Re: ob-scheme haunted source code block?

[Neil Jerram <neiljerram@gmail.com>]

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On Fri, 17 Jan 2020 at 12:01, Joost Kremers <joostkremers@fastmail.fm>
wrote:

> Hi list,
>
> I've been learning some Scheme recently and decided to use Org
> mode and babel so I could document my progress, keep notes, etc.
> together with the code I write. I also installed the geiser
> package to work with Scheme source files directly.
>
> This all worked perfectly, until I made the (apparent) mistake of
> typing =C-c C-c= on an expression while editing a source code
> block. That is, I had pressed =C-c '= in an Org buffer on a source
> block and in the editing buffer that popped up, I hit =C-c C-c=
> (bound to =geiser-eval-definition=) on a particular function (well
> procedure...) definition.
>
> From that moment on, that particular procedure definition seems
> haunted. Whenever I evaluate a source block containing it from
> within an Org file, the associated REPL is doomed. It takes about
> 30 seconds for the evaluation to complete, during which time Emacs
> seems to hang (no CPU activity, just waiting). Any further
> interaction with the REPL from that point on, either from other
> source blocks in the same file (all source blocks in it use the
> same session) or in the REPL buffer directly, causes the same
> hang.
>
> I can `C-g` out of the hang, but this doesn't solve much because
> any further interaction causes the same hang.
>
> Putting the relevant procedure definition in a Scheme source file
> and evaluating that (within Emacs, through geiser) is
> unproblematic, so the code itself is not to blame.
>

OK, up to this point I am thinking: this is all quite curious, but
presumably not really a big problem, as you surely don't need to use this
rather strange workflow...


> The weirdest thing about this is that the problem is persistent. I
> restarted Emacs and in my desperation even rebooted the computer,
> but to no avail.
>

But this is indeed weird.  Are you saying that you can reboot your
computer, restart Emacs, open the relevant Org file, evaluate the source
block (without any C-c ') and you still see the problem?

If so, I wonder if it's a real but intermittent problem in your code that
was somehow made more likely by the original workflow, and now you're just
being unlucky?


>
> Does anyone have any idea what might be going on? I rgrepped
> through my =.emacs.d= directory to see if the relevant procedure
> name turns up anywhere but found nothing. I'm not really sure
> where to look beyond that.
>
> Versions:
>
> IELM> emacs-version
> "26.3"
> IELM> org-version
> "9.3.1"
>
> TIA
>
> Joost
>
> --
> Joost Kremers
> Life has its moments
>
>
Best wishes,
   Neil

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