Automatically convert to external errors w/ ensure! and bail! (#95) #317

Job	Run time
Test Suite (ubuntu-latest)	36s
Test Suite (stable)	36s
Test Suite (windows-latest)	1m 16s
Check (stable)	16s
Test Suite (stable, --no-default-features)	35s
Clippy (stable)	29s
Test Suite (macOS-latest)	1m 41s
Test Suite (stable, --features track-caller)	41s
Test Suite (stable, --features pyo3)	42s
Rustfmt (stable)	11s
Miri	1m 7s
Test Suite (stable, --features auto-install)	36s
Test Suite (stable, --all-features)	40s
Test Suite (beta)	33s
Test Suite (beta, --no-default-features)	37s
Test Suite	4m 17s
Test Suite (beta, --features track-caller)	35s
Test Suite (--no-default-features)	4m 22s
Test Suite (beta, --features pyo3)	36s
Test Suite (--features track-caller)	4m 19s
Test Suite (beta, --features auto-install)	34s
Test Suite (--features auto-install)	4m 25s
Test Suite (beta, --all-features)	42s
Test Suite (nightly)	43s
Test Suite (nightly, --no-default-features)	45s
Test Suite (nightly, --features track-caller)	45s
Test Suite (nightly, --features pyo3)	48s
Test Suite (nightly, --features auto-install)	49s
Test Suite (nightly, --all-features)	49s
	35m 5s

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