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https://issues.apache.org/jira/browse/GROOVY-10529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Eric Milles closed GROOVY-10529.
--------------------------------
Resolution: Duplicate
> Cannot use closures as arguments for varargs method
> ---------------------------------------------------
>
> Key: GROOVY-10529
> URL: https://issues.apache.org/jira/browse/GROOVY-10529
> Project: Groovy
> Issue Type: Bug
> Components: Compiler
> Affects Versions: 3.0.10
> Environment: Edition Windows 10 Enterprise
> Version 20H2
> Installed on 10/12/2020
> OS build 19042.685
> Experience Windows Feature Experience Pack 120.2212.551.0
> Reporter: Kevin Sheppard
> Priority: Minor
> Labels: varargs
>
> When I run the following code:
> {code:groovy}
> interface Handler {
> void handle(String)
> }
> def foo(Handler... handlers) {
> handlers.each { it.handle('Hello!') }
> }
> foo({ print(it) }, { print(it.toUpperCase()) }) {code}
> I get this error message:
> {noformat}
> No signature of method: ConsoleScript8.foo() is applicable for argument
> types: (ConsoleScript8$_run_closure1, ConsoleScript8$_run_closure2) values:
> [ConsoleScript8$_run_closure1@4359df7, ConsoleScript8$_run_closure2@4288c46b]
> {noformat}
> Apparently, Groovy isn't seeing the closures as instances of Handler. This
> doesn't happen in Java or Kotlin.
> The workaround is to cast each closure as a Handler instance, but it makes
> for very awkward usage of the method.
> {code:java}
> foo({ print(it) } as Handler, { print(it.toUpperCase()) } as Handler) {code}
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