User-reported unhelpful error message

[codeworld-feedback]

Program: https://code.world/haskell#PBmh5IOClnlsg7K7H8VDU7Q

Comment:

As a suggestion: it would be helpful if clicking "Not helpful" gives you help about the error message :)

Message:

program.hs:1:1: error:
    The IO action ‘main’ is not defined in module ‘Main’