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## Summary Do not identify struct literals by searching for `:`. Instead define a sub- category of expressions which excludes struct literals and re-define `for`, `if`, and other expressions which take an expression followed by a block (or...
## Summary Remove localization features from format!, and change the set of escapes accepted by format strings. The `plural` and `select` methods would be removed, `#` would no longer need to be escaped, and `{{`/`}}` would become escapes f...
## Summary `Index` should be split into `Index` and `IndexMut`. ## Motivation Currently, the `Index` trait is not suitable for most array indexing tasks. The slice functionality cannot be replicated using it, and as a result the new `Vec` h...
## Summary Remove the coercion from `Box<T>` to `&mut T` from the language. ## Motivation Currently, the coercion between `Box<T>` to `&mut T` can be a hazard because it can lead to surprising mutation where it was not expected. ## Detailed...
## Summary Add syntax sugar for importing a module and items in that module in a single view item. ## Motivation Make use clauses more concise. ## Detailed design The `mod` keyword may be used in a braced list of modules in a `use` item to...
## Summary Rust currently forbids pattern guards on match arms with move-bound variables. Allowing them would increase the applicability of pattern guards. ## Motivation Currently, if you attempt to use guards on a match arm with a move-bou...
## Summary Add a `partial_cmp` method to `PartialOrd`, analogous to `cmp` in `Ord`. ## Motivation The `Ord::cmp` method is useful when working with ordered values. When the exact ordering relationship between two values is required, `cmp` i...
## Summary Allow users to load custom lints into `rustc`, similar to loadable syntax extensions. ## Motivation There are many possibilities for user-defined static checking: * Enforcing correct usage of Servo's [JS-managed pointers](https:/...
## Summary Simplify Rust's lexical syntax to make tooling easier to use and easier to define. ## Motivation Rust's lexer does a lot of work. It un-escapes escape sequences in string and character literals, and parses numeric literals of 4 d...
## Summary Generalize the `#[macro_registrar]` feature so it can register other kinds of compiler plugins. ## Motivation I want to implement [loadable lints](https://github.com/mozilla/rust/issues/14067) and use them for project-specific st...
## Summary Bounds on trait objects should be separated with `+`. ## Motivation With DST there is an ambiguity between the following two forms: trait X { fn f(foo: b); } and trait X { fn f(Trait: Share); } See Rust issue #12778 for details....
## Summary Allow macro expansion in patterns, i.e. ~~~ .rs match x { my_macro!() => 1, _ => 2, } ~~~ ## Motivation This is consistent with allowing macros in expressions etc. It's also a year-old [open issue](https://github.com/mozilla/rust...
## Summary Leave structs with unspecified layout by default like enums, for optimisation purposes. Use something like `#[repr(C)]` to expose C compatible layout. ## Motivation The members of a struct are always laid in memory in the order i...
## Summary Allow block expressions in statics, as long as they only contain items and a trailing const expression. Example: ```rust static FOO: uint = { 100 }; static BAR: fn() -> int = { fn hidden() -> int { 42 } hidden }; ``` ## Motivatio...
## Summary Add ASCII byte literals and ASCII byte string literals to the language, similar to the existing (Unicode) character and string literals. Before the RFC process was in place, this was discussed in [#4334](https://github.com/mozill...
## Summary Temporaries live for the enclosing block when found in a let-binding. This only holds when the reference to the temporary is taken directly. This logic should be extended to extend the cleanup scope of any temporary whose lifetim...
## Summary The rules about the places `mod foo;` can be used are tightened to only permit its use in a crate root and in `mod.rs` files, to ensure a more sane correspondence between module structure and file system hierarchy. Most notably,...
## Summary The tilde (`~`) operator and type construction do not support allocators and therefore should be removed in favor of the `box` keyword and a language item for the type. ## Motivation * There will be a unique pointer type in the s...
## Summary `StrBuf` should be renamed to `String`. ## Motivation Since `StrBuf` is so common, it would benefit from a more traditional name. ## Drawbacks It may be that `StrBuf` is a better name because it mirrors Java `StringBuilder` or C#...
## Summary Asserts are too expensive for release builds and mess up inlining. There must be a way to turn them off. I propose macros `debug_assert!` and `assert!`. For test cases, `assert!` should be used. ## Motivation Asserts are too expe...
"What I have been learning ... was not Rust in particular, but how to write sound software in general, and that in my opinion is the largest asset that..."