[Haskell-cafe] Why aren't there anonymous sum types in Haskell?

[Anton Nikishaev]

Arlen Cuss <celtic at sairyx.org> writes:

>>  import Data.Either
>>  type (:|:) a b = Either a b
>>  (???) = either
>> 
>>  foo :: (Int :|: Bool :|: String :|: Double) -> Int
>>  foo =
>>     \ i  -> i + 7  ???
>>     \ b -> if b then 1 else 0 ???
>>     \ s -> length s ???
>>     \ d -> floor d
>
> INFIX TYPE OPERATORS!!??!
>
> O_________________________________________O

Yep.
http://www.haskell.org/ghc/docs/7.0.3/html/users_guide/data-type-extensions.html#infix-tycons


-- 
lelf