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T5300.hs:15:9:
Ambiguous type variable `c0' in the constraint:
(C1 a1 b2 c0) arising from a use of `f1'
Probable fix: add a type signature that fixes these type variable(s)
In the first argument of `(>>=)', namely `f1 fm'
In the expression: f1 fm >>= return . undefined
In an equation for `f2': f2 fm = f1 fm >>= return . undefined
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