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

[Daniel Fischer]

On Monday 22 August 2011, 09:32:45, Sunil S Nandihalli wrote:
> Hello everybody,
> main: <<loop>>  -> where did this come from. I know I am not printing
> it anywhere .. and it is not printing some of things I am tracing
> using Debug.Trace module. Can somebody help?
> Thanks,
> Sunil.
> 

Okay, after breaking the infinite loop by setting

expandedTrapezia = expandedTrapezia'

I don't get a "<<loop>>", but, depending on the input complaints about

main: Prelude.last: empty list

or

main: Set.findMin: empty set has no minimal element