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spec: document that alias declarations can have type parameters with 1.24

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For #46477.

Change-Id: Id02d8f67fe82228bab3f26b1cb4ebd6ee67c4634
Reviewed-on: https://go-review.googlesource.com/c/go/+/616816
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Bypass: Robert Griesemer <gri@google.com>
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Robert Griesemer 2024-10-01 15:03:25 -07:00 committed by Gopher Robot
parent aa42d7b402
commit 630d4fb600
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doc/go_spec.html
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@ -2511,12 +2511,12 @@ An alias declaration binds an identifier to the given type
</p>
<pre class="ebnf">
AliasDecl = identifier "=" Type .
AliasDecl = identifier [ TypeParameters ] "=" Type .
</pre>
<p>
Within the <a href="#Declarations_and_scope">scope</a> of
the identifier, it serves as an <i>alias</i> for the type.
the identifier, it serves as an <i>alias</i> for the given type.
</p>
<pre>
@ -2526,6 +2526,24 @@ type (
)
</pre>
<p>
If the alias declaration specifies <a href="#Type_parameter_declarations">type parameters</a>
[<a href="#Go_1.24">Go 1.24</a>], the type name denotes a <i>generic alias</i>.
Generic aliases must be <a href="#Instantiations">instantiated</a> when they
are used.
</p>
<pre>
type set[P comparable] = map[P]bool
</pre>
<p>
In an alias declaration the given type cannot be a type parameter.
</p>
<pre>
type A[P any] = P // illegal: P is a type parameter
</pre>
<h4 id="Type_definitions">Type definitions</h4>
@ -8687,6 +8705,15 @@ integer values from zero to an upper limit.
function as range expression.
</li>
</ul>
<h4 id="Go_1.24">Go 1.24</h4>
<ul>
<li>
An <a href="#Alias_declarations">alias declaration</a> may declare
<a href="#Type_parameter_declarations">type parameters</a>.
</li>
</ul>
<h3 id="Type_unification_rules">Type unification rules</h3>
<p>