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4 posts
Make a dependency optional and expose it as a feature, with dep: syntax to avoid implicit features. Cover cfg gating, testing every combination and the pitfalls of default features.
A feature enabled by any crate in your dependency graph is enabled for everyone using that crate. Learn how resolver 2 and 3 limit it, how to find who enabled what and rules for additive features.
Feature flags multiply build configurations. See the combinations that fail, how cargo hack tests them, and rules for additive features that keep builds safe.
A guide to Cargo beyond cargo build: the manifest, dependency versions, features, workspaces, profiles, MSRV, publishing and the errors you will meet along the way.