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https://issues.apache.org/jira/browse/GROOVY-11792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18034715#comment-18034715
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Paul King commented on GROOVY-11792:
------------------------------------
It has been a long time since this was last discussed, but from memory (though
a little fuzzy since it's been so long) there are references in comp sci
literature for both cases. I am still travelling with limited internet but I'll
have a look when I return shortly. It would also be useful to check behavior in
other languages more fully.
> Incorrect captured variable in closure
> --------------------------------------
>
> Key: GROOVY-11792
> URL: https://issues.apache.org/jira/browse/GROOVY-11792
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.5.23, 3.0.25, 4.0.29, 5.0.2
> Reporter: Daniel Sun
> Priority: Major
>
> Expect 14(1+4+9), but get 27(9+9+9)
> {code:java}
> import java.util.function.Supplier
> def numbers = [1, 2, 3]
> List suppliers = []
> for (n in numbers) {
> println "v: ${n}"
> Supplier s = {
> def r = n * n
> println "$n: $r"
> return r
> }
> suppliers << s
> }
> println "Result: ${suppliers.sum({e -> e.get()})}"
> {code}
> yields:
> {code:java}
> v: 1
> v: 2
> v: 3
> 3: 9
> 3: 9
> 3: 9
> Result: 27
> {code}
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