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The "installed" and "toolchains" modes do rely on rustup at the moment. The others do not. I would love to see it have graceful fallback to using rustc directly. A PR is wellcome!
Skimming the code the only places we rely on rustup are:
Where we use it to determine the available rustc toolchains. This could return a sentinel value if rustup is not available.
Where we use the
@holmgr, can we add a