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T3613.hs:14:20: error:
• Couldn't match type ‘IO’ with ‘Maybe’
Expected type: Maybe b
Actual type: IO b
• In the first argument of ‘fooThen’, namely ‘(bar >> undefined)’
In the expression: fooThen (bar >> undefined)
In the expression:
let fooThen m = foo >> m in fooThen (bar >> undefined)
T3613.hs:17:24: error:
• 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 })’
In the expression:
fooThen
(do { bar;
undefined })
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