[le-mark]

I guess you're referring to this[1]. I'd actually call that usage svelte. The macro is undefined not far after it's use in the file, and makes the section it's in far more readable.

[1] https://github.com/lemon-lang/lemon/blob/9a0b3dbc854532b31f7...

[billytetrud]

Why does it have the do-while(0)?

[le-mark]

It's a safeguard because {} statement blocks are optional [1].

[1] https://stackoverflow.com/a/923833/2561675