Fix static field collection #486

Job	Run time
rust_ci (macos-latest, stable)	56s
rust_ci (macos-latest, beta)	50s
rust_ci (macos-latest, nightly)	1m 20s
rust_ci (ubuntu-latest, stable)	49s
rust_ci (ubuntu-latest, beta)	49s
rust_ci (ubuntu-latest, nightly)	1m 25s
rust_ci (windows-latest, stable)	2m 21s
rust_ci (windows-latest, beta)	1m 33s
rust_ci (windows-latest, nightly)	3m 9s
	13m 12s

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