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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 --- - Class declaration in the same declarative region as using declaration - Missing diagnostic message" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24030&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=h40z5INiN8KkLPB95Lxbkhlymer2S_qSSSw1VSLYqUU&s=RjjWpQk7H0XfWKx4kJuVSytqtBE64Jd2YDqrDdGgoRA&e=">24030</a>
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<th>Summary</th>
<td>Class declaration in the same declarative region as using declaration - Missing diagnostic message
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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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>anders.granlund.0@gmail.com
</td>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following program should give a diagnostic message when trying to compile
it.
namespace X { class A; }
namespace Y { using X::A; class A {}; }
int main() {}
This is because it violates [basic.scope.declarative]/4 in the c++ standard:
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__eel.is_c-2B-2Bdraft_basic.scope.declarative-234&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=h40z5INiN8KkLPB95Lxbkhlymer2S_qSSSw1VSLYqUU&s=EiAmITvVBgwkyY5LiRNPSesARwQel_W-Qs6GAQT7A_Q&e=">http://eel.is/c++draft/basic.scope.declarative#4</a>
The diagnostic message is missing. MSVS gives a diagnostic message for this
program, but clang does not.
Stack overflow post confirming the bug:
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__stackoverflow.com_questions_31220154_class-2Ddeclaration-2Din-2Dsame-2Dscope-2Das-2Dusing-2Ddeclaration-2Dcompiles-2Din-2Dgcc-2Dbut-2Dnot-2Dmsv&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=h40z5INiN8KkLPB95Lxbkhlymer2S_qSSSw1VSLYqUU&s=p5B7u4yOaOKOjLp-ocZnjefHkHyWg9pj4txI11y5f3I&e=">http://stackoverflow.com/questions/31220154/class-declaration-in-same-scope-as-using-declaration-compiles-in-gcc-but-not-msv</a></pre>
</div>
</p>
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