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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang++ incorrectly accepts "typename" in "using-declaration" without a nested-name-specifier"
href="http://llvm.org/bugs/show_bug.cgi?id=15362">15362</a>
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<th>Summary</th>
<td>clang++ incorrectly accepts "typename" in "using-declaration" without a nested-name-specifier
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.1
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>dinesh@dinsoft.net
</td>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>According to the C++11 standard, the production of the rule using-declaration
is:
using typename[opt] nested-name-specifier unqualified-id ;
using :: unqualified-id ;
But it seems that clang (3.1 at least) accepts also this syntax:
using typename :: unqualified-id ;
Which is not part of the standard.
The following little code illustrates this:
typedef int T;
namespace foo {
int T;
namespace bar {
using typename ::T; // < this should be rejected because of the presence of
'typename'
T a;
}
}</pre>
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