Pavel Yaskevich daf4c2f3b5 [CSSolver] Add skeleton of iterative solve ...

The idea so to split solving into non-recursive steps,
represented by `SolverStep`, each of the steps is resposible
for a unit of work e.g. attempting type variable or
disjunction bindings/choices.

Each step could produce more work via "follow-up" steps,
complete "partial" solution when it's done, or error which
terminates solver loop.

2018-09-15 20:56:46 -07:00

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