+// { dg-do compile }
+// { dg-options "-std=gnu++0x" }
+
+// Copyright (C) 2010 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <complex>
+
+// User defined type, so that the primary std::complex template is used.
+namespace numext
+{
+ struct ldld_base
+ {
+ long double one;
+ long double two;
+ };
+
+ struct ldld_lit : public ldld_base
+ { };
+
+ struct ldld_nonlit : public ldld_base
+ {
+ ~ldld_nonlit() { }
+ };
+
+ bool
+ operator<(const ldld_base __a, const ldld_base __b)
+ { return __a.one < __b.one && __a.two < __b.two; }
+
+ bool
+ operator==(const ldld_base __a, const ldld_base __b)
+ { return __a.one == __b.one && __a.two == __b.two; }
+
+ ldld_base
+ operator+=(const ldld_base __a, const ldld_base __b)
+ { return ldld_base({ __a.one + __b.one, __a.two + __b.two}); }
+
+ ldld_base
+ operator-=(const ldld_base __a, const ldld_base __b)
+ { return ldld_base({ __a.one - __b.one, __a.two - __b.two}); }
+
+ ldld_base
+ operator*=(const ldld_base __a, const ldld_base __b)
+ { return ldld_base({ __a.one * __b.one, __a.two * __b.two}); }
+
+ ldld_base
+ operator/=(const ldld_base __a, const ldld_base __b)
+ { return ldld_base({ __a.one / __b.one, __a.two / __b.two}); }
+
+}
+
+constexpr std::complex<numext::ldld_lit> lit; // ok
+// constexpr std::complex<numext::ldld_nonlit> nonlit; // error