Sorry! I will no longer do it :)
Thank you for help!

For a long time this kata worked without problem. CW changed something and I reported the bug long ago but it seems that nothing was made...
I just fixed it with a pragma and it works now.
PS: not useful to report so many outputs:-)
Cheers!

I have sterr when run Attempt:

/tmp/haskell1161126-18-1edhqlb.py900pmn29/Codewars/G964/Printer/Test.hs:11:1: Warning:
Tab character

/tmp/haskell1161126-18-1edhqlb.py900pmn29/Codewars/G964/Printer/Test.hs:12:1: Warning:
Tab character

/tmp/haskell1161126-18-1edhqlb.py900pmn29/Codewars/G964/Printer/Test.hs:26:1: Warning:
Tab character

/tmp/haskell1161126-18-1edhqlb.py900pmn29/Codewars/G964/Printer/Test.hs:27:1: Warning:
Tab character

/tmp/haskell1161126-18-1edhqlb.py900pmn29/Codewars/G964/Printer/Test.hs:28:1: Warning:
Tab character

/tmp/haskell1161126-18-1edhqlb.py900pmn29/Codewars/G964/Printer/Test.hs:29:1: Warning:
Tab character

/tmp/haskell1161126-18-1edhqlb.py900pmn29/Codewars/G964/Printer/Test.hs:30:1: Warning:
Tab character

/tmp/haskell1161126-18-1edhqlb.py900pmn29/Codewars/G964/Printer/Test.hs:31:1: Warning:
Tab character

/tmp/haskell1161126-18-1edhqlb.py900pmn29/Codewars/G964/Printer/Test.hs:32:1: Warning:
Tab character

/tmp/haskell1161126-18-1edhqlb.py900pmn29/Codewars/G964/Printer/Test.hs:33:1: Warning:
Tab character

/tmp/haskell1161126-18-1edhqlb.py900pmn29/Codewars/G964/Printer/Test.hs:34:1: Warning:
Tab character