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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Ill-formed code?"
href="https://bugs.llvm.org/show_bug.cgi?id=37921">37921</a>
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<th>Summary</th>
<td>Ill-formed code?
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>zhonghao@pku.org.cn
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<pre>The code is as follow:
template<typename eT> class Mat;
template<typename eT> class Col : public Mat<eT> {
using Mat<eT>::operator();
using Col<eT>::operator();
void operator() ();
};
clang++ accepts it, but g++ rejects it:
error: type 'Col<eT>' is not a base type for type 'Col<eT>'
using Col<eT>::operator();
^
This code looks ill-formed, right?</pre>
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