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T13311.hs:9:3: error:
• Couldn't match expected type ‘IO a0’
with actual type ‘Maybe a1 -> Maybe b0’
• Probable cause: ‘f’ is applied to too few arguments
In a stmt of a 'do' block: f
In the expression:
do f
putChar 'a'
In an equation for ‘g’:
g = do f
putChar 'a'
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