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<body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - defined template friend is 'sometimes' not defined - std::experimental::any"
href="https://llvm.org/bugs/show_bug.cgi?id=27544">bug 27544</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>richard-llvm@metafoo.co.uk
</td>
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<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - defined template friend is 'sometimes' not defined - std::experimental::any"
href="https://llvm.org/bugs/show_bug.cgi?id=27544#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - defined template friend is 'sometimes' not defined - std::experimental::any"
href="https://llvm.org/bugs/show_bug.cgi?id=27544">bug 27544</a>
from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
<pre>This code is ill-formed.
In order for 'gun<T>' to be parsed as a template-id, there must be a
declaration of a template named 'gun' visible to name lookup, and there is not.
The problem is that GCC's name lookup has a bug where it incorrectly injects
friend function templates into the surrounding scope. Try this:
struct bar {
friend void f(int) {}
template<typename T> friend void g(T) {}
};
int main() {
f(0);
g(0);
}
All versions of GCC that I tested reject the call to 'f'.
Versions of GCC prior to 5.0 incorrectly accept the call to 'g'.
GCC 5.x rejects the call to 'g' but produces a bogus typo correction from 'g'
to 'g'. Whatever it's still getting wrong here leads to it accepting your
original testcase.
GCC 6.x properly rejects both calls and your original testcase.</pre>
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