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Fix `mdbook serve` unexpected panic #1533

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Run time

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Job	Run time
Rustfmt	6s
Test (stable)	3m 37s
Test (beta)	1m 56s
Test (nightly)	1m 56s
Test (macos)	3m 54s
Test (windows)	4m 29s
Test (msrv)	5m 22s
Success gate	1s
	21m 21s