Move rebuild_vec into a method #525

Job	Run time
minrust	2m 18s
rustfmt	3s
cross (i686-unknown-linux-gnu)	30s
nightly	3m 17s
cross (armv7-unknown-linux-gnueabihf)	27s
stable (ubuntu-latest)	1m 8s
cross (powerpc-unknown-linux-gnu)	31s
stable (macos-latest)	3m 5s
tsan	2m 44s
cross (powerpc64-unknown-linux-gnu)	27s
loom	2m 19s
stable (windows-latest)	1m 56s
cross (wasm32-unknown-unknown)	7s
miri	7m 57s
Publish Documentation	2m 20s
	29m 9s

Provide feedback