Hi! The following file is fine in non TeX output, but dies on the single-argument @ref in PDF, because of the +.
Cheers!
\input texinfo @c -*-texinfo-*-
@setfilename bison.info
@settitle Bison
@xrefautomaticsectiontitle on
@node Top
@top Bison
@node Chapter
@chapter Chapter
@node C++ Variants
@section C++ Variants
@xref{C++ Variants,, C++ Variants}.
@xref{C++ Variants}.
@bye
