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https://issues.apache.org/jira/browse/GROOVY-10792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17625762#comment-17625762
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Eric Milles commented on GROOVY-10792:
--------------------------------------
Outside of STC, the safe bet for making something like this work is to use a
method which has return-type assurance.
{code:groovy}
void proc(Supplier<Boolean> s) {
boolean result = s.get().booleanValue()
assert !result
}
Boolean m() {
def list = []
return list
}
proc(this.&m) // or ::
{code}
> Declared generic parameter on method not transferred to Closure
> ---------------------------------------------------------------
>
> Key: GROOVY-10792
> URL: https://issues.apache.org/jira/browse/GROOVY-10792
> Project: Groovy
> Issue Type: Bug
> Components: Compiler
> Affects Versions: 4.0.6
> Reporter: Christopher Smith
> Assignee: Eric Milles
> Priority: Minor
>
> This is probably a duplicate, but I'm not sure which of.
> I'm using Awaitility's {{until(Callable<Boolean>)}} and passing it a closure:
> {code:groovy}
> List<String> buffer = []
> ...
> await().until { buffer }
> {code}
> Expected behavior: {{buffer}} is coerced to a boolean using Groovy truth.
> Actual behavior:
> {code}
> java.lang.ClassCastException: class java.util.ArrayList cannot be cast to
> class java.lang.Boolean
> {code}
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