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Fix `mdbook serve` unexpected panic #1553

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Run time

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Job	Run time
Test (stable)	1m 56s
Test (beta)	2m 17s
Rustfmt	13s
Test (nightly)	1m 52s
Test (macos)	4m 5s
Test (windows)	3m 49s
Test (msrv)	5m 59s
Success gate	1s
	20m 12s