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## Summary When calling `println!` it currently causes a panic if `stdout` does not exist. Change this to ignore this specific error and simply void the output. ## Motivation On Linux `stdout` almost always exists, so when people write game...
## Summary This RFC suggests stabilizing a reduced-scope `Duration` type that is appropriate for interoperating with various system calls that require timeouts. It does not stabilize a large number of conversion methods in `Duration` that h...
## Summary Add a function to the `std::process` module to exit the process immediately with a specified exit code. ## Motivation Currently there is no stable method to exit a program in Rust with a nonzero exit code without panicking. The c...
## Summary Custom coercions allow smart pointers to fully participate in the DST system. In particular, they allow practical use of `Rc<T>` and `Arc<T>` where `T` is unsized. This RFC subsumes part of [RFC 401 coercions](https://github.com/...
## Summary Restrict closure return type syntax for future compatibility. ## Motivation Today's closure return type syntax juxtaposes a type and an expression. This is dangerous: if we choose to extend the type grammar to be more acceptable,...
## Summary Rust's `Write` trait has the `write_all` method, which is a convenience method that writes a whole buffer, failing with `ErrorKind::WriteZero` if the buffer cannot be written in full. This RFC proposes adding its `Read` counterpa...
## Summary Make the `count` parameter of `SliceExt::splitn`, `StrExt::splitn` and corresponding reverse variants mean the *maximum number of items returned*, instead of the *maximum number of times to match the separator*. ## Motivation The...
## Summary Add the family of `[Op]Assign` traits to allow overloading assignment operations like `a += b`. ## Motivation We already let users overload the binary operations, letting them overload the assignment version is the next logical s...
## Summary Disallow hyphens in Rust crate names, but continue allowing them in Cargo packages. ## Motivation This RFC aims to reconcile two conflicting points of view. First: hyphens in crate names are awkward to use, and inconsistent with...
## Summary Replace `Entry::get` with `Entry::or_insert` and `Entry::or_insert_with` for better ergonomics and clearer code. ## Motivation Entry::get was introduced to reduce a lot of the boiler-plate involved in simple Entry usage. Two incr...
## Summary This RFC proposes to expand, and make more explicit, Rust's governance structure. It seeks to supplement today's core team with several *subteams* that are more narrowly focused on specific areas of interest. *Thanks to Nick Came...
## Summary Allow marking free functions and inherent methods as `const`, enabling them to be called in constants contexts, with constant arguments. ## Motivation As it is right now, `UnsafeCell` is a stabilization and safety hazard: the fie...
## Summary Move the contents of `std::thread_local` into `std::thread`. Fully remove `std::thread_local` from the standard library. ## Motivation Thread locals are directly related to threading. Combining the modules would reduce the number...
## Summary Add intrinsics for single-threaded memory fences. ## Motivation Rust currently supports memory barriers through a set of intrinsics, `atomic_fence` and its variants, which generate machine instructions and are suitable as cross-p...
## Summary Allow inherent implementations on types outside of the module they are defined in, effectively reverting [RFC PR 155](https://github.com/rust-lang/rfcs/pull/155). ## Motivation The main motivation for disallowing such `impl` bodi...
## Summary Support the `#[must_use]` attribute on arbitrary functions, to make the compiler lint when a call to such a function is ignored. Mark `PartialEq::{eq, ne}` `#[must_use]` as well as `PartialOrd::{lt, gt, le, ge}`. ## Motivation Th...
## Summary Lex binary and octal literals as if they were decimal. ## Motivation Lexing all digits (even ones not valid in the given base) allows for improved error messages & future proofing (this is more conservative than the current appro...
## Summary Pare back the `std::hash` module's API to improve ergonomics of usage and definitions. While an alternative scheme more in line with what Java and C++ have is considered, the current `std::hash` module will remain largely as-is w...
## Summary Stabilize all string functions working with search patterns around a new generic API that provides a unified way to define and use those patterns. ## Motivation Right now, string slices define a couple of methods for string manip...
## Summary Allow macros in type positions ## Motivation Macros are currently allowed in syntax fragments for expressions, items, and patterns, but not for types. This RFC proposes to lift that restriction. 1. This would allow macros to be u...
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