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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Bogus -Winvalid-partial-specialization when specialization has `const auto&` NTTP parameter"
href="https://bugs.llvm.org/show_bug.cgi?id=47692">47692</a>
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<th>Summary</th>
<td>Bogus -Winvalid-partial-specialization when specialization has `const auto&` NTTP parameter
</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>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>arthur.j.odwyer@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>// <a href="https://godbolt.org/z/b7W4TY">https://godbolt.org/z/b7W4TY</a>
template<auto&> struct A { int i = 1; };
template<const auto& X> struct A<X> { int i = 2; };
====
<source>:2:32: error: class template partial specialization is not more
specialized than the primary template [-Winvalid-partial-specialization]
template<const auto& X> struct A<X> { int i = 2; };
^
<source>:1:24: note: template is declared here
template<auto&> struct A { int i = 1; };
^
1 error generated.
====
GCC and MSVC both accept this code, and do generate `A<i>` from the partial
specialization whenever `i` is a const variable.</pre>
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