mise-lang-rust-cargo

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name: mise-lang-rust-cargo description: The cargo ecosystem — cargo vs mise's cargo: backend for installing CLIs (prefer aqua over cargo build-from-source for ripgrep/fd/bat/etc.), sccache for compile caching, cargo-nextest as a test runner, cargo workspaces, and when to pin rustc exact vs channel. Use when working with cargo deps or CLIs.

Cargo ecosystem — what belongs where

Cargo is both a package manager and a build system. mise's job is to pin rustc/cargo; cargo's job is to manage dependencies and build artifacts. The interesting decisions are about which Rust CLIs to install via mise vs cargo vs aqua.

The cargo install trap

New Rust users reach for cargo install ripgrep. It works. It's also:

1. Slow — builds from source (minutes per tool).
2. Not pinned — $HOME/.cargo/bin/rg is whatever version you last installed.
3. Not reproducible — teammates get different versions.
4. Requires a full Rust toolchain — even if you only want the binary.

Never use cargo install for tools that exist as pre-built binaries on GitHub. Use aqua instead.

The decision matrix

CLI	Install via	Why
ripgrep	aqua:BurntSushi/ripgrep	Pre-built, fast, pinned
fd	aqua:sharkdp/fd	Pre-built
bat	aqua:sharkdp/bat	Pre-built
eza	aqua:eza-community/eza	Pre-built
just	aqua:casey/just	Pre-built
cargo-nextest	aqua:nextest-rs/nextest	Pre-built
cargo-watch	cargo:cargo-watch	Not published as a GitHub release; fallback to cargo backend
cargo-<your-own-tool>	cargo:path-to-your-crate	Not on aqua
Your team's internal CLI	cargo:github.com/your-org/your-tool	Private; aqua doesn't apply

Rule: check mise registry <tool> first. If aqua is available, use it. Only fall back to cargo: for tools that genuinely aren't published as binaries.

sccache — the ccache for Rust

Cargo's compile times are legendary. sccache caches rustc output and gives you massive speedups on incremental and cold builds.

[tools]
rust = "1.83"
"aqua:mozilla/sccache" = "latest"

[env]
RUSTC_WRAPPER = "sccache"
SCCACHE_DIR = "{{config_root}}/.cache/sccache"
SCCACHE_CACHE_SIZE = "10G"

Verify it's working:

sccache --show-stats
# after a build:
#   Compile requests               492
#   Cache hits                     425
#   Cache hits (Rust)              425

High hit rate (>80%) on incremental builds is normal. CI benefit is even bigger — cache the SCCACHE_DIR between runs.

cargo-nextest — the test runner

cargo test is fine. cargo nextest run is faster, has better output, and parallelizes more aggressively.

[tools]
rust = "1.83"
"aqua:nextest-rs/nextest" = "latest"

[tasks.test]
run = "cargo nextest run --all-features"

[tasks."test:slow"]
run = "cargo nextest run --all-features --run-ignored=only"

Rule of thumb: if you have more than ~50 tests, nextest's speedup is worth it.

Workspaces

Cargo workspaces share a Cargo.lock and a target/ dir across multiple crates in one repo:

myproject/
├── Cargo.toml       # workspace root
├── Cargo.lock
├── target/          # shared build dir
├── crates/
│   ├── core/
│   │   └── Cargo.toml
│   ├── cli/
│   │   └── Cargo.toml
│   └── server/
│       └── Cargo.toml

# Cargo.toml (workspace root)
[workspace]
resolver = "2"
members = ["crates/*"]

[workspace.dependencies]
serde = { version = "1", features = ["derive"] }
tokio = { version = "1", features = ["full"] }

[workspace.package]
rust-version = "1.83"
edition = "2021"

Individual crate Cargo.toml references the workspace:

[package]
name = "myproject-core"
version.workspace = true
edition.workspace = true
rust-version.workspace = true

[dependencies]
serde.workspace = true

mise.toml for a workspace:

[tools]
rust = "1.83"
"aqua:nextest-rs/nextest" = "latest"
"aqua:mozilla/sccache" = "latest"

[env]
RUSTC_WRAPPER = "sccache"
SCCACHE_DIR = "{{config_root}}/.cache/sccache"

[tasks.build]
run = "cargo build --workspace"

[tasks.test]
run = "cargo nextest run --workspace --all-features"

[tasks.lint]
run = "cargo clippy --workspace --all-targets --all-features -- -D warnings"

[tasks.fmt]
run = "cargo fmt --all"

Pinning rustc — channel vs exact

• rust = "stable" — follows whatever stable is. Lowest maintenance; you implicitly adopt every new release.
• rust = "1.83" — pinned to 1.83.x (latest patch). Good balance.
• rust = "1.83.0" — exact. Reproducible to the bit. Use for services where you want CI and prod to match exactly.

MSRV (Minimum Supported Rust Version) belongs in Cargo.toml's rust-version, not mise. They're different fields answering different questions:

• rust-version in Cargo.toml: "this crate needs at least this rustc" — a constraint.
• rust in mise.toml: "this project develops with this rustc" — a pin.

cargo features — conventional choices

# Cargo.toml
[features]
default = ["std"]
std = []
tokio-runtime = ["dep:tokio"]
tls = ["dep:rustls"]
full = ["std", "tokio-runtime", "tls"]

In mise tasks, pass features explicitly to avoid feature-unification surprises:

[tasks.test]
run = "cargo nextest run --all-features"

[tasks."test:no-default"]
run = "cargo nextest run --no-default-features"

cross-compilation

[tools]
rust = "1.83"
"aqua:cross-rs/cross" = "latest"

[tasks."build:arm64"]
run = "cross build --target aarch64-unknown-linux-gnu --release"

cross uses Docker to give you the right C toolchain per target. mise pins cross itself; cross handles the cross-compile complexity.

Anti-patterns

• cargo install ripgrep (see above — use aqua).
• Committing target/ — no. It's huge.
• Not committing Cargo.lock for applications. Libraries can skip it; apps can't.
• Using cargo watch without cargo-watch installed — install it first (the cargo: backend is fine for this one).
• [workspace.dependencies] + per-crate version = "1.2" — redundant; use .workspace = true instead.
• Using nightly without a date pin — pin dated nightlies (nightly-2026-04-01).

See also

• mise-lang-rust-overview — rust-toolchain.toml, channels, components.
• mise-backends-overview — aqua vs cargo vs other backends.
• mise-ci-github-actions — caching target/ and SCCACHE_DIR in CI.
• cargo book: doc.rust-lang.org/cargo/.
• nextest: nexte.st.
• sccache: github.com/mozilla/sccache.