PR c++/28258
	* method.c (locate_copy): Check for non_reference
	returning error_mark_node.

        PR c++/28260
	* decl.c (duplicate_decls): Return error_mark_node
	on ambiguous declaration.

	PR c++/28258
	* g++/dg/other/error13.C: New test.

	PR c++/28260
	* g++.dg/template/friend44.C: New test.

From-SVN: r115561