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go spec: for map types, mention indexing operations
(like we do for arrays and slices). Suggested by mathieu.lonjaret@gmail.com . R=r, rsc, iant CC=golang-dev https://golang.org/cl/4442074
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<!-- title The Go Programming Language Specification -->
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<!-- subtitle Version of Apr 19, 2011 -->
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<!-- subtitle Version of Apr 22, 2011 -->
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<!--
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TODO
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@ -1155,8 +1155,9 @@ map [string] interface {}
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The number of map elements is called its length.
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For a map <code>m</code>, it can be discovered using the
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built-in function <a href="#Length_and_capacity"><code>len(m)</code></a>
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and may change during execution. Values may be added and removed
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during execution using special forms of <a href="#Assignments">assignment</a>.
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and may change during execution. Elements may be added and removed
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during execution using special forms of <a href="#Assignments">assignment</a>;
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and they may be accessed with <a href="#Indexes">index</a> expressions.
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</p>
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<p>
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A new, empty map value is made using the built-in
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