Summary About this guide Getting started The library team Meetings Membership Reviewing Building and debugging libraries The feature lifecycle API Change Proposals Using tracking issues Stabilizing features Deprecating features Code considerations Design Public APIs When to add #[must_use] Breaking changes Breakage from changing behavior Breakage from new trait impls #[fundamental] types Breakage from changing the prelude Safety and soundness Generics and unsafe Drop and #[may_dangle] std::mem and exclusive references Using unstable language features Const generics Const evaluation Specialization Performance When to #[inline] Documentation doc alias policy safety comments policy how to write documentation reviewing doc changes Tools and bots @bors @rust-timer @craterbot