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go spec clarification: arrays must be addressable to be sliceable
R=rsc CC=golang-dev, r https://golang.org/cl/2141041
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<!-- title The Go Programming Language Specification -->
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<!-- subtitle Version of Sep 1, 2010 -->
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<!-- subtitle Version of Sep 2, 2010 -->
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<!--
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TODO
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@ -2464,8 +2464,8 @@ for slices, the upper bound is the capacity rather than the length.
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<p>
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If the sliced operand is a string or slice, the result of the slice operation
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is a string or slice of the same type.
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If the sliced operand is an array, the result of the slice operation is a slice
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with the same element type as the array.
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If the sliced operand is an array, it must be <a href="#Address_operators">addressable</a>
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and the result of the slice operation is a slice with the same element type as the array.
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</p>
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