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I love Lua. Wish there was a shorter syntax for anonymous functions, though. (function(x) return x*x end)

Also, Lisp macros would be nice (didn't look at metalua)

Metalua comes out-of-the-box with a short lambda syntax: "function (x, y, ...) return foobar end" is shortened as "|x,y,...| foobar".

And it comes with macro capabilities, plus syntax extension facilities to make them more user friendly.