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tcfail168.hs:8:11:
Couldn't match expected type `Char -> a0' with actual type `IO ()'
In the return type of a call of `putChar'
Probable cause: `putChar' is applied to too many arguments
In a stmt of a 'do' block: putChar 'a'
In the expression:
do { putChar;
putChar 'a';
putChar 'a';
putChar 'a';
.... }
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