An implementation of Smalltalk 80 in Rust based on the freely available blue book.
The parser is implemented using combine.
I'm coming from Haskell, so the Parsec inspiration was familiar and welcome.
The parser was initially implemented by reading the first chapter on syntax and following along. That proved to be a bit treachorous, with quite a few subtle implementation bugs. Fortunately, the back of the book provided a railway syntax chart, which made it quite easy to write the parser for.