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tcfail168.hs:7:11:
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';
.... }
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