main : halt.
Standard input is empty
Standard output is empty
ERROR: /home/Sok96X/prog:1: Full stop in clause-body? Cannot redefine ,/2 ERROR: /home/Sok96X/prog:4: Initialization goal raised exception: ERROR: prolog_main:main/0: Undefined procedure: main/1 ERROR: However, there are definitions for: ERROR: main/0 ERROR: '$runtoplevel'/0: Undefined procedure: program/0 Exception: (3) program ? EOF: exit