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https://issues.apache.org/jira/browse/GROOVY-10742?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles resolved GROOVY-10742.
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Resolution: Fixed
https://github.com/apache/groovy/commit/75520486ccd7f12b4f4c1e93cba6e738eedd0aa7
A method reference produces a {{MethodClosure}} under plain STC, which supports
reference to {{void}} method adapted to value-bearing SAM (no runtime error;
returns {{null}}). For that reason, I put the error check in the SC path.
> STC permits incorrect void method reference
> -------------------------------------------
>
> Key: GROOVY-10742
> URL: https://issues.apache.org/jira/browse/GROOVY-10742
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Affects Versions: 4.0.4
> Reporter: Christopher Smith
> Assignee: Eric Milles
> Priority: Minor
>
> In a functional pipeline, I mistakenly used {{map(service::voidMethod)}}
> (where the map operation expects {{Function}}). This should have produced a
> compile-time error but instead produced a runtime error out of the
> LambdaMetafactory.
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