Eric Milles created GROOVY-11903:
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             Summary: List minus modifies self in slow path (first element not 
comparable)
                 Key: GROOVY-11903
                 URL: https://issues.apache.org/jira/browse/GROOVY-11903
             Project: Groovy
          Issue Type: Bug
    Affects Versions: 5.0.0
            Reporter: Eric Milles


Consider the following:
{code:groovy}
def one = [null,1,2,3]
def two = [3]
println(one - two)
println(one)
println(two)
{code}

The lists could be filled with any type, as long as the first element is not 
Comparable.  When printing one, the element "3" is no longer present.



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