Hidden and visible variables

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Normally, the variables in the main program are not visible inside a subprogram. But you can make all upcomming variables visible to all subprograms by using the visible statement:

visible:
  i_am_visible
  i_am_also_visible# = 4.0
  i_am_very_visible$[] = ["hello", "there"]
hidden:
...

The variables following hidden (default) are hidden to subprograms.

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