If I uncomment the default debug line:
hPutStrLn stderr “Debug Messages …”
the compiler fails to parse hPutStrLn
hPutStrLn should be in System.IO, which I see is imported correctly.
Is it possible to check this please?
Thanks
It parses, it works OK. What is the exact error you’re getting?
Could you share us, through pastebin, a code where this bug happens (without written code to solve the puzzle 
).
As of now, I just went to Onboarding puzzle, uncommented line:
and it works fine.
Problem seems to have resolved - may have been an indentation error
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