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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Out of line definition mismatch due to incorrect type equivalence check"
href="https://bugs.llvm.org/show_bug.cgi?id=50712">50712</a>
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<th>Summary</th>
<td>Out of line definition mismatch due to incorrect type equivalence check
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>12.0
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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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>nvlb@tutanota.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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<pre>When declaring a class A's constructor constrained to check for type
equivalence of the underlying value_type of a passed-in iterator with an
in-class defined nested struct B, the out of line definition of this
constructor does not match the function declaration in class using same_as<>
concept, with both A and B being templated.
A more detailed description is on stackoverflow.
<a href="https://stackoverflow.com/questions/67965118/c-concepts-sfinae-clang-and-msvc-g-different-results-for-out-of-line-functi">https://stackoverflow.com/questions/67965118/c-concepts-sfinae-clang-and-msvc-g-different-results-for-out-of-line-functi</a>
A brief test case is provided at <a href="https://godbolt.org/z/fdqEYxKh8">https://godbolt.org/z/fdqEYxKh8</a>.</pre>
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