[llvm-bugs] [Bug 36241] New: Unused index call of zero-sized array with libcxx causes compile error

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https://bugs.llvm.org/show_bug.cgi?id=36241

            Bug ID: 36241
           Summary: Unused index call of zero-sized array with libcxx
                    causes compile error
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: niravd at google.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 19812
  --> https://bugs.llvm.org/attachment.cgi?id=19812&action=edit
failing test.

The following code no longer compiles with libcxx. It appears to be due to
r324182. 

error: non-const lvalue reference to type
      'std::__1::array<unsigned int, 0>::value_type' (aka 'unsigned int')
cannot bind to a value of unrelated type 'std::__1::aligned_storage<4,
4>::type'
    reference operator[](size_type __n)             {return __elems_[__n];}


Command: clang -stdlib=libc++  ~/foo.cc

#include <array>

template <size_t N>
void foo(std::array<uint32_t, N> x) {
  for (size_t i = 0; i < N; ++i)
    x[i] = x[i]++;
}


void bar() {
  foo(std::array<uint32_t, 0>());
  return;
}

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