Structural conversion from anyhow errors #341

Job	Run time
Miri	1m 7s
Clippy (stable)	27s
Rustfmt (stable)	14s
Check (stable)	17s
Test Suite (stable)	38s
Test Suite	1m 11s
Test Suite (stable, --no-default-features)	35s
Test Suite (ubuntu-latest)	37s
Test Suite (--no-default-features)	1m 8s
Test Suite (stable, --features track-caller)	35s
Test Suite (windows-latest)	1m 45s
Test Suite (--features track-caller)	1m 12s
Test Suite (stable, --features pyo3)	41s
Test Suite (macOS-latest)	1m 41s
Test Suite (--features auto-install)	1m 11s
Test Suite (stable, --features auto-install)	36s
Test Suite (stable, --all-features)	41s
Test Suite (beta)	35s
Test Suite (beta, --no-default-features)	38s
Test Suite (beta, --features track-caller)	34s
Test Suite (beta, --features pyo3)	35s
Test Suite (beta, --features auto-install)	34s
Test Suite (beta, --all-features)	40s
Test Suite (nightly)	43s
Test Suite (nightly, --no-default-features)	48s
Test Suite (nightly, --features track-caller)	43s
Test Suite (nightly, --features pyo3)	47s
Test Suite (nightly, --features auto-install)	45s
Test Suite (nightly, --all-features)	46s
	22m 44s

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