[antlr-interest] Bug: incorrect IntervalSet created by union

[Jiří Paleček]

Hello,

I'm creating a grammar for POSIX shell language. I noticed, that  
sometimes, I get invalid java files, particularly, files which contain  
duplicated case labels in switch statements. I debugged the problem and  
found out it was caused by a bug in code for union of two IntervalSets.  
The attached patch contains a fix for this, and a testcase to demonstrate  
it.

Regards
     Jiri Palecek

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