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raising exceptions

This page is part of the web mail archives of SRFI 12 from before July 7th, 2015. The new archives for SRFI 12 contain all messages, not just those from before July 7th, 2015.

Does the following sentence

  A Scheme implementation ("the system") raises an exception whenever an
  error is to be signaled or whenever the system determines that evaluation
  cannot proceed in a manner consistent with the semantics of Scheme.

mean that a Scheme system must raise an exception whenever the R5RS says
"unspecified" or is it merely allowed to raise an exception in such cases? 

-- Matthias