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https://issues.apache.org/jira/browse/GROOVY-10439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17470076#comment-17470076
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Eric Milles commented on GROOVY-10439:
--------------------------------------

I decided it best to skip adding the conflicting interface in this case, which 
is current behavior.  However, this more subtle case will generate an error 
thanks to GROOVY-5106:
{code:groovy}
class C extends ArrayList<String> {
  @Delegate Set<Number> numbers
}
{code}

> No error/warning for @Delegate introducing conflicting interface generics
> -------------------------------------------------------------------------
>
>                 Key: GROOVY-10439
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10439
>             Project: Groovy
>          Issue Type: Bug
>          Components: Compiler
>            Reporter: Eric Milles
>            Assignee: Eric Milles
>            Priority: Minor
>
> Consider the following:
> {code:groovy}
> class C implements List<String> {
>   @Delegate List<Number> numbers
> }
> {code}
> C implements List<String> and List<Number> but there is no compiler error or 
> warning.



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