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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0001-Fix-union-of-IntervalSets-in-case-o
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