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https://issues.apache.org/jira/browse/GROOVY-6176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles resolved GROOVY-6176.
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Resolution: Fixed
Works fine in Groovy 2.5+
> List substraction doesn't work correctly with objects that have the same hash
> code
> ----------------------------------------------------------------------------------
>
> Key: GROOVY-6176
> URL: https://issues.apache.org/jira/browse/GROOVY-6176
> Project: Groovy
> Issue Type: Bug
> Components: groovy-runtime
> Affects Versions: 2.1.1, 2.1.3
> Reporter: Mikhail Chivozertsev
> Priority: Major
>
> During list substraction groovy removes elements with the same hash code. But
> it has to remove equal elements. (It is obviously that sometimes non equal
> elements can have the same hash code)
> {code}
> class MyClass {
> int value = 0
> boolean equals(o) {
> if (o instanceof MyClass && value == o.value) return true
> return false
> }
> int hashCode() {
> return 1
> }
> }
> def o1 = new MyClass(value:1)
> def o2 = new MyClass(value:2)
> def o3 = new MyClass(value:3)
> def list = [o1, o2]
> def result = list - [o3]
> assert result == [] // it looks strange, I think
> {code}
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