PR c++/26269

        * decl.c (duplicate_decls): Return early if either
        newdecl or olddecl is error_mark_node.

        * g++.dg/other/error14.C: New test.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@116301 138bc75d-0d04-0410-961f-82ee72b054a4