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tcfail001.hs:9:2:
Couldn't match expected type ‛[t0] -> [t1]’ with actual type ‛[a]’
Relevant bindings include op :: [a] (bound at tcfail001.hs:9:2)
The equation(s) for ‛op’ have one argument,
but its type ‛[a]’ has none
In the instance declaration for ‛A [a]’
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