[rules-dev] JBRULES-2932: suspicious syntax might be the cause?

[ljnelson]

In case anyone is following along (silent list!), I finally ran the debugger
on JBRULES-2932 and found a suspicious bit of syntax that was accepted by
Drools 5.1.1 but which causes Drools 5.2.0-SNAPSHOT to barf.

https://issues.jboss.org/browse/JBRULES-2932?focusedCommentId=12591856#comment-12591856

At issue is the following construction:

answer.ID ( > 1 && < 4 ) || == 5

That parenthetical followed by an or-equals looks suspicious to me (dialect
mvel).  Although Drools 5.1.1 eats it just fine, should it?  I want to tell
my users to write the proper rule syntax; this doesn't look right to me.  On
the other hand, if it is proper syntax, I'd rather not change it, as there
are hundreds of rules that use it.  :-(

Best,
Laird

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