Improved the use of `Extend` in a few `Iterator` methods#65219

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Lucretiel wants to merge 7 commits intorust-lang:masterfrom Lucretiel:improved-unzip

+49-27

Commits on Oct 8, 2019

Improved the use of Extend in a few Iterator methods
Lucretiel
committed
Switched to local functions away from closures, per rust-lang#62429
Lucretiel
committed

Commits on Oct 9, 2019

Commits on Oct 10, 2019

Commits on Oct 11, 2019

Added fusion and right.extend to partition.
Lucretiel
committed