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https://issues.apache.org/jira/browse/GROOVY-11181?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles resolved GROOVY-11181.
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Fix Version/s: 5.0.0-alpha-11
Resolution: Fixed
https://github.com/apache/groovy/commit/6c31727fb733758af2fc61d4b512be75c9370f39
> Improve STC error message for non-functional interface
> ------------------------------------------------------
>
> Key: GROOVY-11181
> URL: https://issues.apache.org/jira/browse/GROOVY-11181
> Project: Groovy
> Issue Type: Improvement
> Components: Static Type Checker
> Affects Versions: 4.0.15
> Reporter: Christopher Smith
> Assignee: Eric Milles
> Priority: Minor
> Fix For: 5.0.0-alpha-11
>
>
> When the STC decides that a method reference is being provided for a type
> that is not a functional interface, it prints the error
> {code}
> The argument is a method reference, but the parameter type is not a
> functional interface
> {code}
> without specifying what it believes the parameter type _is_. It would be
> helpful for troubleshooting to identify the parameter type.
> https://github.com/groovy/groovy-eclipse/blob/c2999392e161037435c9479bdb2f71f70a3c0f8b/base/org.codehaus.groovy40/src/org/codehaus/groovy/transform/stc/StaticTypeCheckingVisitor.java#L3665
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