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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - inline namespace template ambiguities not well diagnosed"
href="https://llvm.org/bugs/show_bug.cgi?id=31660">31660</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>inline namespace template ambiguities not well diagnosed
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>4.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++14
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hfinkel@anl.gov
</td>
</tr>
<tr>
<th>CC</th>
<td>eric@efcs.ca, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Given this code:
$ cat /tmp/t6.cpp
namespace ns {
inline namespace in {
template <class T>
class foo { };
}
}
namespace ns {
template <class T>
class foo { };
}
using namespace ns;
foo<int> x;
We produce only this error:
$ clang -stdlib=libc++ -fsyntax-only /tmp/t6.cpp -std=c++14
/tmp/t6.cpp:14:1: error: unknown type name 'foo'
foo<int> x;
^
/tmp/t6.cpp:14:4: error: expected unqualified-id
foo<int> x;
^
2 errors generated.
This is really confusing. The problem, I can only suppose, is that the lookup
is ambiguous, but we don't say that (and, thus, we fail to point out the
relevant candidates).
If foo were not a template, like this:
$ cat /tmp/t7.cpp
namespace ns {
inline namespace in {
class foo { };
}
}
namespace ns {
class foo { };
}
using namespace ns;
foo x;
then we produce a very sensible error:
$ clang -stdlib=libc++ -fsyntax-only /tmp/t7.cpp -std=c++14
/tmp/t7.cpp:12:1: error: reference to 'foo' is ambiguous
foo x;
^
/tmp/t7.cpp:3:7: note: candidate found by name lookup is 'ns::in::foo'
class foo { };
^
/tmp/t7.cpp:8:7: note: candidate found by name lookup is 'ns::foo'
class foo { };
^
1 error generated.
Can we do better in the template case?</pre>
</div>
</p>
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