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as I'm attempting to upgrade the version of Rust used in scie-pants, I keep running into an issue with building the pants engine (as part of a scie-pants test), due to what seems to be rustup not respecting the requested toolchain in the pants sources..? any extra eyes for input would be appreciated: <https://github.com/pantsbuild/scie-pants/actions/runs/8328735688/job/22789400876#step:8:228>
<https://github.com/pantsbuild/scie-pants/pull/358/files>

I'm trying to figure out how it builds the engine, the rust-toolchain.toml is only used in some scenarios.

Try adding `rustup show`, it should print which toolchains are in play and where they are configured

It’s done as part of the pants bootstrap script..
The actual build is command is here: <https://github.com/pantsbuild/pants/blob/e2940014b99ac0c49428788bb182584e2a654cd0/build-support/bin/rust/bootstrap_code.sh#L42-L46>

I tried adding the `rustup show` in the test.. but the output doesn't seem to make the whole way..