C: declare MSRV rust-version = "1.85" in Cargo.toml

[Mec-iS]

Tracking issue: — Bump Rust edition to 2024 + adopt relative idioms.

Scope

Declare the Minimum Supported Rust Version (MSRV) in Cargo.toml. Edition 2024 stabilized in Rust 1.85 (Feb 2025); the repo toolchain is 1.94+, so it builds locally and on CI. Declaring the MSRV is honest about the breaking implication for downstream consumers of the published crate (fine for 0.x).

Tasks

• Add rust-version = "1.85" to Cargo.toml [package].
• Note the MSRV in CHANGELOG.md.

Verification

• cargo build --all-features passes on the declared MSRV (CI stable ≥ that).
• cargo fmt --all -- --check
• cargo clippy --all-features -- -Drust-2018-idioms -Dwarnings
• cargo test --all-features

Do you want to work on this issue?

yes — PR targets development.

[Mec-iS]

Delivered in PR #406 (merged). rust-version = "1.85" declared in Cargo.toml, and a new msrv CI job builds with dtolnay/rust-toolchain@1.85.0 (--all-features and no-features) to verify the claim. Also added [lints.rust] unexpected_cfgs check-cfg table for cfg(coverage, coverage_nightly) and cfg(tarpaulin). MSRV verified locally: cargo +1.85.0 build --all-features = 0.