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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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// PR c++/49136
// { dg-do compile { target c++11 } }

struct day
{
  unsigned d : 5;
  unsigned n : 3;
  constexpr explicit day (int dd) : d(dd), n(7) {}
};

struct date {
  int d;
  constexpr date (day dd) : d(dd.n != 7 ? 7 : dd.d) {}
};

constexpr day d(0);
constexpr date dt(d);
static_assert (dt.d == 0, "Error");