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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Regression where LValue Ref gets incorrectly reported as an RValue Ref"
href="https://bugs.llvm.org/show_bug.cgi?id=49586">49586</a>
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<th>Summary</th>
<td>Regression where LValue Ref gets incorrectly reported as an RValue Ref
</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>release blocker
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++2a
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>dpsicilia@gmail.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>Minimal reproducer showing regression from clang 11.0.1 to trunk:
<a href="https://godbolt.org/z/a8z8b8">https://godbolt.org/z/a8z8b8</a>
Flags: -std=c++20 -stdlib=libc++
===========================================
#include <type_traits>
struct O {
template<typename U>
O( U&& u ) {
static_assert( std::is_lvalue_reference<U>::value );
}
};
struct A {};
A a;
O make_o() {
A& a_ref = a;
return a_ref;
}
===========================================
In clang 11.0.1 the static_assert passes, but on trunk it fails. I tried also
changing the static_assert to this:
static_assert( std::is_lvalue_reference<decltype(std::forward<U>(u))>::value );
but same behavior. Also, this seems to only happen in C++20 mode.</pre>
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