[Haskell-cafe] curious about sum
tom.davie at gmail.com
Tue Jun 16 07:31:53 EDT 2009
On 16 Jun 2009, at 05:18, Don Stewart wrote:
>> The answer is sometimes (only if you use an optimize flag):
> You're turning on the strictness analyser. That's enabled with -O or
> But sum should be using a tail recursive foldl'. It's a bug in the H98
> report, IMO.
Not at all, as discussed, there are legitimate uses for a lazy sum,
and haskell is a lazy language by default. The only change here needs
to be either claus' suggestion of generalizing functions over their
application operator, or providing a strict sum'.
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