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Use Vec::with_capacity(1) in a couple of places. #50762

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Use Vec::with_capacity(1) in a couple of places. #50762

wants to merge 1 commit into from

Commits on May 16, 2018

  1. Use Vec::with_capacity(1) in a couple of places. 

    Because Vec::new() + push() results in a capacity of 4, and these
particular vectors almost never grow past a length of 1.

This change reduces the number of bytes of heap allocation
significantly. (For serde it's a 15% reduction for a debug build.) This
didn't give noticeable speed-ups on my machine but it's a trivial change
and certainly can't hurt.
    @nnethercote
    nnethercote committed May 16, 2018
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