[developers] "nested unification context"

[Stephan Oepen]

great, thanks, ned!

i can reproduce the issue, though only when parsing from
the Lisp prompt, i.e.

  (lkb::do-parse-tty "der man leyen-t dos bukh")

as someone who programs in lisp, i suspect that is what
you usually do?  if so, the error goes away when i leave
the error context, i.e. type ‘:reset’ to the lisp prompt.

when going through ‘Parse|Parse input ...’, i cannot get
nested unification contexts using your grammar; is there
more to the recipe?  or are actually those students who
have run into this problem all using the TTY interface?

best, oe


On Fri, May 10, 2013 at 11:42 PM, Ned Letcher <nletcher at gmail.com> wrote:
> I've been able to reliably reproduce this -- at least on my machine. This
> error seems to occur following a parse that was aborted due to running out
> of edges. ie:
>
> "Probable runaway rule: parse/generate aborted (see documentation for
> *maximum-number-of-edges*)"
>
> Once this has occurred it seems that anything that then involves unification
> results in the nested unification error, such as parsing, or loading a
> grammar.
>
> I've attached a grammar that will give the max edges error if you try to
> parse "der man leyen-t dos bukh". Then you can reload the grammar or try to
> parse the string again to get the nested unification error.
>
> Ned
>
>
>
> On Fri, May 10, 2013 at 6:04 AM, Ann Copestake <Ann.Copestake at cl.cam.ac.uk>
> wrote:
>>
>>
>> in case it helps - I recollect that error message as turning up in highly
>> misleading contexts.  The ones I remember were code bugs - feature
>> structure
>> creation not being called correctly.  These could potentially turn up in
>> lkb/user-fns.lsp as well as in the main code, so if that's been modified,
>> I'd
>> be suspicious.
>>
>> Best,
>>
>> Ann
>>
>>
>>
>>
>
>
>
> --
> nedned.net