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In the manual here:

The following wrapped coroutine is demonstrated:

    for p in perm{"a", "b", "c"} do

    function perm (a)
      local n = table.getn(a)
      return coroutine.wrap(function () permgen(a, n) end)

What I don't understand, is what principle or rule of lua is preventing
perm{"a","b","c"} to get called over and over again.  I mean, evidently
"perm" is only called once, and the coroutine is the only part that keeps on
executing after the initial call to "perm."  I would have thought that
"perm" would get called over and over as well, causing this loop to never
end (or the coroutine.wrap to be executed over and over again).

What magic is at work here?