This GDB was configured as "i586-pc-haiku"...
(gdb) run c koch
Starting program: /boot/home/src/Nimrod/bin/nimrod c koch
Error while mapping shared library sections:
commpage: No such file or directory.
Error while reading shared library symbols:
commpage: No such file or directory.
config/nimrod.cfg(36, 2) Hint: added path: '/boot/home/.babel/pkgs/' [Path]
Hint: used config file 'config/nimrod.cfg' [Conf]
Hint: used config file 'koch.nimrod.cfg' [Conf]
Hint: system [Processing]
lib/system.nim(53, 30) Hint: 'T' is declared but not used [XDeclaredButNotUsed]
lib/system.nim(170, 27) Hint: 'T' is declared but not used [XDeclaredButNotUsed]
lib/system.nim(171, 30) Hint: 'T' is declared but not used [XDeclaredButNotUsed]
lib/system.nim(171, 27) Hint: 'I' is declared but not used [XDeclaredButNotUsed]
lib/system.nim(173, 35) Hint: 'T' is declared but not used [XDeclaredButNotUsed]
lib/system.nim(177, 31) Hint: 'T' is declared but not used [XDeclaredButNotUsed]
lib/system.nim(178, 23) Hint: 'T' is declared but not used [XDeclaredButNotUsed]
lib/system.nim(179, 23) Hint: 'T' is declared but not used [XDeclaredButNotUsed]
Error: unhandled exception: Invalid Argument [EOS]

Program exited normally.
gdb: child_close, inferior_ptid=3494
(gdb) bt
No stack.