I see. I guess JS is the only language with the coloring problem, then, which is strange because it's one of the few with a built-in event loop.

This Io business is isomorphic to async/await in Rust or Python [1]. Go also has a built-in "event loop"-type thing, but decidedly does not have a coloring problem. I can't think of any languages besides JS that do.

[1]: https://news.ycombinator.com/item?id=46126310

> Go also has a built-in "event loop"-type thing, but decidedly does not have a coloring problem.

context is kind of a function color in go, and it's also a function argument.