slices"><dt><a href="/pkg/x/exp/slices/">x/exp/slices</a></dt>
<dd>
<p><!-- https://go.dev/issue/57348 -->
TODO: <a href="https://go.dev/issue/57348">https://go.dev/issue/57348</a>: Allow different types for haystack/needle in BinarySearchFunc
</p>
</dd>
</dl><!-- x/exp/slices -->
<dl id="x/sys/windows"><dt><a href="/pkg/x/sys/windows/">x/sys/windows</a></dt>
<dd>
<p><!-- https://go.dev/issue/54232 -->
TODO: <a href="https://go.dev/issue/54232">https://go.dev/issue/54232</a>: Add WSALookupService
</p>
</dd>
</dl><!-- x/sys/windows -->
<dl id="x/tools/go/analysis"><dt><a href="/pkg/x/tools/go/analysis/">x/tools/go/analysis</a></dt>
<dd>
<p><!-- https://go.dev/issue/57906 -->
TODO: <a href="https://go.dev/issue/57906">https://go.dev/issue/57906</a>: add Analyzer.URL and Diagnostic.URL fields
</p>
</dd>
</dl><!-- x/tools/go/analysis -->
<dl id="x/tools/go/types/objectpath"><dt><a href="/pkg/x/tools/go/types/objectpath/">x/tools/go/types/objectpath</a></dt>
<dd>
<p><!-- https://go.dev/issue/58668 -->
TODO: <a href="https://go.dev/issue/58668">https://go.dev/issue/58668</a>: add Encoder type, to amortize Scope.Names
</p>
</dd>
</dl><!-- x/tools/go/types/objectpath -->
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