Re: [Haskell-beginners] main: <<loop>> ....?

thanks a lot Daniel, I had introduced a infinite loop when I added trace to debug my program. Thanks for taking time to look through the code to pinpoint the error. Sunil. On Mon, Aug 22, 2011 at 1:54 PM, Daniel Fischer wrote:

On Monday 22 August 2011, 09:45:46, Sunil S Nandihalli wrote:

...

Hi Benjamin,  It was longer than I could post here .. but here it is ..

https://github.com/sunilnandihalli/is2/blob/master/main.hs

Sorry for the line-mangling:

advanceSweepLineTo front@(rangeToOpenTrapeziaMap,curSweepLineLocation) newSweepLineLocation = let delta = newSweepLineLocation - curSweepLineLocation                                                                                                  (expandedTrapezia',_) = expandToAdvance front newSweepLineLocation                                                                                                  expandedTrapezia = trace (" expandedTrapezia : "++show expandedTrapezia')                                                                                                                     $ expandedTrapezia

There you have an infinite loop of the simple type,

expandedTrapezia = expandedTrapezia

On the right hand side, you're  missing a ', should be expandedTrapezia'

I don't know when you've added the trace calls, so there might well be another problem still.