2011-04-30  Daniel Krugler  <daniel.kruegler@googlemail.com>

	* include/std/type_traits (__is_default_constructible_atom,
	__is_default_constructible_safe<, true>,
	__is_direct_constructible_new_safe,
	__is_base_to_derived_ref<,, true>, __is_lvalue_to_rvalue_ref<,, true>,
	__is_direct_constructible_ref_cast, __is_direct_constructible,
	__is_nary_constructible): Simplify; add comments throughout.

2011-04-30  Paolo Carlini  <paolo.carlini@oracle.com>

	* testsuite/20_util/make_signed/requirements/typedefs_neg.cc:
	Adjust dg-error line numbers.
	* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc:
	Likewise.
	* testsuite/20_util/declval/requirements/1_neg.cc: Likewise.

From-SVN: r173222