https://bugs.llvm.org/show_bug.cgi?id=49586
Bug ID: 49586
Summary: Regression where LValue Ref gets incorrectly reported
as an RValue Ref
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: release blocker
Priority: P
Component: C++2a
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Minimal reproducer showing regression from clang 11.0.1 to trunk:
https://godbolt.org/z/a8z8b8
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.
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