[GROOVY-9570] Class-Level Closure Definition With Generics Fails TypeChecked

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.5.5, 3.0.0, 3.0.3
• Fix Version/s: 4.0.0-alpha-1, 3.0.6, 2.5.16
• Assignee: Eric Milles
• Reporter: Ian
• Created: 22/May/20 11:54
• Updated: 31/Jan/22 18:58
• Resolved: 15/Sep/20 03:47

Description

 

 

import groovy.transform.TypeChecked

@TypeChecked
abstract class A<T extends List>{
    Collection<T> testQueue
    Closure c = {
        testQueue.each{T item->
            println item
        }
    }
    //def foo() {
    //    testQueue.each{T item->
    //        println item
    //    }
    //}
}
new A<LinkedList>(){}

Put this in filename.groovy and call "groovy filename.groovy" and I get

 

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
/home/ianl/closureGeneric.groovy: 9: Expected parameter of type java.lang.Object but got T
 @ line 7, column 24.
           testQueue.each{T item->
                          ^
1 error

Yet, uncomment the method foo() and there's no error there. or put the closure definition into the method and there's no error.