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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - compiler crashes without proper diagnostics upon bad recursive variadic template usage"
href="https://bugs.llvm.org/show_bug.cgi?id=47452">47452</a>
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<th>Summary</th>
<td>compiler crashes without proper diagnostics upon bad recursive variadic template usage
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>kirshamir@gmail.com
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>template<std::size_t INDEX, typename... Ts>
struct A;
template<std::size_t INDEX, typename T>
class A<INDEX, T> {
T t;
public:
template<typename U, typename = std::enable_if_t<std::is_constructible_v<T,
U>>>
constexpr A(U&& u)
: t{std::forward<U>(u)} {}
};
template<std::size_t INDEX, typename T, typename... Ts>
struct A<INDEX, T, Ts...>: A<INDEX+1, Ts...>, A<INDEX, T> {
template<typename U, typename... Us>
constexpr A(U&& u, Us&&... us) noexcept(noexcept(A<INDEX+1, T,
Ts...>{std::forward<U>(u), std::forward<Us>(us)...}))
: A<INDEX+1, Ts...>{std::forward<Us>(us)...}, A<INDEX,
T>{std::forward<U>(u)} {}
};
int main() {
A<0,int> a1{3};
A<0,int,int> a2{3, 3};
}
---------
The noexcept expression on the ctor of struct A<INDEX, T, Ts...> is recursively
using the same method.
Compiler crashes without proper diagnostics.
Code: <a href="https://godbolt.org/z/KcbT13">https://godbolt.org/z/KcbT13</a></pre>
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