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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 --- - Compiler accepting ill-formed program trying to define a struct via using-declaration" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24138&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=5fSaITeU_wE4Dj-3XHaH0TkUo_OLFTn_SFz_82Ixhp8&s=qPF3_ZGORaGqLBjBUpVVicAcUHdJtUJ-gX4Sy4K8jFY&e=">24138</a>
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<th>Summary</th>
<td>Compiler accepting ill-formed program trying to define a struct via using-declaration
</td>
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<th>Product</th>
<td>clang
</td>
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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>
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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>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider the following program:
namespace R {
struct f;
}
namespace S {
using R::f;
}
struct S::f {};
int main() {}
But clang compiles it without any error messages. The expected behaviour is to
get an error message.
The program is ill-formed by the following clauses in the c++ standard:
* [class]p11 ( <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__eel.is_c-2B-2Bdraft_class-2311&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=5fSaITeU_wE4Dj-3XHaH0TkUo_OLFTn_SFz_82Ixhp8&s=JOlAyOPrk7Z76HpX-5zOyA90jGMLww7xJ7fjmo4Ei7E&e=">http://eel.is/c++draft/class#11</a> ):
Note especially the sentence "i.e., not merely inherited or introduced by a
using-declaration"
* [dcl.meaning]p1 ( <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__eel.is_c-2B-2Bdraft_dcl.meaning-231&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=5fSaITeU_wE4Dj-3XHaH0TkUo_OLFTn_SFz_82Ixhp8&s=hC3RfHkdnbH9NdiP9Mc6G-5pN_CvluRmYt2mkPKSNY8&e=">http://eel.is/c++draft/dcl.meaning#1</a> ):
Not especially the sentence "the member shall not merely have been introduced
by a using-declaration in the scope of the class or namespace nominated by the
nested-name-specifier of the declarator-id."</pre>
</div>
</p>
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