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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang rejects definition of iterator in -std=c++2a"
href="https://bugs.llvm.org/show_bug.cgi?id=47814">47814</a>
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<th>Summary</th>
<td>clang rejects definition of iterator in -std=c++2a
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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>PC
</td>
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<th>OS</th>
<td>Linux
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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++2a
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>tangyixuan@mail.dlut.edu.cn
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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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<pre>Hi, the following code definition of iterator 'a' of struct 'S2'. Although it
is invalid use of 'S2' in ISO C++17 and before, maybe it is valid in C++20 and
gcc also accepts it with -std=c++20.
$ s.cpp
template < class T > struct S1 {};
template < class T > struct S2 {
friend class :: S1 < T >;
S2 <T>::iterator a;
};
$ clang++ -c -std=c++20 s.cpp
s.cpp:4:17: error: no type named 'iterator' in 'S2<T>'
S2 <T>::iterator a;
~~~~~~~~^
1 error generated.</pre>
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