[llvm-bugs] [Bug 32822] New: clang crashes with arrays of std::complex

[via llvm-bugs]

http://bugs.llvm.org/show_bug.cgi?id=32822

            Bug ID: 32822
           Summary: clang crashes with arrays of std::complex
           Product: clang
           Version: 4.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: powerchord at web.de
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Created attachment 18370
  --> http://bugs.llvm.org/attachment.cgi?id=18370&action=edit
Error message with Visual Studio 2017

#include <complex>

// clang crashes here with any array size > 1
std::complex<double> v[2];

// I suppose the reason is a constexpr constructor with the parameter type
being const &. Please see the following explanation and the attachment

struct A
{
    constexpr A(const int & = 0) {}
};
struct B    // = A without &
{
    constexpr B(const int /*&*/ = 0) {}
};
struct C    // = A without constexpr
{
    /*constexpr*/ C(const int & = 0) {}
};

A a1[1];    // OK
A a2[2];    // clang crashes
B b[2];     // OK
C c[2];     // OK

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