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tweak grammar and associated prose to permit things like x.y in range clauses.
R=rsc DELTA=5 (3 added, 0 deleted, 2 changed) OCL=27536 CL=27540
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@ -3452,7 +3452,7 @@ of iteration variables - and then executes the block.
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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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RangeClause = IdentifierList ( "=" | ":=" ) "range" Expression .
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RangeClause = ExpressionList ( "=" | ":=" ) "range" Expression .
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</pre>
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</pre>
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<p>
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<p>
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@ -3460,7 +3460,10 @@ The type of the right-hand expression in the "range" clause must be an
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array, slice, string or map, or a pointer to an array, slice, string or map;
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array, slice, string or map, or a pointer to an array, slice, string or map;
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or it may be a channel.
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or it may be a channel.
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Except for channels,
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Except for channels,
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the identifier list must contain one or two identifiers denoting the
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the identifier list must contain one or two expressions
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(as in assignments, these must be a
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variable, pointer indirection, field selector, or index expression)
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denoting the
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iteration variables. On each iteration,
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iteration variables. On each iteration,
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the first variable is set to the string, array or slice index or
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the first variable is set to the string, array or slice index or
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map key, and the second variable, if present, is set to the corresponding
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map key, and the second variable, if present, is set to the corresponding
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