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https://github.com/golang/go
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doc/go1.20: finish most standard library TODOs
Change-Id: Id8f074b96d28ae37a3d2d2a52a2b80cc53cd1203 Reviewed-on: https://go-review.googlesource.com/c/go/+/452760 TryBot-Bypass: Russ Cox <rsc@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Russ Cox
parent
109de31a1e
commit
036696a2ea
188
doc/go1.20.html
188
doc/go1.20.html
@ -101,7 +101,7 @@ Do not send CLs removing the interior tags from such phrases.
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the packages named on the command line.
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</p>
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<p><!-- https://go.dev/issue/45454 -->
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<p><!-- https://go.dev/issue/45454 --><!-- CL 421434 -->
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The <code>go</code> command now defines
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architecture feature build tags, such as <code>amd64.v2</code>,
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to allow selecting a package implementation file based on the presence
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@ -432,11 +432,17 @@ proxyHandler := &httputil.ReverseProxy{
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<dl id="bytes"><dt><a href="/pkg/bytes/">bytes</a></dt>
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<dd>
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<p><!-- CL 407176 -->
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TODO: <a href="https://go.dev/cl/407176">https://go.dev/cl/407176</a>: strings, bytes: add CutPrefix and CutSuffix
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The new
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<a href="/pkg/bytes/#CutPrefix"><code>CutPrefix</code></a> and
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<a href="/pkg/bytes/#CutSuffix"><code>CutSuffix</code></a> functions
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are like <a href="/pkg/bytes/#TrimPrefix"><code>TrimPrefix</code></a>
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and <a href="/pkg/bytes/#TrimSuffix"><code>TrimSuffix</code></a>
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but also report whether the string was trimmed.
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</p>
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<p><!-- CL 359675 -->
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TODO: <a href="https://go.dev/cl/359675">https://go.dev/cl/359675</a>: bytes: add Clone function
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The new <a href="/pkg/bytes/#Clone"><code>Clone</code></a> function
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allocates a copy of a byte slice.
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</p>
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</dd>
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</dl><!-- bytes -->
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@ -537,20 +543,20 @@ proxyHandler := &httputil.ReverseProxy{
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<dl id="encoding/xml"><dt><a href="/pkg/encoding/xml/">encoding/xml</a></dt>
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<dd>
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<p><!-- https://go.dev/issue/53346 -->
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TODO: <a href="https://go.dev/issue/53346">https://go.dev/issue/53346</a>: Add (*Encoder).Close() to check for unclosed elements
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<p><!-- https://go.dev/issue/53346 --><!-- CL 424777 -->
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The new <a href="/pkg/encoding/xml/#Encoder.Close"><code>Encoder.Close</code></a> method
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can be used to check for unclosed elements when finished encoding.
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</p>
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<p><!-- CL 424777 -->
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TODO: <a href="https://go.dev/cl/424777">https://go.dev/cl/424777</a>: encoding/xml: add (*Encoder).Close
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</p>
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<p><!-- CL 103875 -->
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TODO: <a href="https://go.dev/cl/103875">https://go.dev/cl/103875</a>: encoding/xml: error when more than one colon in qualified names
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<p><!-- CL 103875 --><!-- CL 105636 -->
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The decoder now rejects element and attribute names with more than one colon,
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such as <code><a:b:c></code>,
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as well as namespaces that resolve to an empty string, such as <code>xmlns:a=""</code>.
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</p>
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<p><!-- CL 107255 -->
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TODO: <a href="https://go.dev/cl/107255">https://go.dev/cl/107255</a>: encoding/xml: error when closing tag does not match opening tag
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The decoder now rejects elements that use different namespace prefixes in the opening and closing tag,
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even if those prefixes both denote the same namespace.
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</p>
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</dd>
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</dl><!-- encoding/xml -->
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@ -569,12 +575,11 @@ proxyHandler := &httputil.ReverseProxy{
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The <a href="/pkg/fmt/#Errorf"><code>Errorf</code></a> function supports multiple occurrences of
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the <code>%w</code> format verb, returning an error that unwraps to the list of all arguments to <code>%w</code>.
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</p>
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<p><!-- https://go.dev/issue/51668 -->
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TODO: <a href="https://go.dev/issue/51668">https://go.dev/issue/51668</a>: add FormatString(State) string
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</p>
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<p><!-- CL 400875 -->
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TODO: <a href="https://go.dev/cl/400875">https://go.dev/cl/400875</a>: fmt: add a function to recover the original format string given a State; modified api/next/51668.txt
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<p><!-- https://go.dev/issue/51668 --><!-- CL 400875 -->
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The new <a href="/pkg/fmt/#FormatString"><code>FormatString</code></a> function recovers the
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formatting directive corresponding to a <a href="/pkg/fmt/#State"><code>State</code></a>,
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which can be useful in <a href="/pkg/fmt/#Formatter"><code>Formatter</code></a>.
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implementations.
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</p>
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</dd>
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</dl><!-- fmt -->
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@ -591,14 +596,6 @@ proxyHandler := &httputil.ReverseProxy{
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</dd>
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</dl><!-- go/ast -->
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<dl id="go/build"><dt><a href="/pkg/go/build/">go/build</a></dt>
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<dd>
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<p><!-- CL 421434 -->
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TODO: <a href="https://go.dev/cl/421434">https://go.dev/cl/421434</a>: go/build: add GO$GOARCH-based ToolTags
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</p>
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</dd>
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</dl><!-- go/build -->
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<dl id="go/token"><dt><a href="/pkg/go/token/">go/token</a></dt>
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<dd>
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<p><!-- CL 410114 -->
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@ -609,20 +606,21 @@ proxyHandler := &httputil.ReverseProxy{
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<dl id="io"><dt><a href="/pkg/io/">io</a></dt>
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<dd>
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<p><!-- https://go.dev/issue/45899 -->
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TODO: <a href="https://go.dev/issue/45899">https://go.dev/issue/45899</a>: add OffsetWriter, NewOffsetWriter
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</p>
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<p><!-- CL 406776 -->
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TODO: <a href="https://go.dev/cl/406776">https://go.dev/cl/406776</a>: io: add OffsetWriter, NewOffsetWriter; modified api/next/45899.txt
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<p><!-- https://go.dev/issue/45899 --><!-- CL 406776 -->
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The new <a href="/pkg/io/#OffsetWriter"><code>OffsetWriter</code></a> wraps an underlying
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<a href="/pkg/io/#WriterAt"><code>WriterAt</code></a>
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and provides <code>Seek</code>, <code>Write</code>, and <code>WriteAt</code> methods
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that adjust their effective file offset position by a fixed amount.
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</p>
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</dd>
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</dl><!-- io -->
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<dl id="io/fs"><dt><a href="/pkg/io/fs/">io/fs</a></dt>
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<dd>
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<p><!-- CL 363814 -->
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TODO: <a href="https://go.dev/cl/363814">https://go.dev/cl/363814</a>: path/filepath, io/fs: add SkipAll; modified api/next/47209.txt
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<p><!-- CL 363814 --><!-- https://go.dev/issue/47209 -->
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The new error <a href="/pkg/io/fs/#SkipAll"><code>SkipAll</code></a>
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terminates a <a href="/pkg/io/fs/#WalkDir"><code>WalkDir</code></a>
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immediately but successfully.
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</p>
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</dd>
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</dl><!-- io -->
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@ -757,16 +755,12 @@ proxyHandler := &httputil.ReverseProxy{
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<dl id="net/netip"><dt><a href="/pkg/net/netip/">net/netip</a></dt>
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<dd>
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<p><!-- https://go.dev/issue/51766 -->
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TODO: <a href="https://go.dev/issue/51766">https://go.dev/issue/51766</a>: add IPv6LinkLocalAllRouters
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</p>
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<p><!-- https://go.dev/issue/51777 -->
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TODO: <a href="https://go.dev/issue/51777">https://go.dev/issue/51777</a>: add IPv6Loopback
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</p>
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<p><!-- CL 412475 -->
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TODO: <a href="https://go.dev/cl/412475">https://go.dev/cl/412475</a>: net/netip: add IPv6LinkLocalAllRouters and IPv6Loopback; modified api/next/51766.txt, api/next/51777.txt
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<p><!-- https://go.dev/issue/51766 --><!-- https://go.dev/issue/51777 --><!-- CL 412475 -->
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The new <a href="/pkg/net/netip/#IPv6LinkLocalAllRouters">IPv6LinkLocalAllRouters</a>
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and <a href="/pkg/net/netip/#IPv6Loopback">IPv6Loopback</a> functions
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are the <code>net/netip</code> equivalents of
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<a href="/pkg/net/#IPv6loopback"><code>net.IPv6loopback</code></a> and
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<a href="/pkg/net/#IPv6linklocalallrouters"><code>net.IPv6linklocalallrouters</code></a>.
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</p>
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</dd>
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</dl><!-- net/netip -->
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@ -795,7 +789,9 @@ proxyHandler := &httputil.ReverseProxy{
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<dl id="path/filepath"><dt><a href="/pkg/path/filepath/">path/filepath</a></dt>
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<dd>
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<p><!-- CL 363814 --><!-- https://go.dev/issue/47209 -->
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TODO: <a href="https://go.dev/cl/363814">https://go.dev/cl/363814</a>: path/filepath, io/fs: add SkipAll; modified api/next/47209.txt
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The new error <a href="/pkg/path/filepath/#SkipAll"><code>SkipAll</code></a>
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terminates a <a href="/pkg/path/filepath/#Walk"><code>Walk</code></a>
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immediately but successfully.
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</p>
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<p><!-- https://go.dev/issue/56219 -->
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The new <a href="/pkg/path/filepath/#IsLocal"><code>IsLocal</code></a> function reports whether a path is
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@ -809,36 +805,29 @@ proxyHandler := &httputil.ReverseProxy{
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<dl id="reflect"><dt><a href="/pkg/reflect/">reflect</a></dt>
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<dd>
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<p><!-- https://go.dev/issue/46746 -->
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TODO: <a href="https://go.dev/issue/46746">https://go.dev/issue/46746</a>: add Value.Equal, Value.Comparable
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<p><!-- https://go.dev/issue/46746 --><!-- CL 423794 -->
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The new <a href="/pkg/reflect/#Value.Comparable"><code>Value.Comparable</code></a> and
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<a href="/pkg/reflect/#Value.Equal"><code>Value.Equal</code></a> methods
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can be used to compare two <code>Value</code>s for equality.
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<code>Comparable</code> reports whether <code>Equal</code> is a valid operation for a given <code>Value</code> receiver.
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</p>
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<p><!-- https://go.dev/issue/48000 -->
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TODO: <a href="https://go.dev/issue/48000">https://go.dev/issue/48000</a>: add reflect.Value.Grow
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<p><!-- https://go.dev/issue/48000 --><!-- CL 389635 -->
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The new <a href="/pkg/reflect/#Value.Grow"><code>Value.Grow</code></a> method
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extends a slice to guarantee space for another <code>n</code> elements.
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</p>
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<p><!-- https://go.dev/issue/52376 -->
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TODO: <a href="https://go.dev/issue/52376">https://go.dev/issue/52376</a>: add Value.SetZero
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</p>
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<p><!-- CL 389635 -->
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TODO: <a href="https://go.dev/cl/389635">https://go.dev/cl/389635</a>: reflect: add Value.Grow
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</p>
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<p><!-- CL 411476 -->
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TODO: <a href="https://go.dev/cl/411476">https://go.dev/cl/411476</a>: reflect: add Value.SetZero
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</p>
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<p><!-- CL 423794 -->
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TODO: <a href="https://go.dev/cl/423794">https://go.dev/cl/423794</a>: reflect: add Value.{Comparable,Equal}
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<p><!-- https://go.dev/issue/52376 --><!-- CL 411476 -->
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The new <a href="/pkg/reflect/#Value.SetZero"><code>Value.SetZero</code></a> method
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sets a value to be the zero value for its type.
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</p>
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<p><!-- CL 425184 -->
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TODO: <a href="https://go.dev/cl/425184">https://go.dev/cl/425184</a>: reflect: fix Value.SetIterXXX to check for the read-only bit
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</p>
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<p><!-- CL 428757 -->
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TODO: <a href="https://go.dev/cl/428757">https://go.dev/cl/428757</a>: reflect: deprecate SliceHeader and StringHeader
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Go 1.18 introduced <a href="/pkg/reflect/#Value.SetIterKey"><code>Value.SetIterKey</code></a>
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and <a href="/pkg/reflect/#Value.SetIterValue"><code>Value.SetIterValue</code></a> methods.
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These are optimizations: <code>v.SetIterKey(it)</code> is meant to be equivalent to <code>v.Set(it.Key())</code>.
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The implementations incorrectly omitted a check for use of unexported fields that was present in the unoptimized forms.
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Go 1.20 corrects these methods to include the unexported field check.
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</p>
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</dd>
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</dl><!-- reflect -->
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@ -846,7 +835,12 @@ proxyHandler := &httputil.ReverseProxy{
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<dl id="regexp"><dt><a href="/pkg/regexp/">regexp</a></dt>
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<dd>
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<p><!-- CL 444817 -->
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TODO: <a href="https://go.dev/cl/444817">https://go.dev/cl/444817</a>: regexp: add ErrLarge error; modified api/next/56041.txt
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Go 1.19.2 and Go 1.18.7 included a security fix to the regular expression parser,
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making it reject very large expressions that would consume too much memory.
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Because Go patch releases do not introduce new API,
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the parser returned <a href="/pkg/regexp/syntax/#ErrInternalError"><code>syntax.ErrInternalError</code></a> in this case.
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Go 1.20 adds a more specific error, <a href="/pkg/regexp/syntax/#ErrLarge"><code>syntax.ErrLarge</code></a>,
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which the parser now returns instead.
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</p>
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</dd>
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</dl><!-- regexp -->
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@ -859,22 +853,20 @@ proxyHandler := &httputil.ReverseProxy{
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</dd>
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</dl><!-- runtime/metrics -->
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<dl id="strconv"><dt><a href="/pkg/strconv/">strconv</a></dt>
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<dd>
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<p><!-- CL 345488 -->
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TODO: <a href="https://go.dev/cl/345488">https://go.dev/cl/345488</a>: strconv: optimize Parse for []byte arguments
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</p>
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</dd>
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</dl><!-- strconv -->
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<dl id="strings"><dt><a href="/pkg/strings/">strings</a></dt>
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<dd>
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<p><!-- https://go.dev/issue/42537 -->
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TODO: <a href="https://go.dev/issue/42537">https://go.dev/issue/42537</a>: add CutPrefix and CutSuffix
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<p><!-- CL 407176 -->
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The new
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<a href="/pkg/bytes/#CutPrefix"><code>CutPrefix</code></a> and
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<a href="/pkg/bytes/#CutSuffix"><code>CutSuffix</code></a> functions
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are like <a href="/pkg/bytes/#TrimPrefix"><code>TrimPrefix</code></a>
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and <a href="/pkg/bytes/#TrimSuffix"><code>TrimSuffix</code></a>
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but also report whether the string was trimmed.
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</p>
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<p><!-- https://go.dev/issue/45038 -->
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TODO: <a href="https://go.dev/issue/45038">https://go.dev/issue/45038</a>: bytes, strings: add Clone
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<p><!-- CL 359675 -->
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The new <a href="/pkg/strings/#Clone"><code>Clone</code></a> function
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allocates a copy of a string.
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</p>
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</dd>
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</dl><!-- strings -->
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@ -918,36 +910,38 @@ proxyHandler := &httputil.ReverseProxy{
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<dl id="time"><dt><a href="/pkg/time/">time</a></dt>
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<dd>
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<p><!-- https://go.dev/issue/52746 -->
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TODO: <a href="https://go.dev/issue/52746">https://go.dev/issue/52746</a>: add DateTime, DateOnly, TimeOnly format constants
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</p>
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<p><!-- CL 412495 -->
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TODO: <a href="https://go.dev/cl/412495">https://go.dev/cl/412495</a>: time: add DateTime, DateOnly, and TimeOnly
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<p><!-- https://go.dev/issue/52746 --><!-- CL 412495 -->
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The new time layout constants <a href="/pkg/time/#DateTime"><code>DateTime</code></a>,
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<a href="/pkg/time/#DateOnly"><code>DateOnly</code></a>, and
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<a href="/pkg/time/#TimeOnly"><code>TimeOnly</code></a>
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provide names for three of the most common layout strings used in a survey of public Go source code.
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</p>
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<p><!-- CL 382734 --><!-- https://go.dev/issue/50770 -->
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TODO: <a href="https://go.dev/cl/382734">https://go.dev/cl/382734</a>: time: implement Compare method
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The new <a href="/pkg/time/#Time.Compare"><code>Time.Compare</code></a> method
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compares two times.
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</p>
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<p><!-- CL 425037 -->
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TODO: <a href="https://go.dev/cl/425037">https://go.dev/cl/425037</a>: time: fix Parse to ignore extra sub-nanosecond digits
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<a href="/pkg/time/#Parse"><code>Parse</code></a>
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now ignores sub-nanosecond precision in its input,
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instead of reporting those digits as an error.
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</p>
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<p><!-- CL 444277 -->
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TODO: <a href="https://go.dev/cl/444277">https://go.dev/cl/444277</a>: time: implement strict RFC 3339 during marshal and unmarshal
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The <a href="/pkg/time/#Time.MarshalJSON"><code>Time.MarshalJSON</code></a> and
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<a href="/pkg/time/#Time.UnmarshalJSON"><code>Time.UnmarshalJSON</code></a> methods
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are now more strict about adherence to RFC 3339.
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</p>
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</dd>
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</dl><!-- time -->
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<dl id="unicode/utf16"><dt><a href="/pkg/unicode/utf16/">unicode/utf16</a></dt>
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<dd>
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<p><!-- https://go.dev/issue/51896 -->
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TODO: <a href="https://go.dev/issue/51896">https://go.dev/issue/51896</a>: add AppendRune
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</p>
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<p><!-- CL 409054 -->
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TODO: <a href="https://go.dev/cl/409054">https://go.dev/cl/409054</a>: unicode/utf16: add AppendRune; modified api/next/51896.txt
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<p><!-- https://go.dev/issue/51896 --><!-- CL 409054 -->
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The new <a href="/pkg/unicode/utf16/#AppendRune"><code>AppendRune</code></a>
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function appends the UTF-16 encoding of a given rune to a uint16 slice,
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analogous to <a href="/pkg/unicode/utf8/#AppendRune"><code>utf8.AppendRune</code></a>.
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</p>
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</dd>
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</dl><!-- unicode/utf16 -->
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@ -967,3 +961,5 @@ proxyHandler := &httputil.ReverseProxy{
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<!-- https://go.dev/issue/50035 https://go.dev/issue/54237 x/time/rate -->
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<!-- CL 421879: cmd/cgo: add and use runtime/cgo.Incomplete instead of //go:notinheap -->
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<!-- https://go.dev/issue/46731: replace `//go:notinheap` with runtime/internal/sys.NotInHeap -->
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<!-- CL 345488 strconv optimization -->
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<!-- CL 428757 reflect deprecation, rolled back -->
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@ -3284,7 +3284,8 @@ func (v Value) CanConvert(t Type) bool {
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// Comparable reports whether the value v is comparable.
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// If the type of v is an interface, this checks the dynamic type.
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// If this reports true then v.Interface() == x will not panic for any x.
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// If this reports true then v.Interface() == x will not panic for any x,
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// nor will v.Equal(u) for any Value u.
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func (v Value) Comparable() bool {
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k := v.Kind()
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switch k {
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