[llvm-bugs] [Bug 31513] New: <tuple> header prevents valid code from compiling

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31513

            Bug ID: 31513
           Summary: <tuple> header prevents valid code from compiling
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: matt at godbolt.org
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

(reported on behalf of Bjorn Fahller; he cannot get a new account created).

The following (believed to be correct) code fails to compile with svn rev
290809 with `-std=c++1z -stdlib=libc++` :

--
#include <tuple>
struct S { int s; };

int main()
{
  S const s{99};
  auto& [p] = s;
  return p;
}
--

Quoting Bjorn:

"The above program fails on a home built clang+libc++ at svn rev 290809 when
compiled with '-std=c++1z -stdlib=libc++'
To make it compile, comment out the '#include' line.
I believe the bug is in libstdc++ rather than in clang++ itself.
It's very similar to, but not identical with,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78939
Strictly speaking, neither `const` nor `&` capture is needed to expose the
problem, but since it *does* make a difference in the gcc libstdc++-case, I
choose to include it."

Bjorn emailed a while back asking for a login to report it himself.

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