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tcfail168.hs:7:11: error:
• Couldn't match expected type ‘IO a0’
with actual type ‘Char -> IO ()’
• Probable cause: ‘putChar’ is applied to too few arguments
In a stmt of a 'do' block: putChar
In the expression:
do putChar
putChar 'a'
putChar 'a'
putChar 'a'
....
In an equation for ‘foo’:
foo
= do putChar
putChar 'a'
putChar 'a'
....
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