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doc: emphasize gotypesalias GODEBUG flag in go 1.22 release notes

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Per discussion with rfindley.

Change-Id: Ia1cff05aff724eb8c919ffcc1fac121ca017efe9
Reviewed-on: https://go-review.googlesource.com/c/go/+/549056
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Bypass: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
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Robert Griesemer 2023-12-11 18:22:59 -08:00 committed by Robert Griesemer
parent 018c1da0cf
commit 7baaa20e38
1 changed files with 6 additions and 2 deletions
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@ -503,18 +503,22 @@ defer func() {
The new <a href="/pkg/go/types#Alias"><code>Alias</code></a> type represents type aliases.
Previously, type aliases were not represented explicitly, so a reference to a type alias was equivalent
to spelling out the aliased type, and the name of the alias was lost.
The new representation retains the intermediate Alias.
This enables improved error reporting (the name of an alias can be reported), and allows for better handling
The new representation retains the intermediate <code>Alias</code>.
This enables improved error reporting (the name of a type alias can be reported), and allows for better handling
of cyclic type declarations involving type aliases.
In a future release, <code>Alias</code> types will also carry <a href="https://go.dev/issue/46477">type parameter information</a>.
The new function <a href="/pkg/go/types#Unalias"><code>Unalias</code></a> returns the actual type denoted by an
<code>Alias</code> type (or any other <a href="/pkg/go/types#Type"><code>Type</code></a> for that matter).
</p>
<p>
Because <code>Alias</code> types may break existing type switches that do not know to check for them,
this functionality is controlled by a <a href="/doc/godebug"><code>GODEBUG</code></a> field named <code>gotypesalias</code>.
With <code>gotypesalias=0</code>, everything behaves as before, and <code>Alias</code> types are never created.
With <code>gotypesalias=1</code>, <code>Alias</code> types are created and clients must expect them.
The default is <code>gotypesalias=0</code>.
In a future release, the default will be changed to <code>gotypesalias=1</code>.
<em>Clients of <a href="/pkg/go/types"><code>go/types</code></a> are urged to adjust their code as soon as possible
to work with <code>gotypesalias=1</code> to eliminate problems early.</em>
</p>
<p><!-- https://go.dev/issue/62605, CL 540056 -->