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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang does not expect requires expression"
href="https://bugs.llvm.org/show_bug.cgi?id=47250">47250</a>
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<th>Summary</th>
<td>clang does not expect requires expression
</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>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>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>tangyixuan@mail.dlut.edu.cn
</td>
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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>
<div>
<pre>Compiling the following code with -std=c++2a, GCC accepts, while clang rejects.
Clang also rejects with -std=c++11/17.
$ cat s.C
template<class T>
bool f(T t) {
return requires(T t) {
++t;
};
}
int main() {
f(0);
return 0;
}
$ g++ -std=c++2a -c s.C
no errors.
$ clang++ std=c++2a -c s.C
s.C:3:19: error: 'T' does not refer to a value
return requires(T x) {
^
s.C:1:16: note: declared here
template<class T>
^
1 error generated.</pre>
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