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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - non-bool expression allowed in requires clause"
href="https://bugs.llvm.org/show_bug.cgi?id=45219">45219</a>
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<th>Summary</th>
<td>non-bool expression allowed in requires clause
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>10.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>akrzemi1@gmail.com
</td>
</tr>
<tr>
<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>Clang trunk compiles the following invalid C++20 code.
```
#include <string>
#include <iostream>
template <typename T>
requires T::operator int
std::string fun(T) { std::cout << 1; }
template <typename T>
void fun(T) { std::cout << 0; }
int main()
{
fun(1); // expected hard compiler error
}
```
It should not compile because expression `T::operator int` does not have type
bool.</pre>
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