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The extra span is now recorded in the new `TokenKind::NtIdent` and `TokenKind::NtLifetime`. These both consist of a single token, and so there's no operator precedence problems with inserting them directly into the token stream. The other way to do this would be to wrap the ident/lifetime in invisible delimiters, but there's a lot of code that assumes an interpolated ident/lifetime fits in a single token, and changing all that code to work with invisible delimiters would have been a pain. (Maybe it could be done in a follow-up.) This change might not seem like much of a win, but it's a first step toward the much bigger and long-desired removal of `Nonterminal` and `TokenKind::Interpolated`. That change is big and complex enough that it's worth doing this piece separately. (Indeed, this commit is based on part of a late commit in #114647, a prior attempt at that big and complex change.)
This is the main source code repository for Rust. It contains the compiler, standard library, and documentation.
Why Rust?
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Performance: Fast and memory-efficient, suitable for critical services, embedded devices, and easily integrate with other languages.
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Reliability: Our rich type system and ownership model ensure memory and thread safety, reducing bugs at compile-time.
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Productivity: Comprehensive documentation, a compiler committed to providing great diagnostics, and advanced tooling including package manager and build tool (Cargo), auto-formatter (rustfmt), linter (Clippy) and editor support (rust-analyzer).
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Read "Installation" from The Book.
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Contributing
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License
Rust is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.
See LICENSE-APACHE, LICENSE-MIT, and COPYRIGHT for details.
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