Undocumented behavior: Multiple input files are concatenated.

[John W. Millaway]

Hold on to your cap for this one! Flex treats multiple files on the command
line as one big flex input file, instead of treating them as separate entities.
In other words:

    $ flex  foo.l bar.l

    # ... is the same as
    $ cat foo.l bar.l | flex

    # ... and NOT the same as
    $ flex foo.l
    $ flex bar.l

-John


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