* friend.c (do_friend): Pull the identifier out of declarator.
	Use cp_error and friends.
	* decl2.c (qualified_lookup_using_namespace): Fix call to
	purpose_member.
	* decl.c (lookup_name_real): Don't call complete_type on a namespace.
	(grokvardecl): Use DECL_CLASS_SCOPE_P.
	(xref_basetypes): Fix call to GNU_xref_hier.
	* cvt.c (convert_pointer_to_real): Check for error_mark_node sooner.
	* class.c (warn_hidden): Fix for OVERLOAD.
	From grahams@rcp.co.uk:
	* cp-tree.h (DEFARG_NODE_CHECK): New macro.
 	(DEFARG_LENGTH, DEFARG_POINTER): Use it.

From-SVN: r21068