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https://issues.apache.org/jira/browse/GROOVY-12564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18135465#comment-18135465
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ASF GitHub Bot commented on GROOVY-12564:
-----------------------------------------
daniellansun merged PR #3093:
URL: https://github.com/apache/groovy/pull/3093
> STC: calling a closure of intersection type is typed as "?", giving
> NoClassDefFoundError: ?
> -------------------------------------------------------------------------------------------
>
> Key: GROOVY-12564
> URL: https://issues.apache.org/jira/browse/GROOVY-12564
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Affects Versions: 4.0.33, 5.0.8, 6.0.0
> Reporter: Scott Murphy Heiberg
> Priority: Major
>
> A closure whose return type is an intersection, such as the value of {{flag ?
> 1 : 'x'}}, is typed {{Closure<? extends A & B>}}. A call of such a closure
> through a variable is typed as the wildcard's placeholder class, named "?". A
> closure returning that call gets a {{doCall}} declared to return class "?":
> {code:groovy}
> @groovy.transform.CompileStatic
> Object make(boolean flag) { def outer = { def inner = { flag ? 1 : 'x' };
> inner() }; outer() }
> make(true) // NoClassDefFoundError: ?
> {code}
> The same under {{@TypeChecked}}, in traits, and in static methods and field
> initializers.
> Expected: the call is typed as the wildcard's upper bound (the closure's
> return type).
> PR: https://github.com/apache/groovy/pull/3093
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