Search within crate is broken: "Uncaught TypeError: crates is undefined"

[dtolnay]

https://docs.rs/syn/1.0.61/syn/?search=Expr fails to load, with the following in the JS console. In comparison, https://docs.rs/syn/1.0.60/syn/?search=Expr works fine as before. rust-lang/rust#82310 seems relevant. @jsha

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[jyn514]

Hmm, I rebuilt syn 1.0.61 after deploying #1301, but it didn't seem to help. I think the list of essential files might only be calculated once per toolchain version? I can rebuild it again after the next nightly to see if it helps.