[Haskell-beginners] Re: Non-recursive binding expression

1 Mar 2009

       writes:
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On Sat, Feb 28, 2009 at 01:01:56PM -0500, Brent Yorgey wrote:
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On Sat, Feb 28, 2009 at 05:19:03PM +0000, Will Ness wrote:
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 writes:
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Is there any non-recursive binding expression in Haskell?
Assignment in Haskell is not destructive update.
I am not asking for assignment. What I want is indeed what I already
said: a new lexical scope which introduces a new variable, but the
variable name is being reused. That shadows the previous definition.
Romildo
The code I posted has exactly these semantics: 

When we write

  test = head $ 
    do xs <- [ [] ]
       xs <- [ 3:xs ]
       xs <- [ 8:xs ]
       xs <- [ 7:xs ]
       return xs

each xs in a singleton generator refers to its previous binding.