Lox programming language from Crafting Interpreters written in Rust.

You can check out the live playground here.

By default it prints the debug opcodes, traces execution and logs gc. You can build it without those features:

$ cargo build --release --no-default-features

To run a lox program: $ ./target/release/rox <filename>

Or to jump into the REPL: $ ./target/release/rox

You can test it using the test suite.