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Re:Writing a Lisp: Continuations by penpapersw on Thursday May 18, 2017 @06:16PM (#14371553)
Ruby has `#callcc` which produces first-class continuations AFAIK https://ruby-doc.org/core-2.2.0/Continuation.html
Re:Writing a Lisp: Continuations by paulddraper on Thursday May 18, 2017 @11:50PM (#14372894)
Yep. Relatedly, Ruby also has fibers.