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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Recursive concept leads to compiler ICE."
href="https://bugs.llvm.org/show_bug.cgi?id=39192">39192</a>
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<th>Summary</th>
<td>Recursive concept leads to compiler ICE.
</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++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>brycelelbach@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Defining a concept that recursively uses itself leads to a compiler ICE with
the experimental Clang concepts branch.
<a href="https://godbolt.org/z/4vRxyS">https://godbolt.org/z/4vRxyS</a>
A repro is as follows:
template <typename T>
struct deferred_X;
template <typename T>
concept X = deferred_X<T>::template value<T>;
template <typename T>
struct deferred_X {
template <X U>
static constexpr bool value = true;
};
template <X> struct A{};
A<int> a;</pre>
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