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On 17-Oct-05, at 10:20 PM, Glenn Maynard wrote:

The case I was thinking of is

  function f(it) for x,y in it do print(x) end end
  t = { 1, 2, 3 }
  f( pairs(t) )

  function f(...) for x,y in ... do print(x) end end
  t = { 1, 2, 3 }
  f( pairs(t) )

keep finding Lua's multiple-results unintuitive and rather forced compared
to the rest of the language; I guess I'll get used to them eventually.

There's no problem with multiple-results here; you simply haven't provide for multiple arguments.

Clearly, run-time warnings are a non-starter. At run-time, you either get an error or a strange result or it works. (In the case of the C problem, writing = for ==, you tend to get strange results.)

The algorithm I outlined for compile-time warnings would have correctly flagged that case, although it wouldn't have provided the correct solution.