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doc/go1.21: document clear builtin and init order changes

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Also move all the language changes to the same part of the release notes.

For #56351
For #57411

Change-Id: Id1c51b5eb8f7d85e61a2ae44ee7d73bb13036631
Reviewed-on: https://go-review.googlesource.com/c/go/+/498755
TryBot-Bypass: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
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Ian Lance Taylor 2023-05-26 14:04:37 -07:00 committed by Gopher Robot
parent 3824d3d71e
commit ccc42b0f91
1 changed files with 46 additions and 22 deletions
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doc/go1.21.html
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@ -25,13 +25,53 @@ Do not send CLs removing the interior tags from such phrases.
<h2 id="language">Changes to the language</h2>
<!-- https://go.dev/issue/59488 -->
<p>
Go 1.21 adds two new built-ins to the language:
the new functions <code>min</code> and <code>max</code> compute the
smallest (or largest, for <code>max</code>) value of a fixed number
of given arguments.
See the language spec for <a href="https://tip.golang.org/ref/spec#Min_and_max">details</a>.
Go 1.21 adds three new built-ins to the language.
<ul>
<li><!-- https://go.dev/issue/59488 -->
The new functions <code>min</code> and <code>max</code> compute the
smallest (or largest, for <code>max</code>) value of a fixed number
of given arguments.
See the language spec for
<a href="https://tip.golang.org/ref/spec#Min_and_max">details</a>.
</li>
<li><!-- https://go.dev/issue/56351 -->
The new function <code>clear</code> deletes all elements from a
map or zeroes all elements of a slice.
See the language spec for
<a href="https://tip.golang.org/ref/spec#Clear">details</a>.
</li>
</ul>
</p>
<p><!-- https://go.dev/issue/57411 -->
Package initialization order is now specified more precisely. The
new algorithm is:
<ul>
<li>
Sort all packages by import path.
</li>
<li>Repeat until the list of packages is empty:
<ul>
<li>
Find the first package in the list for which all imports are
already initialized.
</li>
<li>
Initialize that package and remove it from the list.
</li>
</ul>
</li>
</ul>
This may change the behavior of some programs that rely on a
specific initialization ordering that was not expressed by explicit
imports. The behavior of such programs was not well defined by the
spec in past releases. The new rule provides an unambiguous definition.
</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>
<p><!-- https://go.dev/issue/56986 -->
@ -745,22 +785,6 @@ Do not send CLs removing the interior tags from such phrases.
</dd>
</dl><!-- runtime/metrics -->
<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="sync"><dt><a href="/pkg/sync/">sync</a></dt>
<dd>
<p><!-- https://go.dev/issue/56102, CL 451356 -->