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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Bogus reference bindings incorrectly accepted"
href="https://bugs.llvm.org/show_bug.cgi?id=44688">44688</a>
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<th>Summary</th>
<td>Bogus reference bindings incorrectly accepted
</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>Windows NT
</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>Casey@Carter.net
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Today's trunk and release/10.x accept the TU:
struct ExplicitToInt {
explicit operator int() const;
};
const int& x(ExplicitToInt{}); // #1
int&& y(ExplicitToInt{}); // #2
despite that GCC, MSVC, and I agree that both reference bindings are
ill-formed. Running quickly through the bullets in [dcl.init.ref]/5:
* 5.1 doesn't apply: the initializer is not an lvalue
* 5.2 doesn't apply: neither target reference is an lvalue reference to
non-const-qualified or volatile-qualified type
* 5.3.1 doesn't apply: Neither int nor const int is reference-compatible with
ExplicitToInt
* 5.3.2: doesn't apply, ***assuming that "can be converted" means "can be
implicitly converted"***
* 5.4: doesn't apply because the explicit conversion operator cannot be
selected for "copy-initialization of an object of type "cv1 T1" [const int and
int for #1 and #2 respectively] by user-defined conversion".</pre>
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</p>
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