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http://John Kozlov/ (
john kozlov
) wrote
in
deniok
2016-04-07 09:57 am (UTC)
no subject
В голову приходит только дебильное:
data T = T (IO ())
instance Eq T where { _ == _ = True }
f = id
Теперь:
id $ putStrLn "abc" == putStrLn "abc" -- не компилируется
id $ T (putStrLn "abc") == T (putStrLn "abc") -- компилируется
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no subject
data T = T (IO ())
instance Eq T where { _ == _ = True }
f = id
Теперь:
id $ putStrLn "abc" == putStrLn "abc" -- не компилируется
id $ T (putStrLn "abc") == T (putStrLn "abc") -- компилируется