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https://issues.apache.org/jira/browse/GROOVY-6800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pascal Schumacher closed GROOVY-6800.
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> Compilation error when calling method that has Optional<Closure> parameter
> --------------------------------------------------------------------------
>
> Key: GROOVY-6800
> URL: https://issues.apache.org/jira/browse/GROOVY-6800
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Affects Versions: 2.3.0, 2.4.0-rc-1
> Reporter: Rob Fletcher
> Assignee: Cédric Champeau
> Fix For: 2.3.11, 2.4.2
>
> Attachments: FailingWithClosure.groovy,
> WorkingWithClosureAndCast.groovy, WorkingWithString.groovy
>
>
> I'm seeing a strange issue where if I try to call a method with an
> {{Optional<Closure>}} parameter from a type-checked context using
> {{Optional.of(someClosure)}} I get a compilation error. Other type parameters
> work fine in the same context and weirdly so does {{Optional.absent()}}.
> I've attached 3 scripts that demonstrate the problem.
> * _FailingWithClosure.groovy_ shows the problem occurring. I have a method
> that accepts {{Optional<Closure>}} and two statically compiled methods that
> call it, one with {{Optional.of(someClosure)}} and one with
> {{Optional.absent()}}.
> * _WorkingWithString.groovy_ is the same code but with {{String}} type
> parameters instead of {{Closure}}. It works fine.
> * _WorkingWithClosureAndCast.groovy_ shows that if I explicitly cast the
> argument to {{Optional<Closure>}} it works.
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