[gecode-users] Grey subtrees in Gist

[Tommaso Urli]

Hi everyone,
     today I was messing with a custom brancher for a model, and I got 
these grey subtrees in Gist, however I can't find any documentation on 
what exactly they are. Hint: running the same setup without Gist results 
in the following error

Exception: Space::commit: Attempt to commit with illegal alternative.
Stopping...

I therefore ask for your help :)

Tommaso
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