adding support for column numbers

Jeffrey A Law
Sun Jan 31 23:58:00 GMT 1999

  In message < >you write:
  > model might be more efficient.  Besides error messages and debug info, what
  > needs line numbers?
__LINE__ expansion.

In the end, the biggest user of line info is for generation of line debug
symbols (which can be significant).

Callbacks are generally frowned upon, but not outright rejected.  Depends on
the situation.


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