26 May
2014
26 May
'14
9:21 a.m.
On Mon, May 26, 2014 at 5:21 PM, Daniel Fischer < daniel.is.fischer@googlemail.com> wrote:
To evaluate something completely, one needs to evaluate a value that depends on the complete structure. Presumably, to determine the length of the list, one needs to evaluate all paths completely to see whether they lead to a valid puzzle, hence the evaluation is forced by demanding the evaluation of the length.
To avoid that presumption, you could also write evaluate $ rnf x whenever x is an instance of NFData. The length function strikes me as a kludgy stand-in for rnf when rnf is really what's meant. -- Kim-Ee