Rust

Merge pull request #94 from oschwald/greg/option #169

Job	Run time
Lints	15s
Check (ubuntu-latest, stable)	19s
Check (ubuntu-latest, nightly)	20s
Check (ubuntu-latest, beta)	17s
Check (macos-latest, beta)	22s
Test Suite (ubuntu-latest, nightly)	33s
Check (windows-latest, beta)	59s
Check (macos-latest, stable)	14s
Check (macos-latest, nightly)	22s
Test Suite (ubuntu-latest, stable)	30s
Test Suite (macos-latest, beta)	39s
Test Suite (ubuntu-latest, beta)	37s
Check (windows-latest, nightly)	1m 2s
Test Suite (windows-latest, nightly)	1m 32s
Test Suite (macos-latest, nightly)	35s
Test Suite (windows-latest, beta)	1m 34s
Check (windows-latest, stable)	1m 10s
Test Suite (windows-latest, stable)	1m 37s
Test Suite (macos-latest, stable)	27s
	13m 24s

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