[Bug c++/100039] New: GCC can not bind lvalue to lvalue reference in brace-initialized-temporary expression

[vanyacpp at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100039

            Bug ID: 100039
           Summary: GCC can not bind lvalue to lvalue reference in
                    brace-initialized-temporary expression
           Product: gcc
           Version: 10.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vanyacpp at gmail dot com
  Target Milestone: ---

Consider this program:

typedef int& ref;

int main()
{
    int a;
    ref{a};
}

This is accepted by clang, msvc and icc. GCC 10.3 rejects this code with a
message:

error: cannot bind non-const lvalue reference of type 'ref' {aka 'int&'} to an
rvalue of type 'int'

I believe the error message is incorrect, because "a" is not an rvalue here. It
is lvalue, therefore it should be allowed to bind to lvalue reference.

https://godbolt.org/z/TWY9GPq3E