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T7368.hs:3:10: error: [GHC-18872]
• Couldn't match kind ‘*’ with ‘* -> *’
When matching types
b0 :: *
Maybe :: * -> *
Expected: a0 -> b0
Actual: c0 Maybe
• In the first argument of ‘b’, namely ‘(l Nothing)’
In the expression: b (l Nothing)
In an equation for ‘f’: f = b (l Nothing)
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