Index: include/std/bitset
===================================================================
--- include/std/bitset	(revision 173064)
+++ include/std/bitset	(working copy)
@@ -80,11 +80,11 @@
 
 #ifdef __GXX_EXPERIMENTAL_CXX0X__
       constexpr _Base_bitset(unsigned long long __val)
-      : _M_w({ _WordT(__val)
+      : _M_w{ _WordT(__val)
 #if __SIZEOF_LONG_LONG__ > __SIZEOF_LONG__
 	       , _WordT(__val >> _GLIBCXX_BITSET_BITS_PER_WORD)
 #endif
-       }) { }
+       } { }
 #else
       _Base_bitset(unsigned long __val)
       : _M_w()
Index: include/std/complex
===================================================================
--- include/std/complex	(revision 173064)
+++ include/std/complex	(working copy)
@@ -1,7 +1,7 @@
 // The template and inlines for the -*- C++ -*- complex number classes.
 
 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
-// 2006, 2007, 2008, 2009, 2010
+// 2006, 2007, 2008, 2009, 2010, 2011
 // Free Software Foundation, Inc.
 //
 // This file is part of the GNU ISO C++ Library.  This library is free
@@ -1046,7 +1046,14 @@
       _GLIBCXX_CONSTEXPR complex(_ComplexT __z) : _M_value(__z) { }
 
       _GLIBCXX_CONSTEXPR complex(float __r = 0.0f, float __i = 0.0f)
-      : _M_value(__r + __i * 1.0fi) { }
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+      : _M_value{ __r, __i } { }
+#else
+      {
+	__real__ _M_value = __r;
+	__imag__ _M_value = __i;
+      }
+#endif
 
       explicit _GLIBCXX_CONSTEXPR complex(const complex<double>&);
       explicit _GLIBCXX_CONSTEXPR complex(const complex<long double>&);	
@@ -1186,7 +1193,14 @@
       _GLIBCXX_CONSTEXPR complex(_ComplexT __z) : _M_value(__z) { }
 
       _GLIBCXX_CONSTEXPR complex(double __r = 0.0, double __i = 0.0)
-      : _M_value(__r + __i * 1.0i) { }
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+      : _M_value{ __r, __i } { }
+#else
+      {
+	__real__ _M_value = __r;
+	__imag__ _M_value = __i;
+      }
+#endif
 
       _GLIBCXX_CONSTEXPR complex(const complex<float>& __z)
       : _M_value(__z.__rep()) { }
@@ -1328,7 +1342,14 @@
 
       _GLIBCXX_CONSTEXPR complex(long double __r = 0.0L, 
 				 long double __i = 0.0L)
-      : _M_value(__r + __i * 1.0Li) { }
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+      : _M_value{ __r, __i } { }
+#else
+      {
+	__real__ _M_value = __r;
+	__imag__ _M_value = __i;
+      }
+#endif
 
       _GLIBCXX_CONSTEXPR complex(const complex<float>& __z)
       : _M_value(__z.__rep()) { }
Index: testsuite/26_numerics/complex/cons/48760.cc
===================================================================
--- testsuite/26_numerics/complex/cons/48760.cc	(revision 0)
+++ testsuite/26_numerics/complex/cons/48760.cc	(revision 0)
@@ -0,0 +1,56 @@
+// Copyright (C) 2011 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>
+#include <limits>
+#include <testsuite_hooks.h>
+
+template<typename T>
+  void do_test01()
+  {
+    bool test __attribute__((unused)) = true;
+
+    if (std::numeric_limits<T>::has_quiet_NaN)
+      {
+	std::complex<T> c1(T(0), std::numeric_limits<T>::quiet_NaN());
+	VERIFY( c1.real() == T(0) );
+	VERIFY( std::isnan(c1.imag()) );
+
+	std::complex<T> c2(std::numeric_limits<T>::quiet_NaN(), T(0));
+	VERIFY( std::isnan(c2.real()) );
+	VERIFY( c2.imag() == T(0) );
+
+	std::complex<T> c3(std::numeric_limits<T>::quiet_NaN(),
+			   std::numeric_limits<T>::quiet_NaN());
+	VERIFY( std::isnan(c3.real()) );
+	VERIFY( std::isnan(c3.imag()) );
+      }
+  }
+
+// libstdc++/48760
+void test01()
+{
+  do_test01<float>();
+  do_test01<double>();
+  do_test01<long double>();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
Index: testsuite/26_numerics/complex/cons/48760_c++0x.cc
===================================================================
--- testsuite/26_numerics/complex/cons/48760_c++0x.cc	(revision 0)
+++ testsuite/26_numerics/complex/cons/48760_c++0x.cc	(revision 0)
@@ -0,0 +1,58 @@
+// { dg-options "-std=gnu++0x" }
+
+// Copyright (C) 2011 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>
+#include <limits>
+#include <testsuite_hooks.h>
+
+template<typename T>
+  void do_test01()
+  {
+    bool test __attribute__((unused)) = true;
+
+    if (std::numeric_limits<T>::has_quiet_NaN)
+      {
+	std::complex<T> c1(T(0), std::numeric_limits<T>::quiet_NaN());
+	VERIFY( c1.real() == T(0) );
+	VERIFY( std::isnan(c1.imag()) );
+
+	std::complex<T> c2(std::numeric_limits<T>::quiet_NaN(), T(0));
+	VERIFY( std::isnan(c2.real()) );
+	VERIFY( c2.imag() == T(0) );
+
+	std::complex<T> c3(std::numeric_limits<T>::quiet_NaN(),
+			   std::numeric_limits<T>::quiet_NaN());
+	VERIFY( std::isnan(c3.real()) );
+	VERIFY( std::isnan(c3.imag()) );
+      }
+  }
+
+// libstdc++/48760
+void test01()
+{
+  do_test01<float>();
+  do_test01<double>();
+  do_test01<long double>();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
