From doug at cs.dartmouth.edu  Sun Aug  3 20:44:38 2014
From: doug at cs.dartmouth.edu (Doug McIlroy)
Date: Sun, 03 Aug 2014 16:44:38 -0400
Subject: [Hugs-users] extra newline after putStrLn?
Message-ID: <201408032044.s73Kices015683@tahoe.cs.dartmouth.edu>

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

Doug McIlroy

From ndmitchell at gmail.com  Sun Aug  3 20:59:33 2014
From: ndmitchell at gmail.com (Neil Mitchell)
Date: Sun, 3 Aug 2014 21:59:33 +0100
Subject: [Hugs-users] extra newline after putStrLn?
In-Reply-To: <201408032044.s73Kices015683@tahoe.cs.dartmouth.edu>
References: <201408032044.s73Kices015683@tahoe.cs.dartmouth.edu>
Message-ID: <CAKcFpmJBBZCQqmoBuKRHiBBDanCiUqZp0cZx2JHZSbyhF6cMwg@mail.gmail.com>

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 <doug at cs.dartmouth.edu> wrote:
> Why does putStrln "" produce two newlines in hugs, but one in ghci?
>
> Doug McIlroy
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