trying to parse the manual of the GNU Hello package I get this
scheme@(guile-user)> (open-input-file "progetti/hello-2.6.90/doc/hello.texi") $2 = #<input: progetti/hello-2.6.90/doc/hello.texi 18> scheme@(guile-user)> (texi->stexi $2) texinfo.scm:966:36: In procedure loop: Throw to key `parser-error' with args `(#f "Unknown command" defcodeindex)'. On Guile 2.2.6 (I built it myself) $ opt/bin/guile --listen GNU Guile 2.2.6 Copyright (C) 1995-2019 Free Software Foundation, Inc. Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'. This program is free software, and you are welcome to redistribute it under certain conditions; type `,show c' for details. Enter `,help' for help. scheme@(guile-user)> On Ubuntu 18.04 on x86_64