Structural conversion from anyhow errors #324

Job	Run time
Miri	1m 5s
Check (stable)	17s
Clippy (stable)	23s
Test Suite (stable)	39s
Rustfmt (stable)	12s
Test Suite (stable, --no-default-features)	38s
Test Suite	4m 40s
Test Suite (stable, --features track-caller)	38s
Test Suite (ubuntu-latest)	36s
Test Suite (--no-default-features)	4m 46s
Test Suite (windows-latest)	1m 54s
Test Suite (stable, --features pyo3)	38s
Test Suite (macOS-latest)	1m 44s
Test Suite (stable, --features auto-install)	37s
Test Suite (stable, --all-features)	39s
Test Suite (--features track-caller)	4m 24s
Test Suite (beta)	33s
Test Suite (beta, --no-default-features)	33s
Test Suite (beta, --features track-caller)	33s
Test Suite (--features auto-install)	4m 26s
Test Suite (beta, --features pyo3)	36s
Test Suite (beta, --features auto-install)	33s
Test Suite (beta, --all-features)	37s
Test Suite (nightly)	47s
Test Suite (nightly, --no-default-features)	43s
Test Suite (nightly, --features track-caller)	44s
Test Suite (nightly, --features pyo3)	46s
Test Suite (nightly, --features auto-install)	45s
Test Suite (nightly, --all-features)	45s
	36m 11s

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