When Enabling One Cargo Feature Changes Another Dependency's Behavior
A diagnostic guide for Rust workspaces where enabling a feature in one crate silently changes another crate’s behavior through Cargo’s feature unification.
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A diagnostic guide for Rust workspaces where enabling a feature in one crate silently changes another crate’s behavior through Cargo’s feature unification.
The goal is to determine the exact boundary at which Cargo’s rebuild logic and rustc’s incremental state diverge, causing a stale artifact to be reused. Constraints include changes to the toolchain, RUSTFLAGS, dependency versions, and build‑script side effects that may not be fully captured by Cargo’s fingerprinting. The uncertainty lies in whether Cargo’s c