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go spec: clarify return type of append, argument type for ...T parameters
R=iant, ken2, r, rsc CC=golang-dev https://golang.org/cl/2774041
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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 Oct 26, 2010 -->
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<!-- subtitle Version of Oct 27, 2010 -->
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<!--
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<!--
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TODO
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TODO
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@ -2639,9 +2639,9 @@ within <code>Greeting</code>, <code>who</code> will have the value
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</p>
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</p>
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<p>
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<p>
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If the final argument is of slice type <code>[]T</code>, it may be passed unchanged as the value
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If the final argument is assignable to a slice type <code>[]T</code>, it may be
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for a <code>...T</code> parameter if the argument is followed by <code>...</code>.
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passed unchanged as the value for a <code>...T</code> parameter if the argument
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In this case no new slice is created.
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is followed by <code>...</code>. In this case no new slice is created.
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</p>
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</p>
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<p>
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<p>
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@ -4535,12 +4535,13 @@ Two built-in functions assist in common slice operations.
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<p>
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<p>
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The function <code>append</code> appends zero or more values <code>x</code>
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The function <code>append</code> appends zero or more values <code>x</code>
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to a slice <code>s</code> and returns the resulting slice. Each value must be
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to a slice <code>s</code> and returns the resulting slice, with the same type
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<a href="#Assignability">assignable</a> to the slice's element type.
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as s. Each value must be <a href="#Assignability">assignable</a> to the slice's
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element type.
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</p>
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</p>
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<pre class="grammar">
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<pre class="grammar">
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append(s []T, x ...T) []T
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append(s S, x ...T) S // S is assignable to []T
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</pre>
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</pre>
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<p>
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<p>
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