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

[Dennis Raddle]

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 <ivanperezdominguez at gmail.com>
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 <dennis.raddle at gmail.com>
> 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?
>>
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