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spec: clarify meaning of x op= y
Suggested by mdempsky (see also issue #11161). Change-Id: I1ab28febe19b7a092029499015073ce8749b4d99 Reviewed-on: https://go-review.googlesource.com/10960 Reviewed-by: Ian Lance Taylor <iant@golang.org>
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@ -1,6 +1,6 @@
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<!--{
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<!--{
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"Title": "The Go Programming Language Specification",
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"Title": "The Go Programming Language Specification",
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"Subtitle": "Version of May 26, 2015",
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"Subtitle": "Version of June 11, 2015",
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"Path": "/ref/spec"
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"Path": "/ref/spec"
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}-->
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}-->
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@ -4388,7 +4388,7 @@ a[i] = 23
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An <i>assignment operation</i> <code>x</code> <i>op</i><code>=</code>
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An <i>assignment operation</i> <code>x</code> <i>op</i><code>=</code>
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<code>y</code> where <i>op</i> is a binary arithmetic operation is equivalent
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<code>y</code> where <i>op</i> is a binary arithmetic operation is equivalent
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to <code>x</code> <code>=</code> <code>x</code> <i>op</i>
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to <code>x</code> <code>=</code> <code>x</code> <i>op</i>
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<code>y</code> but evaluates <code>x</code>
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<code>(y)</code> but evaluates <code>x</code>
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only once. The <i>op</i><code>=</code> construct is a single token.
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only once. The <i>op</i><code>=</code> construct is a single token.
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In assignment operations, both the left- and right-hand expression lists
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In assignment operations, both the left- and right-hand expression lists
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must contain exactly one single-valued expression, and the left-hand
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must contain exactly one single-valued expression, and the left-hand
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