Fix rust-mode lazy loading #242

Job	Run time
test (ubuntu-latest, 27.2)	3m 24s
test (ubuntu-latest, 28.2)	2m 56s
test (ubuntu-latest, 29.1)	1m 48s
test (ubuntu-latest, 29.2)	1m 53s
test (macos-latest, 27.2)	7m 47s
test (macos-latest, 28.2)	5m 10s
test (macos-latest, 29.1)	4m 4s
test (macos-latest, 29.2)	3m 56s
test (windows-latest, 27.2)	4m 21s
test (windows-latest, 28.2)	3m 35s
test (windows-latest, 29.1)	2m 12s
test (windows-latest, 29.2)	3m 27s
test (ubuntu-latest, snapshot, true)	1m 54s
test (macos-latest, snapshot, true)	3m 42s
	50m 9s

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