abstract-return-types api-evolution argument-lifetimes associated-items async-trait build-systems cargo-prepublish cmp-ops-amendment cmp-ops-reform coercions collections-conventions conventions-galore conversion-traits custom-preludes deref-coercions epochs error-chaining-fixup error-chaining error-conventions-2 error-conventions-3 error-conventions expand-impl-trait explicate-gates extension-trait-conventions finalizing-naming-conventions future futures impl-specialization impl-trait-edits io-deadlines io-env io-fs io-fs2.1-tweaks io-os-reform io-process io-reader-writer io-simplification io-string-handling lifetime-elision lifetime-to-scope master no-module-prefixes north-star-edits-2 north-star-edits-3 north-star-edits num-reform ownership-variants-followup ownership-variants panic path-clarity path-reform prelude-additions remove-runtime remove-virtual-structs roadmap-2017 roadmap-2018 rust-governance rust-lang-crates scenarios scoped-take-2 show-string-guidelines slice-notation socket-timeouts stabilize-catch-panic uninit-memory-policy unsafe-api-location