Macro expand 

macro_rules! expand {
    ($markup:expr) => { ... };
}

Debug macro to expand farben markup and print intermediate representations.

Prints the input markup, the re-serialized token stream, and the final ANSI output. Useful for debugging markup parsing issues.

Example

expand!("[bold red]hello");
// input:    [bold red]hello
// expanded: [bold][red]hello
// ansi:     "\x1b[1;31mhello"