Move rebuild_vec into a method #523

Job	Run time
miri	7m 52s
minrust	2m 14s
cross (i686-unknown-linux-gnu)	29s
loom	2m 30s
cross (armv7-unknown-linux-gnueabihf)	34s
nightly	3m 22s
cross (powerpc-unknown-linux-gnu)	30s
rustfmt	5s
cross (powerpc64-unknown-linux-gnu)	33s
stable (ubuntu-latest)	1m 7s
cross (wasm32-unknown-unknown)	10s
stable (macos-latest)	1m 29s
tsan	2m 43s
stable (windows-latest)	1m 58s
Publish Documentation	2m 7s
	27m 43s

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