[developers] "nested unification context"

Ned Letcher nletcher at gmail.com
Fri May 10 23:42:56 CEST 2013

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

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.


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

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