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Fix `mdbook serve` unexpected panic #1531

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Run time

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Job	Run time
Rustfmt	6s
Test (stable)	4m 5s
Test (beta)	3m 52s
Test (nightly)	3m 22s
Test (macos)	3m 27s
Test (windows)	7m 39s
Test (msrv)	7m 57s
Success gate	1s
	30m 29s