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Allow recursive closure iterators (#19939)

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Tanguy 2022-06-30 23:19:04 +02:00 • committed by GitHub
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@ -4326,13 +4326,10 @@ Closure iterators and inline iterators have some restrictions:
1. For now, a closure iterator cannot be executed at compile time.
2. `return` is allowed in a closure iterator but not in an inline iterator
(but rarely useful) and ends the iteration.
3. Neither inline nor closure iterators can be (directly)* recursive.
3. Inline iterators cannot be recursive.
4. Neither inline nor closure iterators have the special `result` variable.
5. Closure iterators are not supported by the JS backend.
(*) Closure iterators can be co-recursive with a factory proc which results
in similar syntax to a recursive iterator. More details follow.
Iterators that are neither marked `{.closure.}` nor `{.inline.}` explicitly
default to being inline, but this may change in future versions of the
implementation.