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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - name lookup in qualified friend declaration is extremely suspicious"
href="https://bugs.llvm.org/show_bug.cgi?id=38882">38882</a>
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<th>Summary</th>
<td>name lookup in qualified friend declaration is extremely suspicious
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>5.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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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
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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>richard-llvm@metafoo.co.uk
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</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
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<pre>Testcase:
using T = int;
namespace N {
struct X {
template<typename T> void f(T);
};
template<typename> struct Y {
template<typename T> friend void X::f(T); // #1
friend void X::f<>(Y); // #2
};
}
Here, #1 resolves T as ::T, not as the template parameter. Strangely, we fail
to diagnose this, and instead silently befriend nothing in line #1.
In #2, Y resolves to N::Y, not to the injected-class-name of N::Y, and as a
result declaration #2 is rejected because Y is lacking its template arguments.
These results both seem extremely surprising. The standard's rules here are
highly unclear, but this cannot be the right behavior...</pre>
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