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T1900.hs:11:12:
No instance for (Num ())
arising from a use of `+'
Possible fix: add an instance declaration for (Num ())
In the expression: (+ 1)
In an equation for `trans': trans = (+ 1)
In the instance declaration for `Bug Int'
T1900.hs:14:22:
Could not deduce (Depend s0 ~ Depend s)
from the context (Bug s)
bound by the type signature for check :: Bug s => Depend s -> Bool
at T1900.hs:13:10-36
NB: `Depend' is a type function, and may not be injective
The type variable `s0' is ambiguous
Possible fix: add a type signature that fixes these type variable(s)
In the first argument of `trans', namely `d'
In the second argument of `(==)', namely `trans d'
In the expression: d == trans d
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