2010-12-06  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/46821
	* include/std/tuple (_Head_base<,, true>::_M_swap_impl):
	Swap the empty bases.
	(_Head_base<,, false>::_M_swap_impl): Minor tweak.
	* testsuite/20_util/weak_ptr/comparison/cmp_neg.cc: Adjust dg-error
	line number.

From-SVN: r167497