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  1. -- https://q...content-available-to-author-only...a.com/kerupani129/items/333155e5e2dee644d6dc　のコードを実行して試す
  2. main :: IO ()
  3. main = do
  4.  
  5.     print $ ([23] :: [Int]) <> ([42] :: [Int])
  6.  
  7.     print $ (Right 23 :: Either String Int) <> (Right 42 :: Either String Int)
  8.  
  9.     print $ (() :: ()) <> (() :: ())
  10.  
  11.     print =<< (pure () :: IO ()) <> (pure () :: IO ())
Success #stdin #stdout 0s 5320KB
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Standard input is empty
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[23,42]
Right 23
()
()
https://ideone.com/45Tq2e
language:
Haskell (ghc 8.4.4)
created:
4 days ago
visibility:
public

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