[antlr-interest] Decision can match input such as "'*'" using multiple alternatives: 1, 2
Sergei Politov
spolitov at gmail.com
Wed Nov 30 08:46:31 PST 2011
Hello,
I'm new to ANTLR. I tried to port my grammar from Boost.Spirit to ANTLR
and faced the following warning:
Decision can match input such as "'*'" using multiple alternatives: 1, 2
I made a minimal grammar to reproduce it (also in attach):
======================
grammar X ;
s : e EOF ;
e : t ;
t : f ('*' f)* ;
f : NUM | '-' e ;
NUM : '0'..'9'+ ;
======================
Really I don't understand the described issue.
I don't know input that could match in multiple ways.
Please clarify the situation.
Best Regards,
Sergey
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