2011-01-18  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/bits/unique_ptr.h (default_delete<>::default_delete()):
	Declare defaulted per DR 1517.
	* testsuite/util/testsuite_common_types.h
	(constexpr_defaulted_default_constructible): Add.
	* testsuite/20_util/default_delete/cons/constexpr.cc: Use it.

From-SVN: r168947