Rust

Merge pull request #3099 from markmc/man-sysroot-readonly #1765

Job	Run time
build	1m 59s
Build, minimum supported toolchain (MSRV)	1m 15s
build-git-libostree	3m 0s
build-no-features	1m 18s
cargo-deny	20s
	7m 52s

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