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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Conversion to ambiguous/inaccessible rvalue base is valid in unevaluated context"
href="https://bugs.llvm.org/show_bug.cgi?id=37691">37691</a>
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<th>Summary</th>
<td>Conversion to ambiguous/inaccessible rvalue base is valid in unevaluated context
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>6.0
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>johelegp@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>In the following snippet, the assertions fail. See
<a href="https://godbolt.org/g/F2sZSR">https://godbolt.org/g/F2sZSR</a>.
```C++
#include <utility>
template <class To, class From>
constexpr bool is_static_castable(...)
{
return false;
};
template <
class To, class From,
class = decltype(static_cast<To>(std::declval<From>()))>
constexpr bool is_static_castable(int)
{
return true;
};
struct B {
};
struct D : B {
};
struct D2
: D
, B {
};
static_assert(!is_static_castable<B&&, D2>(0), "");
struct D3 : private B {
};
static_assert(!is_static_castable<B&&, D3>(0), "");
```</pre>
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