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T5300.hs:15:9:
Could not deduce (C1 a1 b2 c0) arising from a use of `f1'
from the context (Monad m, C1 a1 b1 c1, C2 a2 b2 c2)
bound by the type signature for
f2 :: (Monad m, C1 a1 b1 c1, C2 a2 b2 c2) =>
a1 -> StateT (T b2) m a2
at T5300.hs:14:7-69
The type variable `c0' is ambiguous
Possible 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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