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doc/go1.20: document new semantics for comparable constraint 

For #54202.
For #56548.

Change-Id: If2b9e41813c3e1c8d373469a40e1bd0bd5ea2b16
Reviewed-on: https://go-review.googlesource.com/c/go/+/454595
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Bypass: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
This commit is contained in:
Robert Griesemer 2022-12-01 12:36:51 -08:00 committed by Robert Griesemer
parent 8ed74ee39a
commit cc1771e2fd
1 changed files with 10 additions and 1 deletions
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@ -26,7 +26,7 @@ Do not send CLs removing the interior tags from such phrases.
<h2 id="language">Changes to the language</h2> <h2 id="language">Changes to the language</h2>
<p> <p>
Go 1.20 includes three changes to the language. Go 1.20 includes four changes to the language.
</p> </p>
<p><!-- https://go.dev/issue/46505 --> <p><!-- https://go.dev/issue/46505 -->
@ -56,6 +56,15 @@ Do not send CLs removing the interior tags from such phrases.
what the implementations have always done. what the implementations have always done.
</p> </p>
<p><!-- https://go.dev/issue/56548 -->
<a href="/ref/spec#Comparison_operators">Comparable types</a> (such as ordinary interfaces)
may now satisfy <code>comparable</code> constraints, even if the type arguments
are not strictly comparable (comparison may panic at runtime).
This makes it possible to instantiate a type parameter constrained by <code>comparable</code>
(e.g., a type parameter for a user-defined generic map key) with a non-strictly comparable type argument
such as an interface type, or a composite type containing an interface type.
</p>
<h2 id="ports">Ports</h2> <h2 id="ports">Ports</h2>
<h3 id="freebsd-riscv">FreeBSD/RISC-V</h3> <h3 id="freebsd-riscv">FreeBSD/RISC-V</h3>