perf: Use `for_each` in `Vec::extend`#68046

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Marwes wants to merge 8 commits intorust-lang:masterfrom

Marwes:extend_for_each

Commits on Feb 6, 2020

Add extend_chain bench

Marwes
authored and
Markus Westerlind
committed
More chain in extend benchmark
Markus Westerlind
committed
Use a more complicated chain in benchmarks
Markus Westerlind
committed
perf: Use `for_each` in `Vec::extend`

Marwes
authored and
Markus Westerlind
committed
Use try_fold in Vec::extend
Markus Westerlind
committed
No by_ref
Markus Westerlind
committed
Avoid a closure in Vec::extend_desugared
Markus Westerlind
committed
Massage extend_desugared to reduce the compiletime impact
Markus Westerlind
committed