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spec: clarify when a range expression is evaluated
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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<!--{
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"Title": "The Go Programming Language Specification",
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"Subtitle": "Language version go1.22 (Feb 6, 2024)",
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"Subtitle": "Language version go1.22 (April 24, 2024)",
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"Path": "/ref/spec"
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}-->
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@ -6644,8 +6644,8 @@ the range clause is equivalent to the same clause without that identifier.
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<p>
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The range expression <code>x</code> is evaluated once before beginning the loop,
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with one exception: if at most one iteration variable is present and
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<code>len(x)</code> is <a href="#Length_and_capacity">constant</a>,
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with one exception: if at most one iteration variable is present and <code>x</code> or
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<a href="#Length_and_capacity"><code>len(x)</code></a> is <a href="#Constants">constant</a>,
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the range expression is not evaluated.
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</p>
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