Cargo Reference The reference covers the details of various areas of Cargo. The Manifest Format Cargo Targets Rust version Workspaces Specifying Dependencies Overriding Dependencies Source Replacement Dependency Resolution Features Features Examples Profiles Configuration Environment Variables Build Scripts Build Script Examples Build Cache Package ID Specifications External Tools Registries Registry Authentication Credential Provider Protocol Running a Registry Registry Index Registry Web API SemVer Compatibility Future incompat report Reporting build timings Lints Unstable Features