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mc19.hs:10:31: error: [GHC-25897]
• Couldn't match type ‘a’ with ‘[a]’
Expected: [a] -> [a]
Actual: [a] -> [[a]]
‘a’ is a rigid type variable bound by
a type expected by the context:
forall {a}. [a] -> [a]
at mc19.hs:10:31-35
• In the expression: inits
In a stmt of a monad comprehension: then inits
In the expression: [x | x <- [3, 2, 1], then inits]
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