Rust

Merge pull request #601 from philipc/elf-def #837

Job	Run time
doc	15s
coverage	1m 35s
cross (i686-unknown-linux-gnu)	1m 36s
build (ubuntu-latest, stable)	1m 17s
cross (powerpc64-unknown-linux-gnu)	1m 41s
build (ubuntu-latest, beta)	1m 10s
features	37s
msrv-all	4m 20s
build (ubuntu-latest, nightly)	1m 18s
build (stable, macOS-latest)	3m 25s
msrv-read	4m 12s
rustfmt	11s
	21m 37s

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