[antlr-interest] LT(0) Specification

[Carleton Coffrin]

      I am having a problem with the Java version of ANTLR 2.7.5 where
in the middle of parsing a token stream LT(0) returns 'null'.  In all
cases I have found both LT(-1) and LT(1) have non null values,
although they seem to be a few tokens ahead of what I would expect.
Can someone give me some insight into how LT() works so that I may be
able to track down the source of the 'null' value.

-Carleton