[jira] [Resolved] (GROOVY-6800) Compilation error when calling method that has Optional parameter

["Pascal Schumacher (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-6800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pascal Schumacher resolved GROOVY-6800.
---------------------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.11
                   2.4.2

> 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: 2.4.2, 2.3.11
>
>         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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