Hi -

I'm trying to pass a tuple by pointer to an extern function.
The current guidance for arrays is to declare the extern function
to take in a ref argument and then to pass in by-ref A[1]. Doing
the same thing for tuples sometimes passes stack trash.

(I think something about the tuple copy optimization is causing
  this problem but I am not sure. The generated code ends up creating
  a copy of just the first tuple element and then passing a pointer
  to that, instead of declaring the full tuple on the stack).

See test case/bug report in test/users/ferguson/tuple_to_extern.chpl

Thanks,

-michael

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