On 12/12/25 16:39, Charles Mills wrote:
FWIW, Google AI sez

In IBM VSE, trying to read a sequential file (like a card reader input stream) past the 
end-of-file (EOF) marker will result in an error or an exception. You cannot "read 
past EOF" in the conventional sense of retrieving more data, because no more data 
exists. The standard approach is to detect the EOF condition and stop reading.
    ...
This appears to be discussing in-band delimiters,
not out-of-band, such as the operator's pressing
a button on the reader or a reflective spot on
tape.

In-band delimiters impel a duty to provide an escape
convention so the delimiter, however unlikely,
can appear as ordinary data.

Allowing alternate delimiters is unsatisfactory
because it requires the user to search by trial-and-error
for a string absent from the data.

--
gil

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