A way for `cargo clean` to remove content for a specific toolchain version

[davemilter]

Looks like cargo can cache result of cargo build for different toolchains,
if I run cargo +stable build && cargo +nightly build && cargo +stable build with empty target
it build only two times, the second run of cargo +stable build does nothing.
This is great.
But if I run cargo +nightly clean the next run of cargo +stable build also run full rebuild.

It would be great if cargo +nightly build clean cache related only to nightly toolchain,
cargo +stable clean clean cache related only to stable toolchain and so on.

[stale]

As there hasn't been any activity here in over 6 months I've marked this as stale and if no further activity happens for 7 days I will close it.

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[dwijnand]

Related to #5026 ("cargo target fills will outdated artifacts as toolchains are updated/changed").

How would one go about changing clean so it only cleans artefacts relevant to the selected channel?

[Eh2406]

cargo sweep is adding this functionality.

[epage]

I don't think it'd make sense for cargo clean to only clean up for the toolchain being invoked but I could see the possibility of a flag. We'd need better tracking of what files are associated with what toolchain. #12633 is the most likely route for that.