debug.h (_Safe_iterator<>(const _Safe_iterator<_MutableIterator,>& __x)):…

debug.h (_Safe_iterator<>(const _Safe_iterator<_MutableIterator,>& __x)): Compare __x base iterator with a default initialized iterator of the same type.

2018-06-21  François Dumont  <fdumont@gcc.gnu.org>

	* include/debug/debug.h
	(_Safe_iterator<>(const _Safe_iterator<_MutableIterator,>& __x)):
	Compare __x base iterator with a default initialized iterator of the
	same type.

From-SVN: r261831

libstdc++-v3/ChangeLog

+2018-06-21  François Dumont  <fdumont@gcc.gnu.org>
+
+	* include/debug/debug.h
+	(_Safe_iterator<>(const _Safe_iterator<_MutableIterator,>& __x)):
+	Compare __x base iterator with a default initialized iterator of the
+	same type.
+
 2018-06-20  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/70966

libstdc++-v3/include/debug/safe_iterator.h

@@ -180,7 +180,7 @@ namespace __gnu_debug
 	  // _GLIBCXX_RESOLVE_LIB_DEFECTS
 	  // DR 408. Is vector<reverse_iterator<char*> > forbidden?
 	  _GLIBCXX_DEBUG_VERIFY(!__x._M_singular()
-				|| __x.base() == _Iterator(),
+				|| __x.base() == _MutableIterator(),
 				_M_message(__msg_init_const_singular)
 				._M_iterator(*this, "this")
 				._M_iterator(__x, "other"));