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T7558.hs:8:18: error:
• Occurs check: cannot construct the infinite type: a ~ Maybe a
• In the expression: y
In the first argument of ‘seq’, namely ‘[x, y]’
In the expression: [x, y] `seq` True
• Relevant bindings include
y :: Maybe a (bound at T7558.hs:8:10)
x :: a (bound at T7558.hs:8:8)
f :: T a a -> Bool (bound at T7558.hs:8:1)
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