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With (read) capable of executing arbitrary code via quote, etc. it is entirely possible for (read) to encounter an error. I want to know whether an error returned from (read) is one that was written and read, or one that prevented correct reading from occurring.
How is this different from expecting to read a list and getting #f instead, and not being sure if the #f appeared as a literal in the input stream or was generated by code called by the reader?
Do you want two different kinds of #f? Those that are generated and those that are read?
Regards, Alan -- Dr Alan Watson Centro de Radioastronomía y Astrofísica Universidad Astronómico Nacional de México