2013-09-12  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/58403
	* include/bits/stl_iterator.h (__normal_iterator<>::operator[],
	operator+=, operator+, operator-=, operator-): Take the argument
	by value.
	* testsuite/24_iterators/normal_iterator/58403.cc: New.