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https://issues.apache.org/jira/browse/GROOVY-11168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17766784#comment-17766784
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Eric Milles commented on GROOVY-11168:
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{{def <T> T m(@DelegatesTo(type="T") Closure c)}} does propagate the type
parameter to the delegation metadata. The rub here is that the return type
inference comes after the closure/lambda parameter processing, which is where
{{DelegatesTo}} is handled.
https://github.com/apache/groovy/blob/9e5bc22e66c1c462db3e5366b326450cb375cc15/src/main/java/org/codehaus/groovy/transform/stc/StaticTypeCheckingVisitor.java#L2923
If you used a call like "this.<Type>Stub \{ ... \}" you could get the "T"
resolved. But that's probably not what you want.
https://github.com/apache/groovy/blob/9e5bc22e66c1c462db3e5366b326450cb375cc15/src/main/java/org/codehaus/groovy/transform/stc/StaticTypeCheckingVisitor.java#L3317
> Ability to `@DelegatesTo` the return type
> -----------------------------------------
>
> Key: GROOVY-11168
> URL: https://issues.apache.org/jira/browse/GROOVY-11168
> Project: Groovy
> Issue Type: Improvement
> Reporter: Björn Kautler
> Priority: Major
>
> With a method
> {code:java}
> public <T> T Stub(Closure interactions); {code}
> that is then used like
> {code:java}
> Foo foo = Stub { /* configure the foo here */ } {code}
> I'd like to be able to specify that the delegate is of type {{T}} so in the
> given example of type {{{}Foo{}}}.
> Currently we do this in Spock via IDE-specific gdsl/dsld Scripts.
> But it would be nice if this would be supported out of the box.
> (Ideally in 2.5 already, as we still have a 2.5 compatible artifact. :))
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