Io also gets coroutines right and makes them very easy to use: * http://www.iolanguage.com/scm/io/docs/IoGuide.html#Concurrency-Coroutines http://www.iolanguag

Io also gets coroutines right and makes them very easy to use: * http://www.iolanguage.com/scm/io/docs/IoGuide.html#Concurrency-Coroutines http://www.iolanguage.com/scm/io/docs/IoGuide.html#Concurren... * http://www.iolanguage.com/scm/io/docs/reference/Core/Core/Coroutine/index.html http://www.iolanguage.com/scm/io/docs/reference/Core/Core/Co... Probably no surprise though because Lua was one of the influences behind Io design/implementation (full list of influencers from http://www.iolanguage.com/ http://www.iolanguage.com/): * Smalltalk (all values are objects, all messages are dynamic), * Self (prototype-based), * NewtonScript (differential inheritance), * Act1 (actors and futures for concurrency), * LISP (code is a runtime inspectable/modifiable tree) * and Lua (small, embeddable).