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https://issues.apache.org/jira/browse/GROOVY-7304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17036497#comment-17036497
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Eric Milles commented on GROOVY-7304:
-------------------------------------
Similar to GROOVY-8707, the prefix expression "++i" performs a standard visit
for the LHS, which results in a ScriptBytecodeAdapter#setProperty (via
{{visitAttributeOrProperty}} ->
{{controller.getCallSiteWriter().fallbackAttributeOrPropertySite(...)}}).
The special handling in StaticTypesBinaryExpressionMultiTypeDispatcher that
converts an expression into a setter call is not easily adaptable to a
situation where the RHS expression has already been visited and is on the
operand stack. If it was, it could be applied within
BinaryExpressionHelper#execMethodAndStoreForSubscriptOperator.
> Cannot mutate private field from within an AIC or a closure
> -----------------------------------------------------------
>
> Key: GROOVY-7304
> URL: https://issues.apache.org/jira/browse/GROOVY-7304
> Project: Groovy
> Issue Type: Bug
> Components: Static compilation
> Reporter: Jochen Theodorou
> Priority: Major
>
> {code:Java}
> class Foo {
> private int i = 1
> @groovy.transform.CompileStatic
> def m() { new String().with {++i}}
> }
> assert new Foo().m() == 2
> class Bar extends Foo {}
> assert new Bar().m() == 2{code}
> The static compiler is unable to generate code which handles the mutation of
> a private field like in the example above.
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