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spec: clarify when a range expression is evaluated

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If the range expression is a numeric constant, the
range expression is also not evaluated.

Change-Id: I97201e5c136d3d1a87ed1500b19b7199b30bc9ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/581298
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Bypass: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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Robert Griesemer 2024-04-23 17:30:02 -07:00 committed by Gopher Robot
parent 4351af68eb
commit db5f2b4153
1 changed files with 3 additions and 3 deletions
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6
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Language version go1.22 (Feb 6, 2024)",
"Subtitle": "Language version go1.22 (April 24, 2024)",
"Path": "/ref/spec"
}-->
@ -6644,8 +6644,8 @@ the range clause is equivalent to the same clause without that identifier.
<p>
The range expression <code>x</code> is evaluated once before beginning the loop,
with one exception: if at most one iteration variable is present and
<code>len(x)</code> is <a href="#Length_and_capacity">constant</a>,
with one exception: if at most one iteration variable is present and <code>x</code> or
<a href="#Length_and_capacity"><code>len(x)</code></a> is <a href="#Constants">constant</a>,
the range expression is not evaluated.
</p>