[antlr-interest] Removing global backtracking

[Andreas Bartho]

Hello,

inspired by the recent discussion about global backtracking I tried to 
remove global backtracking from my grammar. My plan was to enable 
backtracking for each rule individually, then turn global backtracking 
off and try to disable individual backtracking for one rule at a time to 
identify the rules that cause problems.
However, this does not work. ANTLR reports for a number of rules that 
multiple alternatives can match a given input (even for rules that have 
only one alternative).
Isn't global backtracking and local backtracking for each rule supposed 
to be equivalent? If not, how do they differ?
I tried version 3.01 and the latest intermediate built.

Andreas