Simplify toolchain type hierarchy
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@rami3l is already working on this.
Since Sep 17, 2026.
enhancement
- Dominant language
- Rust
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Description
It feels to me like we have a lot of different "transition" and a whole bunch of supporting code, but we should use a small number of toolchain name types throughout the codebase and proactively resolve to these early/upfront.
It would be good to summarize the design of these and see if some of it can be flattened.
Originally posted by @djc in https://github.com/rust-lang/rustup/issues/5071#issuecomment-5711393546
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