In retrospect, this is probably obvious, but maybe someone else is puzzling
over this situation.
I have a SQL grammar with a rule
dotted_name :
ID ( DOT^ ID)*
;
which works correctly, but ANTLR produced the error message
warning(200): plsql.g:1014:8: Decision can match input such as "DOT ID" using
multiple alternatives: 1,2
As a result, alternative(s) 2 were disabled for that input
I tried following the advice of using a syntactic predicate, changing the rule
to
ID (DOT)=>(DOT^ ID)*
but that didn't stifle the warning. I finally realized that I wanted
zero-or-more predicted DOT ID's, and rewrote it as
ID ( (DOT)=>(DOT ^ ID ))*
and the warning went away.
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