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[Proposal] Separating callback chain building and actual invocation

48

Currently, the callback chain building and the actual invocation is done at the same time. This means that invocation of `Generator::run` needs to check for initialization and that under debug...

NobodyXu

See [`Iterator::intersperse`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.intersperse)

AndWass

See [`Iterator::peekable`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.peekable)

AndWass

See how iterators are doing it

AndWass