Rust

Merge pull request #3353 from jlebon/pr/composefs-maybe #2329

Job	Run time
build-no-features	1m 40s
build-git-libostree	3m 2s
build	2m 8s
Build, minimum supported toolchain (MSRV)	1m 43s
cargo-deny	21s
	8m 54s

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