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## Summary Add the syntax `..` for `std::ops::RangeFull`. ## Motivation Range expressions `a..b`, `a..` and `..b` all have dedicated syntax and produce first-class values. This means that they will be usable and useful in custom APIs, so fo...
## Summary Rename the `be` reserved keyword to `become`. ## Motivation A keyword needs to be reserved to support guaranteed tail calls in a backward-compatible way. Currently the keyword reserved for this purpose is `be`, but the `become` a...
## Summary The `Debug` trait is intended to be implemented by every type and display useful runtime information to help with debugging. This RFC proposes two additions to the fmt API, one of which aids implementors of `Debug`, and one which...
## Summary Make `Self` a keyword. ## Motivation Right now, `Self` is just a regular identifier that happens to get a special meaning inside trait definitions and impls. Specifically, users are not forbidden from defining a type called `Self...
## Summary Make `CString` dereference to a token type `CStr`, which designates null-terminated string data. ```rust // Type-checked to only accept C strings fn safe_puts(s: &CStr) { unsafe { libc::puts(s.as_ptr()) }; } fn main() { let s = C...
## Summary Rename (maybe one of) the standard collections, so as to make the names more consistent. Currently, among all the alternatives, renaming `BinaryHeap` to `BinHeap` is the slightly preferred solution. ## Motivation In [this comment...
## Summary Replace `Vec::drain` by a method that accepts a range parameter. Add `String::drain` with similar functionality. ## Motivation Allowing a range parameter is strictly more powerful than the current version. E.g., see the following...
## Summary Feature gate unused attributes for backwards compatibility. ## Motivation Interpreting the current backwards compatibility rules strictly, it's not possible to add any further language features that use new attributes. For exampl...
## Summary Remove official support for the `ndebug` config variable, replace the current usage of it with a more appropriate `debug_assertions` compiler-provided config variable. ## Motivation The usage of 'ndebug' to indicate a release bui...
## Summary A [recent RFC](https://github.com/rust-lang/rfcs/pull/504) split what was previously `fmt::Show` into two traits, `fmt::Show` and `fmt::String`, with format specifiers `{:?}` and `{}` respectively. That RFC did not, however, esta...
## Summary Remove chaining of comparison operators (e.g. `a == b == c`) from the syntax. Instead, require extra parentheses (`(a == b) == c`). ## Motivation ```rust fn f(a: bool, b: bool, c: bool) -> bool { a == b == c } ``` This code is cu...
## Summary Establish a convention throughout the core libraries for unsafe functions constructing references out of raw pointers. The goal is to improve usability while promoting awareness of possible pitfalls with inferred lifetimes. ## Mo...
## Summary Change pattern matching on an `&mut T` to `&mut <pat>`, away from its current `&<pat>` syntax. ## Motivation Pattern matching mirrors construction for almost all types, *except* `&mut`, which is constructed with `&mut <expr>` but...
## Summary 1. Remove the `Sized` default for the implicitly declared `Self` parameter on traits. 2. Make it "object unsafe" for a trait to inherit from `Sized`. ## Motivation The primary motivation is to enable a trait object `SomeTrait` to...
## Summary * Remove the `std::c_vec` module * Move `std::c_str` under a new `std::ffi` module, not exporting the `c_str` module. * Focus `CString` on *Rust-owned* bytes, providing a static assertion that a pile of bytes has no interior nuls...
## Summary Rename the `#[deriving(Foo)]` syntax extension to `#[derive(Foo)]`. ## Motivation Unlike our other verb-based attribute names, "deriving" stands alone as a present participle. By convention our attributes prefer "warn" rather tha...
## Summary Statically enforce that the `std::fmt` module can only create valid UTF-8 data by removing the arbitrary `write` method in favor of a `write_str` method. ## Motivation Today it is conventionally true that the output from macros l...
## Summary This RFC proposes that we rename the pointer-sized integer types `int/uint`, so as to avoid misconceptions and misuses. After extensive community discussions and several revisions of this RFC, the finally chosen names are `isize/...
## Summary Future-proof the allowed forms that input to an MBE can take by requiring certain delimiters following NTs in a matcher. In the future, it will be possible to lift these restrictions backwards compatibly if desired. ## Key Termin...
## Summary Stabilize the `std::prelude` module by removing some of the less commonly used functionality of it. ## Motivation The prelude of the standard library is included into all Rust programs by default, and is consequently quite an imp...
"_Captain's log, day 21_
We have sailed on Reddit and Twitter for three weeks now, searching far and wide, yet the only thing we found was a barren la..."