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Subprogs as Params: Issues (cont.)

• What is the correct referencing environment for a subprogram that was sent as a parameter?
  • Possibilities:
    • It is that of the subprogram that called it (shallow binding)
    • It is that of the subprogram that declared it (deep binding)
    • It is that of the subprogram that passed it (ad hoc binding, never been used)
  • For static-scoped languages, deep binding is most natural
  • For dynamic-scoped languages, shallow binding is most natural