Code highlighting

a, b.

let a = "backquote";

Then,

// Shiki code block
let a = "backquote";

pub trait LoxCallable: Display + Debug {
  fn call(self: Rc<Self>, interpreter: &mut Interpreter, args: &[LoxValue]) -> CFResult<LoxValue>;
  fn arity(&self) -> usize;
}

where CFResult is:

pub type CFResult<T> = Result<T, ControlFlow<LoxValue, RuntimeError>>;

and ControlFlow is an enum.