2015-07-15  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/57394
	* include/std/streambuf (basic_streambuf(const basic_streambuf&)):
	Fix initializer for _M_out_end.
	(operator=(const basic_streambuf&)): Replace stub with actual
	implementation.

--- libstdc++-v3/include/std/streambuf
+++ libstdc++-v3/include/std/streambuf
@@ -802,12 +802,22 @@
       basic_streambuf(const basic_streambuf& __sb)
       : _M_in_beg(__sb._M_in_beg), _M_in_cur(__sb._M_in_cur), 
       _M_in_end(__sb._M_in_end), _M_out_beg(__sb._M_out_beg), 
-      _M_out_cur(__sb._M_out_cur), _M_out_end(__sb._M_out_cur),
+      _M_out_cur(__sb._M_out_cur), _M_out_end(__sb._M_out_end),
       _M_buf_locale(__sb._M_buf_locale) 
       { }
 
       basic_streambuf&
-      operator=(const basic_streambuf&) { return *this; };
+      operator=(const basic_streambuf& __sb)
+      {
+	_M_in_beg = __sb._M_in_beg;
+	_M_in_cur = __sb._M_in_cur;
+	_M_in_end = __sb._M_in_end;
+	_M_out_beg = __sb._M_out_beg;
+	_M_out_cur = __sb._M_out_cur;
+	_M_out_end = __sb._M_out_end;
+	_M_buf_locale = __sb._M_buf_locale;
+	return *this;
+      };
     };
 
   // Explicit specialization declarations, defined in src/streambuf.cc.