Remove public_in_private warning #300

Job	Run time
Test Suite	4m 14s
Test Suite (stable)	37s
Test Suite (--no-default-features)	4m 21s
Clippy (stable)	30s
Check (stable)	21s
Test Suite (stable, --no-default-features)	35s
Test Suite (--features track-caller)	4m 28s
Test Suite (stable, --features track-caller)	44s
Test Suite (--features auto-install)	4m 13s
Test Suite (stable, --features pyo3)	37s
Rustfmt (stable)	13s
Miri	1m 7s
Test Suite (stable, --features auto-install)	38s
Test Suite (ubuntu-latest)	37s
Test Suite (stable, --all-features)	42s
Test Suite (windows-latest)	1m 32s
Test Suite (beta)	36s
Test Suite (macOS-latest)	1m 1s
Test Suite (beta, --no-default-features)	33s
Test Suite (beta, --features track-caller)	32s
Test Suite (beta, --features pyo3)	39s
Test Suite (beta, --features auto-install)	38s
Test Suite (beta, --all-features)	33s
Test Suite (nightly)	48s
Test Suite (nightly, --no-default-features)	47s
Test Suite (nightly, --features track-caller)	42s
Test Suite (nightly, --features pyo3)	55s
Test Suite (nightly, --features auto-install)	43s
Test Suite (nightly, --all-features)	49s
	34m 45s

Provide feedback