Rust

Cleanup example. #174

Job	Run time
test (nasm, i686-unknown-linux-gnu)	1m 43s
test (nasm, x86_64-unknown-linux-gnu)	1m 8s
test (nasm, armv7-unknown-linux-gnueabihf)	1m 16s
test (nasm, x86_64-apple-darwin)	54s
test (nasm, aarch64-apple-darwin)	1m 1s
test (nasm, i686-pc-windows-msvc)	1m 47s
test (nasm, x86_64-pc-windows-msvc)	1m 58s
test (nasm, aarch64-pc-windows-msvc)	1m 51s
test (no-nasm, i686-unknown-linux-gnu)	53s
test (no-nasm, x86_64-unknown-linux-gnu)	49s
test (no-nasm, armv7-unknown-linux-gnueabihf)	55s
test (no-nasm, x86_64-apple-darwin)	1m 17s
test (no-nasm, aarch64-apple-darwin)	1m 42s
test (no-nasm, i686-pc-windows-msvc)	1m 52s
test (no-nasm, x86_64-pc-windows-msvc)	1m 40s
test (no-nasm, aarch64-pc-windows-msvc)	1m 55s
test (aarch64-unknown-linux-gnu, ubuntu-latest, gcc-aarch64-linux-gnu g++-aarch64-linux-gnu, true)	1m 5s
	23m 46s

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