Use the following command to bench:
% rustup override set nightly
% cargo bench% cargo bench
running 2 tests
test tests::bench_cast ... bench: 175,998 ns/iter (+/- 79,679)
test tests::bench_fract ... bench: 157,540 ns/iter (+/- 26,664)
test result: ok. 0 passed; 0 failed; 0 ignored; 2 measured; 0 filtered out
% cargo bench
running 2 tests
test tests::bench_cast ... bench: 173,530 ns/iter (+/- 44,183)
test tests::bench_fract ... bench: 172,032 ns/iter (+/- 47,314)
test result: ok. 0 passed; 0 failed; 0 ignored; 2 measured; 0 filtered out
% cargo bench
running 2 tests
test tests::bench_cast ... bench: 172,118 ns/iter (+/- 63,072)
test tests::bench_fract ... bench: 181,475 ns/iter (+/- 55,781)
test result: ok. 0 passed; 0 failed; 0 ignored; 2 measured; 0 filtered out