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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - An example code from the standard (templates and concepts) does not compile"
href="https://bugs.llvm.org/show_bug.cgi?id=50864">50864</a>
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<th>Summary</th>
<td>An example code from the standard (templates and concepts) does not compile
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</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
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++2a
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>mikhail.matrosov@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>According to [temp.constr.decl]/4 the following example should compile:
template <class T> concept C = true;
template <class T> struct A {
template <class U> U f(U) requires C<typename T::type>; // #1
template <class U> U f(U) requires C<T>; // #2
};
template <> template <class U>
U A<int>::f(U u) requires C<int> { return u; } // OK, specializes
#2
However, clang gives an error:
<source>:3:49: error: type 'int' cannot be used prior to '::' because it has no
members
template <class U> U f(U) requires C<typename T::type>; // #1
^
I believe this is the reason why clang cannot compile libstdc++ ranges:
<a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang can't compile libstdc++ ranges"
href="show_bug.cgi?id=46746">https://bugs.llvm.org/show_bug.cgi?id=46746</a></pre>
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