PR c++/28025
	* cp-tree.h (LOOKUP_HIDDEN): New macro.  Reformat comments.
	* name-lookup.c (unqualified_namespace_lookup): There is no way to
	have a hidden name in non-namespace scopes.
	* pt.c (tsubst_friend_class): Look for hidden names.
	* decl.c (lookup_and_check_tag): Fix typo in comment.
	* semantics.c (finish_compound_literal): Fix typo in comment.
	PR c++/28025
	* g++.dg/template/friend45.C: New test.

From-SVN: r115687