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Quentin Gliech
66e73f9910
Until now only the clippy CI job and the Dockerfile named a Rust version (kept in sync by hand), while every other CI job, the release binaries and the docs build ran on whatever `stable` happened to be that day. Rust 1.98.0 landing on 2026-08-20 broke `build-binaries` overnight because of that (#5935). `rust-toolchain.toml` pins 1.96.0 with the `minimal` profile plus clippy, and every `rustup toolchain install stable ...` in CI becomes a bare `rustup toolchain install`, which reads the file. Starting at 1.96.0 (the version clippy is already clean against) keeps this change free of lint churn; catching up to 1.98.0 is a follow-up. rustfmt stays on nightly because `.rustfmt.toml` uses nightly-only options, so that job now invokes `cargo +nightly fmt` explicitly instead of setting a rustup directory override, which would silently take precedence over the toolchain file. The file does not list the linux cross-compilation targets on purpose: that would make every developer and CI job download `rust-std` they never use. The two consumers that cross-compile add the targets themselves.