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rust-lang.github.io
#3923
Feature Name: cargo_min_publish_age Start Date: 2026-02-23 RFC PR: rust-lang/rfcs#3923 Tracking Issue: rust-lang/cargo#17009 Summary This proposal adds a new configuration option to cargo allowing users to specify a minimum age for dependen...
Cargo 2026-06-24 ~17 min read
rust-lang.github.io
#3631
Rustdoc: stabilization of the doc(cfg*) attributes Features Name: doc_cfg Start Date: 2022-12-07 RFC PR: rust-lang/rfcs#3631 Rust Issue: rust-lang/rust#43781 Summary This RFC aims at providing rustdoc users the possibility to add visual mar...
Rustdoc 2025-10-01 ~9 min read
rust-lang.github.io
#3698
Feature Name: macro_derive Start Date: 2024-09-20 RFC PR: rust-lang/rfcs#3698 Rust Issue: rust-lang/rust#143549 Summary Support implementing derive(Trait) via a macro_rules! macro. Motivation Many crates support deriving their traits with d...
Compiler 2025-08-20 ~9 min read
rust-lang.github.io
#3697
Feature Name: macro_attr Start Date: 2024-09-20 RFC PR: rust-lang/rfcs#3697 Rust Issue: rust-lang/rust#143547 Summary Support defining macro_rules! macros that work as attribute macros. Motivation Many crates provide attribute macros. Today...
Compiler 2025-08-13 ~7 min read
rust-lang.github.io
#3624
Feature Name: supertrait_item_shadowing Start Date: 2024-05-04 RFC PR: rust-lang/rfcs#3624 Tracking Issue: rust-lang/rust#89151 Summary When method selection encounters an ambiguity between two trait methods when both traits are in scope, i...
Updates from the Rust Project 2025-02-19 ~4 min read
rust-lang.github.io
#3668
Feature Name: async_closure1 2 Start Date: 2024-06-25 RFC PR: rust-lang/rfcs#3668 Tracking Issue: rust-lang/rust#62290 Summary This RFC adds an async bound modifier to the Fn family of trait bounds. The combination currently desugars to a s...
Updates from the Rust Project 2024-12-18 ~26 min read
rust-lang.github.io
#3593
Feature Name: unprefixed_guarded_strings Start Date: 2024-03-24 RFC PR: rust-lang/rfcs#3593 Tracking Issue: rust-lang/rust#123735 Summary Beginning with the 2024 edition, reserve the syntax #"foo"#, as a way of future-proofing against futur...
Updates from the Rust Project 2024-10-16 ~3 min read
rust-lang.github.io
#3695
Feature Name: cfg_boolean_literals Start Date: 2024-09-16 RFC PR: rust-lang/rfcs#3695 Tracking Issue: rust-lang/rust#131204 Summary Allow true and false boolean literals as cfg predicates, i.e. cfg(true)/cfg(false). Motivation Often, we may...
Updates from the Rust Project 2024-10-09 ~2 min read
rust-lang.github.io
#3550
Feature Name: new_range Start Date: 2023-12-18 RFC PR: rust-lang/rfcs#3550 Tracking Issue: rust-lang/rust#123741 Summary Change the range operators a..b, a.., and a..=b to resolve to new types std::range::Range, std::range::RangeFrom, and s...
Updates from the Rust Project 2024-07-10 ~16 min read
rust-lang.github.io
#2289
Feature Name: associated_type_bounds Start Date: 2018-01-13 RFC PR: rust-lang/rfcs#2289 Rust Issue: rust-lang/rust#52662 Summary Introduce the bound form MyTrait<AssociatedType: Bounds>, permitted anywhere a bound of the form MyTrait<Associ...
Updates from the Rust Project 2024-03-20 ~4 min read
rust-lang.github.io
#3373
Feature Name: N/A Start Date: 2022-01-19 RFC PR: rust-lang/rfcs#3373 Tracking Issue: rust-lang/rust#120363 Summary Add a warn-by-default lint for items inside functions or expressions that implement methods or traits that are visible outsid...
Updates from the Rust Project 2024-02-28 ~2 min read
rust-lang.github.io
Rust API Guidelines
Rust API Guidelines This is a set of recommendations on how to design and present APIs for the Rust programming language. They are authored largely by the Rust library team, based on experiences building the Rust standard library and other...
Rust API Guidelines Book 2024-01-01 ~1 min read
rust-lang.github.io
Rust API Guidelines Checklist
Rust API Guidelines Checklist • Naming (crate aligns with Rust naming conventions) • [ ] Casing conforms to RFC 430 (C-CASE) • [ ] Ad-hoc conversions follow as_, to_, into_ conventions (C-CONV) • [ ] Getter names follow Rust convention (C-G...
Rust API Guidelines Book 2024-01-01 ~3 min read
rust-lang.github.io
Naming
Naming Casing conforms to RFC 430 (C-CASE) Basic Rust naming conventions are described in RFC 430. In general, Rust tends to use UpperCamelCase for "type-level" constructs (types and traits) and snake_case for "value-level" constructs. More...
Rust API Guidelines Book 2024-01-01 ~7 min read
rust-lang.github.io
Interoperability
Interoperability Types eagerly implement common traits (C-COMMON-TRAITS) Rust's trait system does not allow orphans: roughly, every impl must live either in the crate that defines the trait or the implementing type. Consequently, crates tha...
Rust API Guidelines Book 2024-01-01 ~7 min read
rust-lang.github.io
Macros
Macros Input syntax is evocative of the output (C-EVOCATIVE) Rust macros let you dream up practically whatever input syntax you want. Aim to keep input syntax familiar and cohesive with the rest of your users' code by mirroring existing Rus...
Rust API Guidelines Book 2024-01-01 ~3 min read
rust-lang.github.io
Documentation
Documentation Crate level docs are thorough and include examples (C-CRATE-DOC) See RFC 1687. All items have a rustdoc example (C-EXAMPLE) Every public module, trait, struct, enum, function, method, macro, and type definition should have an...
Rust API Guidelines Book 2024-01-01 ~6 min read
rust-lang.github.io
Predictability
Predictability Smart pointers do not add inherent methods (C-SMART-PTR) For example, this is why the Box::into_raw function is defined the way it is. impl<T> Box<T> where T: ?Sized { fn into_raw(b: Box<T>) -> *mut T { /* ... */ } } let boxe...
Rust API Guidelines Book 2024-01-01 ~5 min read
rust-lang.github.io
Flexibility
Flexibility Functions expose intermediate results to avoid duplicate work (C-INTERMEDIATE) Many functions that answer a question also compute interesting related data. If this data is potentially of interest to the client, consider exposing...
Rust API Guidelines Book 2024-01-01 ~5 min read
rust-lang.github.io
Type safety
Type safety Newtypes provide static distinctions (C-NEWTYPE) Newtypes can statically distinguish between different interpretations of an underlying type. For example, a f64 value might be used to represent a quantity in miles or in kilomete...
Rust API Guidelines Book 2024-01-01 ~5 min read
"If there’s a backdoor attack lurking in the crates ecosystem, then it’s lurking pretty deep at present. The popular crates that we all rely on day..."
— Adam Harvey on his blog

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