Matt Wette writes: Hey Matt, > Nyacc 0.82.1 has been released. Congrats! It's been a while but in 0.82.0 I found a regression of a bug that you fixed earlier, I think in 0.80.4 https://lists.gnu.org/archive/html/guile-user/2017-06/msg00003.html I've attached the problematic file again. It's also still present in 0.82.1 $ guile GNU Guile 2.2.2 Copyright (C) 1995-2017 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)> (use-modules (nyacc lalr)) scheme@(guile-user)> *nyacc-version* $1 = "0.82.1" scheme@(guile-user)> (use-modules (nyacc lang c99 parser)) scheme@(guile-user)> (with-input-from-file "def-bwl.c" parse-c99) (unknown):1: parse failed at state 89, on input "DEF_BWL" (unknown):1: C99 parse error $2 = #f Greetings, janneke