In working with Lua custom dissectors, if I pass the current dissector's
'buffer' variable to another dissector that I am calling for a specific
subrange of the data, the 'buffer' variable is destroyed when the second
dissector finishes and is no longer available to the first dissector.

To work around this I wanted to create a new Tvb (using a range from the
original Tvb buffer) to pass to the second dissector.  The Tvb calls
'new_real' and 'tvb' don't seem to be recognized though.  Are these
calls supposed to be available or is there some other reason they can't
be called using Lua?

Thanks,
Matt
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