2011-09-26  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/50529
	* include/bits/vector.tcc (vector<>::erase(iterator, iterator)):
	Fix to do nothing if the range is empty.
	* include/bits/stl_bvector.h: Likewise.
	* include/bits/deque.tcc: Likewise.
	* include/debug/vector: Adjust.
	* include/debug/deque: Likewise.
	* testsuite/23_containers/vector/modifiers/erase/50529.cc: New.
	* testsuite/23_containers/deque/modifiers/erase/50529.cc: Likewise.
	* testsuite/23_containers/deque/modifiers/erase/3.cc: Adjust.

From-SVN: r179234