# Pin the workspace to the nightly Rust toolchain. Nightly is the DEFAULT build
# path so that every adhoc `cargo` invocation — including per-crate commands an
# LLM/agent or developer issues like `cargo build -p choreo-x`, `cargo check -p
# x`, `cargo nextest run -p x` — automatically picks up the fast per-profile
# `-Z` compiler flags wired in via the nightly-only `profile-rustflags` feature
# (see the `[unstable]` block in .cargo/config.toml and the `rustflags` keys in
# the root Cargo.toml). Agent/adhoc commands get the fast build for free; they
# do not need to remember `+nightly` or RUSTFLAGS.
#
# `channel = "nightly"` tracks the latest nightly; if a nightly regression
# breaks the build, pin a date instead (e.g. nightly-2026-08-14).
#
# Building with STABLE Rust is an explicit, supported opt-out: the sources use
# no nightly-only features (MSRV floor is 1.94.1, see the root Cargo.toml), and
# `just build-stable` / `check-stable` / `test-stable` run one command on stable
# by temporarily stripping the nightly-only `profile-rustflags` bits that
# otherwise hard-block stable Cargo (see scripts/build-stable.sh).
[]
= "nightly"