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spec: disallow general func, map comparisons
R=golang-dev, gri, r, r CC=golang-dev https://golang.org/cl/5369090
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@ -1,5 +1,5 @@
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<!-- title The Go Programming Language Specification -->
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<!-- subtitle Version of November 9, 2011 -->
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<!-- subtitle Version of November 13, 2011 -->
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<!--
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TODO
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@ -2966,14 +2966,10 @@ and string values. The result of a comparison is defined as follows:
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or if both are <code>nil</code>.
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</li>
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<li>
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Function values are equal if they refer to the same function
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or if both are <code>nil</code>.
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A slice, map, or function value may be compared only to <code>nil</code>.
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</li>
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<li>
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A slice value may only be compared to <code>nil</code>.
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</li>
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<li>
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Channel and map values are equal if they were created by the same call to <code>make</code>
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Channel values are equal if they were created by the same call to <code>make</code>
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(§<a href="#Making_slices_maps_and_channels">Making slices, maps, and channels</a>)
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or if both are <code>nil</code>.
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</li>
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