[GROOVY-6030] "Reference to method is ambiguous" reported for unambiguous usage of List implementors

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.1.1
• Fix Version/s: 2.1.2
• Component/s: Static Type Checker
• Assignee: Cédric Champeau
• Reporter: OC
• Created: 27/Feb/13 14:12
• Updated: 19/Mar/13 05:11
• Resolved: 06/Mar/13 03:22

Description

For List implementors which extend Object, some methods (e.g., find) are considered ambiguous, although the List implementation should win.

Test case:

86 /tmp> >q.groovy
class Mylist implements List {}
@groovy.transform.TypeChecked class t {
   def whatthe(Mylist a) {
       a.find { true }
   }
}
87 /tmp> groovyc q.groovy

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
q.groovy: 4: [Static type checking] - Reference to method is ambiguous. Cannot choose between [java.lang.Object <T> java.util.Collection <T>#find(groovy.lang.Closure), java.lang.Object java.lang.Object#find(groovy.lang.Closure)]