Re: [Haskell-cafe] Prelude.undefined

On Wed, Mar 3, 2010 at 10:56 AM, Tom Hawkins wrote:

On Wed, Mar 3, 2010 at 7:24 AM, Alexander Dunlap wrote:

...

On Tue, Mar 2, 2010 at 9:06 PM, Tom Hawkins wrote:

...

How do I track down an reference to an undefined value?  My program must not be using a library correctly because the program makes no direct use of 'undefined'.  Running with +RTS -xc yields:

While the debugger, etc., are very useful tools, I find that often the easiest way to track down this sort of bug is to test your code function-by-function.

The debugger was not that helpful, so I may have to resort to this.

Is there any work being done to improve reporting for these type of errors?  It seems to be a fairly common problem.

You try the Interlude? http://hackage.haskell.org/package/interlude -- gwern