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## Summary [summary]: #summary Allow `#[repr(transparent)]` on `union`s and univariant `enum`s that have exactly one non-zero-sized field (just like `struct`s). ## Motivation [motivation]: #motivation Some `union` types are thin newtype-sty...
## Summary [summary]: #summary Extend the `#[link]` attribute by adding a new kind `kind="raw-dylib"` for use on Windows which emits idata sections for the items in the attached `extern` block, so they may be linked against without linking...
## Summary [summary]: #summary This RFC proposes a new mangling scheme that describes what the symbol names generated by the Rust compiler look like. This new scheme has a number of advantages over the existing one which has grown over time...
## Summary [summary]: #summary This RFC proposes to stabilize the library component for the [first-class `async`/`await` syntax][companion RFC]. In particular, it would stabilize: - All APIs of the `std`-level task system, i.e. `std::task::...
## Summary [summary]: #summary No longer treat the body of an `unsafe fn` as being an `unsafe` block. To avoid a breaking change, this is a warning now and may become an error in a future edition. ## Motivation [motivation]: #motivation Mar...
## Summary [summary]: #summary Introduce new variants of the `&` operator: `&raw mut <place>` to create a `*mut <T>`, and `&raw const <place>` to create a `*const <T>`. This creates a raw pointer directly, as opposed to the already existing...
## Summary [summary]: #summary Add generic APIs that allow manipulating the metadata of fat pointers: * Naming the metadata’s type (as an associated type) * Extracting metadata from a pointer * Reconstructing a pointer from a data pointer a...
## Summary [summary]: #summary Allow attributes in formal function parameter position. For example, consider a Jax-Rs-style HTTP API: ```rust #[resource(path = "/foo/bar")] impl MyResource { #[get("/person/:name")] fn get_person( &self, #[p...
## Summary [summary]: #summary Many of the benefits of linked lists rely on the fact that most operations (insert, remove, split, splice etc.) can be performed in constant time once one reaches the desired element. To take advantage of this...
## Summary [summary]: #summary This RFC allows using SIMD types in C FFI. ## Motivation [motivation]: #motivation The architecture-specific SIMD types provided in [`core::arch`] cannot currently be used in C FFI. That is, Rust programs cann...
## Summary [summary]: #summary Adds a *"Future possibilities"* section to the `0000-template.md` RFC template that asks authors to elaborate on what natural extensions there might to their RFC and what future directions this may take the pr...
## Summary [summary]: #summary Extend Rust's pattern matching exhaustiveness checks to cover the integer types: `u8`, `u16`, `u32`, `u64`, `u128`, `usize`, `i8`, `i16`, `i32`, `i64`, `i128`, `isize` and `char`. ```rust fn matcher_full(x: u8...
## Summary [summary]: #summary Change `cfg_attr` to allow multiple attributes after the configuration predicate, instead of just one. When the configuration predicate is true, replace the attribute with all following attributes. ## Motivati...
## Summary [summary]: #summary Allow `|` to be arbitrarily nested within a pattern such that `Some(A(0) | B(1 | 2))` becomes a valid pattern. ## Motivation [motivation]: #motivation Nothing this RFC proposes adds anything with respect to ex...
## Summary [summary]: #summary [RFC 192]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md#defaults [Resolve][changes] the design of associated type defaults, first introduced in [RFC 192], such that provided meth...
## Summary [summary]: #summary Extend struct update syntax (a.k.a. functional record update (FRU)) to support instances of the *same* struct that have different types due to generic type or lifetime parameters. Fields of different types mus...
## Summary [summary]: #summary Allow assigning constants to `_`, as in `const _: TYPE = VALUE`, analogous to `let _ = VALUE`. ## Motivation [motivation]: #motivation The ability to ensure that code type checks while discarding the result is...
"This is a common theme in Rust’s design: To reduce breakage as code evolves, you’re only allowed to rely on features that have been intentionally ..."