These keywords aren’t used yet, but they are reserved for future use. They have the same restrictions as strict keywords. The reasoning behind this is to make current programs forward compatible with …

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The other use of the impl keyword is in impl Trait syntax, which can be understood to mean “any (or some) concrete type that implements Trait”. It can be used as the type of a variable declaration, in …

The dyn keyword is used to highlight that calls to methods on the associated Trait are dynamically dispatched. To use the trait this way, it must be dyn compatible 1.

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Many programming languages have much in common at their core. None of the concepts presented in this chapter are unique to Rust, but we’ll discuss them in the context of Rust and explain the …

The Rust Programming Language Fundamentals of Asynchronous Programming: Async, Await, Futures, and Streams Many operations we ask the computer to do can take a while to finish. It would be nice …

A - Keywords Appendix A: Keywords The following list contains keywords that are reserved for current or future use by the Rust language. As such, they cannot be used as identifiers (except as raw …

Productivity: Comprehensive documentation, a compiler committed to providing great diagnostics, and advanced tooling including package manager and build tool (Cargo), auto-formatter (rustfmt), linter …

The keyword pub makes any module, function, or data structure accessible from inside of external modules. The pub keyword may also be used in a use declaration to re-export an identifier from a …