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T7368a.hs:8:6: error: [GHC-18872]
• Couldn't match kind ‘* -> *’ with ‘*’
When matching types
w0 :: * -> *
Bad f :: *
Expected: f (Bad f)
Actual: Bad w0
• In the pattern: Bad x
In an equation for ‘fun’: fun (Bad x) = True
• Relevant bindings include
fun :: f (Bad f) -> Bool (bound at T7368a.hs:8:1)
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