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Fix `mdbook serve` unexpected panic #1530

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Run time

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Job	Run time
Rustfmt	5s
Test (stable)	3m 37s
Test (beta)	2m 56s
Test (nightly)	2m 49s
Test (macos)	2m 36s
Test (windows)	6m 33s
Test (msrv)	10m 47s
Success gate	4s
	29m 27s