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go/doc/go1.21.html
Austin Clements 9eba17ff90 runtime: for deep stacks, print both the top 50 and bottom 50 frames
This is relatively easy using the new traceback iterator.

Ancestor tracebacks are now limited to 50 frames. We could keep that
at 100, but the fact that it used 100 before seemed arbitrary and
unnecessary.

Fixes #7181
Updates #54466

Change-Id: If693045881d84848f17e568df275a5105b6f1cb0
Reviewed-on: https://go-review.googlesource.com/c/go/+/475960
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
2023-03-21 19:14:14 +00:00

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<!--{
"Title": "Go 1.21 Release Notes",
"Path": "/doc/go1.21"
}-->
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<style>
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</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>
TODO: complete this section
</p>
<h2 id="ports">Ports</h2>
<p>
TODO: complete this section, or delete if not needed
</p>
<h2 id="tools">Tools</h2>
<h3 id="go-command">Go command</h3>
<p>
TODO: complete this section, or delete if not needed
</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>
<h2 id="compiler">Compiler</h2>
<p>
TODO: complete this section, or delete if not needed
</p>
<h2 id="linker">Linker</h2>
<p>
TODO: complete this section, or delete if not needed
</p>
<h2 id="library">Core library</h2>
<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>
TODO: complete this section
</p>