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|Foreign stream error handling|
TRUEif the stream is in an error condition,
FALSEif the stream is valid and in normal condition and -1 if the stream is invalid.
SIO_FERR. This causes PL_release_stream() to print a message (
SIO_WARN) or raise an exception (
SIO_FERRcondition on the stream. If an exception is assocated PL_release_stream() raises this exception.