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Closures: Difference between revisions
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* '''Downward''', or else inward;
* '''Upward''', else outward
A closure is downward when neither the subprogram, nor the context to which it refers, as well as any types they use, leave the corresponding scopes upon passing the closure. It is passed '''down''' the scope. A closure is upward otherwise.
Implementation of downward closures does not require much
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