[threepio]

From the article:

> The magic is that all Scheme code, by virtue of supporting the capture (and unwind) of delimited continuation

Is that true? I thought Racket was the only Scheme (and maybe the only language in general) that supported delimited continuations.

[pkhuong]

You can implement delimited continuations with regular call/cc and a mutable cell. Of course, like all abstractions based on raw call/cc, it's not modular: you can't do that and use the result inside, for example, a multitasking scheduler that itself uses raw call/cc as well.

http://okmij.org/ftp/continuations/against-callcc.html#traps

Closer to your point, there are a few other implementations that offer delimited continuations natively. See https://wingolog.org/archives/2010/02/26/guile-and-delimited... for a 11 year old post on adding them to guile scheme.

[rscho]

Nope, there are others. Prolog, for example:

https://www.swi-prolog.org/pldoc/man?section=delcont