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Today's Topics:
1. 1=2 (M Douglas McIlroy)
2. Re: 1=2 (amin...@mailbox.org)
3. Re: 1=2 (Francesco Ariis)
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Message: 1
Date: Mon, 14 Dec 2020 12:14:53 -0500
From: M Douglas McIlroy <m.douglas.mcil...@dartmouth.edu>
To: beginners@haskell.org
Subject: [Haskell-beginners] 1=2
Message-ID:
<cakh6pixu8dmtmalq4ttzw+scfpjdu7tbyjwwt_m95p5nzne...@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
ghc and ghci 8.6.5 accept 1=2 at top level. It seems to have no effect.
What does it mean?
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Message: 2
Date: Mon, 14 Dec 2020 20:05:05 -0500
From: "amin...@mailbox.org" <amin...@mailbox.org>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] 1=2
Message-ID: <20201215010505.GA18292@painter.painter>
Content-Type: text/plain; charset=us-ascii
It's the same in do-blocks:
main :: IO ()
main = do
let 3 = 2 + 2
putStrLn "Oh fiddlesticks"
On Mon, Dec 14, 2020 at 12:14:53PM -0500, M Douglas McIlroy wrote:
> ghc and ghci 8.6.5 accept 1=2 at top level. It seems to have no effect.
> What does it mean?
> _______________________________________________
> Beginners mailing list
> Beginners@haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
------------------------------
Message: 3
Date: Tue, 15 Dec 2020 02:29:12 +0100
From: Francesco Ariis <fa...@ariis.it>
To: beginners@haskell.org
Subject: Re: [Haskell-beginners] 1=2
Message-ID: <20201215012912.GA24885@extensa>
Content-Type: text/plain; charset=utf-8
Il 14 dicembre 2020 alle 20:05 amin...@mailbox.org ha scritto:
> It's the same in do-blocks:
>
> main :: IO ()
> main = do
> let 3 = 2 + 2
> putStrLn "Oh fiddlesticks"
What happens exactly when I type this?
λ> "prova" = "foo"
λ> 'c' = 'd'
λ> 'c'
'c'
>From the Report I read:
lexp → let decls in exp
decls → { decl1 ; … ; decln } (n ≥ 0)
⁝
decl → (funlhs | pat) rhs
⁝
Am I correct in saying `pat rhs` is the rule being used here? I do not
understand how/when it comes useful in a let
—F
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