[antlr-interest] testing subrules and noviable alt upon eof

[Brent Yates]

Felix,

I believe that this is a problem with the DFA's produced for rules which end
in conditional alternates.  The DFA's fire the exception if a token is seen
that is not in the expected set for the grammar as a whole.  This makes
calling the rules in isolation a problem.  Dr. Parr is aware of the issue.
The only work around I know of right now is to add "Test" rules for the
problem cases which end in EOF.

Brent
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