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T3613.hs:14:20:
Couldn't match type ‘IO’ with ‘Maybe’
Expected type: Maybe ()
Actual type: IO ()
In the first argument of ‘(>>)’, namely ‘bar’
In the first argument of ‘fooThen’, namely ‘(bar >> undefined)’
T3613.hs:17:24:
Couldn't match expected type ‘Maybe a0’ with actual type ‘IO ()’
In a stmt of a 'do' block: bar
In the first argument of ‘fooThen’, namely
‘(do { bar;
undefined })’
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