Document multi-iterator for loops - #591
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ponyc#5896 adds sugar for iterating multiple collections in a single for loop. This covers the destructured binding form, shortest-iterator semantics, and the desugared while-loop equivalent.
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ponyc#5896 adds multi-iterator for loop sugar. This adds a "Multiple iterators" subsection to the For section of the control structures tutorial, covering the destructured binding form, single-name binding, shortest-iterator semantics, and the desugared while-loop equivalent.
Draft until ponyc#5896 is released.