Sourced from syn's releases.

1.0.4

• Fix size_hint of Punctuated iterators (#700, thanks @​ExpHP)

1.0.3

• Add Path::get_ident (#696, thanks @​infinity0)

1.0.2

• Documentation improvements

1.0.1

• Add LitInt::base10_parse to produce error that has the right span when parsing literal digits

1.0.0

Syn is a library for parsing Rust code, largely geared toward use in procedural macros but generally applicable as a Rust parser outside of that too.

Syn was originally a sidequest on the effort to making Serde's derive macros work on stable Rust in 2016, but has since taken off as a foundational library in its own right. These days it appears in support of diverse use cases like:

• convenient interop between Rust-based Wasm modules and JavaScript,
• easy command line interfaces,
• a polished async experience, and
• a concurrency framework for embedded real time systems.

Excitingly, the fraction of open source Rust projects that rely on Syn is still climbing aggressively (see red line). This reflects how important procedural macros are to the experience we want people to have when working with Rust — empowering everyone to build reliable and efficient software.

This 1.0 release signifies that Syn is a polished library with a stable design and role and that it offers a user experience we can stand behind as the way we recommend for all Rustaceans to write procedural macros.

Be aware that the underlying Rust language will continue to evolve. Syn is able to accommodate most kinds of Rust grammar changes via the nonexhaustive enums and Verbatim variants in the syntax tree, but we will plan to put out new major versions on a 12 to 24 month cadence to incorporate ongoing language changes as needed.

Note: in combination with this release, please see also the release notes for quote 1.0 which resolves multiple longstanding limitations of the quote macro.

Breaking changes

... (truncated)

• 6979e8e Release 1.0.5
• e95b976 Update generated code for Variadic
• 56ed074 Expose Variadic without "full" feature
• 1fe42ca Add attrs to variadic in bare fn type
• 04459d2 Update test suite to nightly-2019-08-26
• 89c77ed Release 1.0.4
• e51cb9b Format with rustfmt 2019-08-19
• 29bafc1 Merge pull request #700 from exphp-forks/fix-iterators
• 477ac22 Add missing size_hint implementations
• 59da4f1 Update test suite to nightly-2019-08-19
• Additional commits viewable in compare view

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