I had a line of math-prog code that had a circular reference:
param FromNode{ (train,sd,seq) in TRAIN_SEGS } symbolic :=
Terminal[FromNode[train,sd,seq]];
GMPL, much further down in the model, just stops without any warning or
anything else. It took a while to figure out the circular reference and
fix my error. If possible, it would be nice if GMPL could discover this
and issue a message.
-Marc
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