Generally in Hugs, after doing an IO thing, it writes out a newline. In GHCi, it doesn't. On balance, I think the Hugs way is better, since in GHC it's easy to get to: Prelude> putStrLn "foo" foo Prelude> putStr "foo" fooPrelude> While in Hugs: Hugs> putStrLn "foo" foo Hugs> putStr "foo" foo Hugs> So it's nothing fundamental, just a difference in what to do after some arbitrary IO. Thanks, Neil On Sun, Aug 3, 2014 at 9:44 PM, Doug McIlroy wrote:

Why does putStrln "" produce two newlines in hugs, but one in ghci?

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