mirror of
https://github.com/golang/go
synced 2024-11-12 07:40:23 -07:00
9e073b504f
Updates #37519.
Change-Id: Iddf88a24334d4740f9c40caa2354127298692eeb
GitHub-Last-Rev: deda4c858b
GitHub-Pull-Request: golang/go#41545
Reviewed-on: https://go-review.googlesource.com/c/go/+/256419
Reviewed-by: Jay Conrod <jayconrod@google.com>
Trust: Jay Conrod <jayconrod@google.com>
Trust: Bryan C. Mills <bcmills@google.com>
235 lines
8.2 KiB
HTML
235 lines
8.2 KiB
HTML
<!--{
|
|
"Title": "Go 1.16 Release Notes",
|
|
"Path": "/doc/go1.16"
|
|
}-->
|
|
|
|
<!--
|
|
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 1.16</h2>
|
|
|
|
<p>
|
|
<strong>
|
|
Go 1.16 is not yet released. These are work-in-progress
|
|
release notes. Go 1.16 is expected to be released in February 2021.
|
|
</strong>
|
|
</p>
|
|
|
|
<h2 id="language">Changes to the language</h2>
|
|
|
|
<p>
|
|
TODO
|
|
</p>
|
|
|
|
<h2 id="ports">Ports</h2>
|
|
|
|
<p>
|
|
TODO
|
|
</p>
|
|
|
|
<h2 id="tools">Tools</h2>
|
|
|
|
<p>
|
|
TODO
|
|
</p>
|
|
|
|
<h3 id="go-command">Go command</h3>
|
|
|
|
<h4 id="modules">Modules</h4>
|
|
|
|
<p><!-- golang.org/issue/40276 -->
|
|
<code>go</code> <code>install</code> now accepts arguments with
|
|
version suffixes (for example, <code>go</code> <code>install</code>
|
|
<code>example.com/cmd@v1.0.0</code>). This causes <code>go</code>
|
|
<code>install</code> to build and install packages in module-aware mode,
|
|
ignoring the <code>go.mod</code> file in the current directory or any parent
|
|
directory, if there is one. This is useful for installing executables without
|
|
affecting the dependencies of the main module.<br>
|
|
TODO: write and link to section in golang.org/ref/mod<br>
|
|
TODO: write and link to blog post
|
|
</p>
|
|
|
|
<p><!-- golang.org/issue/24031 -->
|
|
<code>retract</code> directives may now be used in a <code>go.mod</code> file
|
|
to indicate that certain published versions of the module should not be used
|
|
by other modules. A module author may retract a version after a severe problem
|
|
is discovered or if the version was published unintentionally.<br>
|
|
TODO: write and link to section in golang.org/ref/mod<br>
|
|
TODO: write and link to tutorial or blog post
|
|
</p>
|
|
|
|
<p><!-- golang.org/issue/26603 -->
|
|
The <code>go</code> <code>mod</code> <code>vendor</code>
|
|
and <code>go</code> <code>mod</code> <code>tidy</code> subcommands now accept
|
|
the <code>-e</code> flag, which instructs them to proceed despite errors in
|
|
resolving missing packages.
|
|
</p>
|
|
|
|
<h4 id="go-test"><code>go</code> <code>test</code></h4>
|
|
|
|
<p><!-- golang.org/issue/29062 -->
|
|
When using <code>go</code> <code>test</code>, a test that
|
|
calls <code>os.Exit(0)</code> during execution of a test function
|
|
will now be considered to fail.
|
|
This will help catch cases in which a test calls code that calls
|
|
<code>os.Exit(0)</code> and thereby stops running all future tests.
|
|
If a <code>TestMain</code> function calls <code>os.Exit(0)</code>
|
|
that is still considered to be a passing test.
|
|
</p>
|
|
|
|
<p><!-- golang.org/issue/37519 -->
|
|
The <code>go</code> <code>get</code> <code>-insecure</code> flag is
|
|
deprecated and will be removed in a future version. The <code>GOINSECURE</code>
|
|
environment variable should be used instead, since it provides control
|
|
over which modules may be retrieved using an insecure scheme. Unlike the
|
|
<code>-insecure</code> flag, <code>GOINSECURE</code> does not disable module
|
|
sum validation using the checksum database. The <code>GOPRIVATE</code> or
|
|
<code>GONOSUMDB</code> environment variables may be used instead.
|
|
</p>
|
|
|
|
<h4 id="all-pattern">The <code>all</code> pattern</h4>
|
|
|
|
<p><!-- golang.org/cl/240623 -->
|
|
When the main module's <code>go.mod</code> file
|
|
declares <code>go</code> <code>1.16</code> or higher, the <code>all</code>
|
|
package pattern now matches only those packages that are transitively imported
|
|
by a package or test found in the main module. (Packages imported by <em>tests
|
|
of</em> packages imported by the main module are no longer included.) This is
|
|
the same set of packages retained
|
|
by <code>go</code> <code>mod</code> <code>vendor</code> since Go 1.11.
|
|
</p>
|
|
|
|
<h3 id="cgo">Cgo</h3>
|
|
|
|
<p> <!-- CL 252378 -->
|
|
The <a href="/cmd/cgo">cgo</a> tool will no longer try to translate
|
|
C struct bitfields into Go struct fields, even if their size can be
|
|
represented in Go. The order in which C bitfields appear in memory
|
|
is implementation dependent, so in some cases the cgo tool produced
|
|
results that were silently incorrect.
|
|
</p>
|
|
|
|
<p>
|
|
TODO
|
|
</p>
|
|
|
|
<h2 id="runtime">Runtime</h2>
|
|
|
|
<p>
|
|
TODO
|
|
</p>
|
|
|
|
<h2 id="compiler">Compiler</h2>
|
|
|
|
<p>
|
|
TODO
|
|
</p>
|
|
|
|
<h2 id="linker">Linker</h2>
|
|
|
|
<p>
|
|
This release includes additional improvements to the Go linker,
|
|
reducing linker resource usage (both time and memory) and improving
|
|
code robustness/maintainability. These changes form the second half
|
|
of a two-release project to
|
|
<a href="https://golang.org/s/better-linker">modernize the Go
|
|
linker</a>.
|
|
</p>
|
|
|
|
<p>
|
|
The linker changes in 1.16 extend the 1.15 improvements to all
|
|
supported architecture/OS combinations (the 1.15 performance improvements
|
|
were primarily focused on <code>ELF</code>-based OSes and
|
|
<code>amd64</code> architectures). For a representative set of
|
|
large Go programs, linking is 20-35% faster than 1.15 and requires
|
|
5-15% less memory on average for <code>linux/amd64</code>, with larger
|
|
improvements for other architectures and OSes.
|
|
</p>
|
|
|
|
<p>
|
|
TODO: update with final numbers later in the release.
|
|
</p>
|
|
|
|
<h2 id="library">Core library</h2>
|
|
|
|
<p>
|
|
TODO
|
|
</p>
|
|
|
|
<h3 id="net"><a href="/pkg/net/">net</a></h3>
|
|
|
|
<p><!-- CL 250357 -->
|
|
The case of I/O on a closed network connection, or I/O on a network
|
|
connection that is closed before any of the I/O completes, can now
|
|
be detected using the new <a href="/pkg/net/#ErrClosed">ErrClosed</a> error.
|
|
A typical use would be <code>errors.Is(err, net.ErrClosed)</code>.
|
|
In earlier releases the only way to reliably detect this case was to
|
|
match the string returned by the <code>Error</code> method
|
|
with <code>"use of closed network connection"</code>.
|
|
</p>
|
|
|
|
|
|
<h3 id="text/template/parse"><a href="/pkg/text/template/parse/">text/template/parse</a></h3>
|
|
|
|
<p><!-- CL 229398, golang.org/issue/34652 -->
|
|
A new <a href="/pkg/text/template/parse/#CommentNode"><code>CommentNode</code></a>
|
|
was added to the parse tree. The <a href="/pkg/text/template/parse/#Mode"><code>Mode</code></a>
|
|
field in the <code>parse.Tree</code> enables access to it.
|
|
</p>
|
|
<!-- text/template/parse -->
|
|
|
|
<h3 id="unicode"><a href="/pkg/unicode/">unicode</a></h3>
|
|
|
|
<p><!-- CL 248765 -->
|
|
The <a href="/pkg/unicode/"><code>unicode</code></a> package and associated
|
|
support throughout the system has been upgraded from Unicode 12.0.0 to
|
|
<a href="https://www.unicode.org/versions/Unicode13.0.0/">Unicode 13.0.0</a>,
|
|
which adds 5,930 new characters, including four new scripts, and 55 new emoji.
|
|
Unicode 13.0.0 also designates plane 3 (U+30000-U+3FFFF) as the tertiary
|
|
ideographic plane.
|
|
</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.
|
|
</p>
|
|
|
|
<p>
|
|
TODO
|
|
</p>
|
|
|
|
<dl id="net/http"><dt><a href="/pkg/net/http/">net/http</a></dt>
|
|
<dd>
|
|
<p><!-- CL 233637 -->
|
|
In the <a href="/pkg/net/http/"><code>net/http</code></a> package, the
|
|
behavior of <a href="/pkg/net/http/#StripPrefix"><code>StripPrefix</code></a>
|
|
has been changed to strip the prefix from the request URL's
|
|
<code>RawPath</code> field in addition to its <code>Path</code> field.
|
|
In past releases, only the <code>Path</code> field was trimmed, and so if the
|
|
request URL contained any escaped characters the URL would be modified to
|
|
have mismatched <code>Path</code> and <code>RawPath</code> fields.
|
|
In Go 1.16, <code>StripPrefix</code> trims both fields.
|
|
If there are escaped characters in the prefix part of the request URL the
|
|
handler serves a 404 instead of its previous behavior of invoking the
|
|
underlying handler with a mismatched <code>Path</code>/<code>RawPath</code> pair.
|
|
</p>
|
|
|
|
<p><!-- CL 252497 -->
|
|
The <a href="/pkg/net/http/"><code>net/http</code></a> package now rejects HTTP range requests
|
|
of the form <code>"Range": "bytes=--N"</code> where <code>"-N"</code> is a negative suffix length, for
|
|
example <code>"Range": "bytes=--2"</code>. It now replies with a <code>416 "Range Not Satisfiable"</code> response.
|
|
</p>
|
|
</dd>
|
|
</dl><!-- net/http -->
|