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tcfail001.hs:9:2: error:
• Couldn't match expected type: [a]
with actual type: [a0] -> [a1]
• The equation for ‘op’ has one value argument,
but its type ‘[a]’ has none
In the instance declaration for ‘A [a]’
• Relevant bindings include op :: [a] (bound at tcfail001.hs:9:2)
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