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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - requires{ member_fn; } within a member function is true, despite member_fn; being an error"
href="https://bugs.llvm.org/show_bug.cgi?id=51904">51904</a>
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<th>Summary</th>
<td>requires{ member_fn; } within a member function is true, despite member_fn; being an error
</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
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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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>nyanpasu64@tuta.io
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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>Created <span class=""><a href="attachment.cgi?id=25271" name="attach_25271" title="Test case for requires{} expressions">attachment 25271</a> <a href="attachment.cgi?id=25271&action=edit" title="Test case for requires{} expressions">[details]</a></span>
Test case for requires{} expressions
If I define a class with a `void member_fn()` which contains `requires{
member_fn; }`, it evaluates to true on Clang but is an error on GCC, despite
`member_fn;` being an error on both compilers.
If I define a `template<typename T> Class : T` instantiated with a `T`
containing `base_fn()`, and `Class` contains a member function with `requires{
T::base_fn; }`, it evaluates to true on Clang but false on GCC, despite
`base_fn;` being an error on both compilers.
Is this a Clang bug, or is my code ill-formed? I was using the value of
`requires{}` as an input to `if constexpr` or `static_assert`, rather than as a
concept or template bound; is this allowed?
I've attached a file testing whether `requires{}` in various positions is true,
false, or an error to evaluate.</pre>
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