Lox in Rust

Context

This project is done following the guide at https://craftinginterpreters.com/ but written in rust

main.rs - entrypoint - here we decide if usage is correct and if we are running a file or doing REPL - the source file is transferred to a Lox class instance
lox.rs - the global Lox class that should be a singleton since it's one instance per run - here is where we give a green light to the runner. We also implement the ScannerError trait here so that we can report errors
scanner.rs - the scanner of the language - here
token.rs - the implementation of the Token and TokenType, also the implementation of the Display trait for them both
literal.rs - implementation of the Literal enum and the Display trait for it
error.rs - definition of the ScannerError trait to be implemented by the Lox struct
expr.rs - defines the Expr enum and exports all the expressions (which are in turn generated using nerodesu017/interpreter-code-gen)
visitor.rs - this contains the basic Visitor template needed for creating all sorts of Visitors based on the Visitor Pattern - sadly, I could not fully decide on if I should use the Java-like Visitor Pattern, which uses Polymorphic Dispatching, or use the FP way and make use of match, thus, even though the current logic uses match, the Visitor trait is there, besides not being used - part of it generated using nerodesu017/interpreter-code-gen