Re: [Haskell-cafe] debugging <<loop>> exception

Thanks everyone. Once I learned what a <<loop>> actually is (I still have a vague understanding but it has something to do with circular definitions) I was able to simply inspect the code that I suspected had the problem and found a typo. It works now. On Sat, Aug 26, 2023 at 6:44 PM Ivan Perez wrote:

Sounds like a Heisenbug (turning profiling or debugging on may affect the reproducibility of the bug).

Run the program for a while with profiling enabled, and the functions involved in the infinite loop might be apparent.

Ivan

On Sat, 26 Aug 2023 at 18:33, Dennis Raddle wrote:

...

I'm getting Exception: <<loop>>.

It doesn't print the line number. When I load the program into ghci, it still doesn't print the line number. When I trace the program in ghci it never gets to the point of emitting the exception.

I set up my program in stack. I tried both "stack ghci" and just "ghci".. the latter to make sure it wasn't using any compiled code (at least in my own code). If it doesn't print a line number does this mean it's happening in compiled code?

Any ideas how I can go about debugging this?

_______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.