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https://issues.apache.org/jira/browse/GROOVY-5746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-5746.
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> Array assignment with operator does double call for index expression and
> array part
> -----------------------------------------------------------------------------------
>
> Key: GROOVY-5746
> URL: https://issues.apache.org/jira/browse/GROOVY-5746
> Project: Groovy
> Issue Type: Bug
> Components: Static compilation
> Affects Versions: 2.0.5, 2.3.0, 2.4.0-rc-1
> Reporter: Jochen Theodorou
> Assignee: Eric Milles
> Priority: Major
> Fix For: 4.0.0-beta-2
>
>
> {code:Java}
> @groovy.transform.CompileStatic
> class IndexTest {
> private int f = 0
> public int getIndex() {f++;0}
> def foo() {
> List<String> x = ["1","2"]
> x[index] += "1"
> assert x[0] == "11"
> assert f == 1
> }
> }
> def x = new IndexTest()
> x.foo()
> {code}
> The program above shows code in which we use an operator in combination with
> array assignment and an index with a side effect. This code must run without
> calling getIndex() twice. Since the field f is incremented twice, this is not
> the case. Normal Groovy executed the code as wished. The probable
> implementation is x[index] = x[index] + "1", which not only evals index
> twice, but also x. x and index must be evaluated only once!
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