rust-lang / rust-lang/rustup

Please support a "system" toolchain

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O-linux
Dominant language
Rust
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Description

I'd like to be able to test things using my system-installed version of Rust, and also use nightly Rust via rustup. To support this, I'd love to have support in rustup for a "system" toolchain, which would allow cargo +system, or setting system as the default and using cargo +nightly.

When using the "system" toolchain, the various rustup-managed binaries would simply forward to the corresponding system binaries.

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Research direction

Start from the requested behaviors: cargo +system, a system default, and cargo +nightly; then trace rustup's toolchain-selection and binary-forwarding entry points. Done means system-installed Rust binaries are used for system while rustup-managed toolchains, including nightly, remain selectable.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
devtools
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
32/100

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