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Implement Chain with Option fuses #70896

Merged
merged 4 commits into from
Apr 9, 2020
Merged

Implement Chain with Option fuses #70896

merged 4 commits into from
Apr 9, 2020

Commits on Apr 7, 2020

  1. Implement Chain with Option fuses 

    The iterators are now "fused" with `Option` so we don't need separate
state to track which part is already exhausted, and we may also get
niche layout for `None`. We don't use the real `Fuse` adapter because
its specialization for `FusedIterator` unconditionally descends into the
iterator, and that could be expensive to keep revisiting stuff like
nested chains. It also hurts compiler performance to add more iterator
layers to `Chain`.
    @cuviper
    cuviper committed Apr 7, 2020
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  2. Reduce callsites in Chain::count()

    @cuviper
    cuviper committed Apr 7, 2020
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  3. Reduce callsites in Chain::last()

    @cuviper
    cuviper committed Apr 7, 2020
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  4. Avoid extra &mut in Chain::fold and try_fold

    @cuviper
    cuviper committed Apr 7, 2020
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