[llvm-bugs] [Bug 34515] New: std::indirect_array::operator= gives wrong result.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34515

            Bug ID: 34515
           Summary: std::indirect_array::operator= gives wrong result.
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: pichet2000 at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

#include "iostream"
#include <valarray>

int main()  {
  int input[] = { 0, 1, 2, 3, 4, 5, 6 };
  std::valarray<int>            filled(input, 7);

  size_t indexes[] = { 1, 3, 4, 6 };
  std::valarray<size_t> index(indexes, 4);
  size_t indexes2[] = { 1, 2, 3, 4 };
  std::valarray<size_t> index2(indexes2, 4);

  const std::indirect_array<int> result = filled[index];
  const std::indirect_array<int> result2 = filled[index2];
  result = result2;

  std::valarray<int> temp(result);
  for (int i = 0; i < temp.size(); i++)
    std::cout << temp[i] << " ";
}

using clang, this will print:
1 2 2 2


using msvc or gcc, this will print:
1 2 3 4

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