[Haskell-cafe] Hints for Euler Problem 11

Lennart Augustsson lennart at augustsson.net
Fri Aug 17 20:59:32 EDT 2007

On 8/17/07, Kim-Ee Yeoh <a.biurvOir4 at asuhan.com> wrote:
> Lennart Augustsson wrote:
> >
> > And as a previous poster showed, ghc does concatenate strings.
> >
> And Haskell (as in the current language definition) does not.
> I was talking about Haskell.

Haskell says nothing about compile time or run time in the language
definition.  Nor does it say exactly when things are evaluated.  Even the
tag line for Haskell says "non-strict" rather than lazy.
So Haskell semantics allows many evaluation strategies, and evaluating
terminating constant expression at compile time is certainly one of them.
You don't have to, but it's permissible.

  -- Lennart
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