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FuturesUnordered: fix partial iteration by wfraser · Pull Request #2574 · rust-l...
source link: https://github.com/rust-lang/futures-rs/pull/2574
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The IntoIter impl advances the head pointer every iteration, but this breaks the linked list invariant that the head's prev should be null.
If the iteration is not done to completion (which sets head to null), on subsequent drop, FuturesUnordered::unlink relies on this broken invariant and ends up panicking.
The fix is to maintain the head->prev == null invariant while iterating.
Fixes #2573
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