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Class Uq_engines.sync_engine

class [['a, 'b]] sync_engine : 'a #engine -> 'b #engine -> [('a * 'b)] engine
This engine runs two engines in parallel, and waits until both are `Done (synchronization). The product of the two `Done arguments is taken as the combined result.

If one of the engines goes to the states `Aborted or `Error, the combined engine will follow this transition. The other, non-aborted and non-errorneous engine is aborted in this case. `Error has higher precedence than `Aborted.

If the combined engine is aborted, this request is forwarded to both member engines.

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