We should mark parent class' field reachable #565

Job	Run time
rust_ci (macos-latest, beta)	45s
rust_ci (macos-latest, stable)	45s
rust_ci (ubuntu-latest, stable)	36s
rust_ci (macos-latest, nightly)	29s
rust_ci (windows-latest, beta)	29s
rust_ci (windows-latest, stable)	29s
rust_ci (ubuntu-latest, beta)	36s
rust_ci (ubuntu-latest, nightly)	29s
rust_ci (windows-latest, nightly)	29s
	5m 7s

Provide feedback