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https://issues.apache.org/jira/browse/GROOVY-7763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15159155#comment-15159155
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John Wagenleitner commented on GROOVY-7763:
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I agree, this is related to GROOVY-7598 which added the same type checking for
return statements. In prior versions if you had a method signature that took
{{List<PromiseDecorator>}} I am pretty sure it would fail to compile if called
with {{[new WebRequestPromiseDecorator(webRequest)]}}.
> Various problems with type inference in Groovy 2.4.6
> ----------------------------------------------------
>
> Key: GROOVY-7763
> URL: https://issues.apache.org/jira/browse/GROOVY-7763
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.4.6
> Reporter: Graeme Rocher
> Priority: Critical
>
> After trying to upgrade Grails to Groovy 2.4.6 there are numerous problems
> with @CompileStatic and type inference with Maps and Lists. If I had seen the
> vote for the release in time I would have tested and voted -1, so sorry for
> only reporting this afterwards.
> This commits shows the changes I had to make in order to get Grails to
> compile with Groovy 2.4.6:
> https://github.com/grails/grails-core/commit/a6d70aaf7925fb7f2e847a803a8e1f3c95bf8cf8
> You can see for example that previously returning a list initialised with
> variables of the correct type compiled, but no longer does:
> https://github.com/grails/grails-core/commit/a6d70aaf7925fb7f2e847a803a8e1f3c95bf8cf8#diff-3092a650525dc131a0394eca4282362bL35
> Also empty lists and maps no longer seem to compile. See:
> https://github.com/grails/grails-core/commit/a6d70aaf7925fb7f2e847a803a8e1f3c95bf8cf8#diff-07f8418b033d870eee3c1cee97e44f4cL121
> https://github.com/grails/grails-core/commit/a6d70aaf7925fb7f2e847a803a8e1f3c95bf8cf8#diff-15a1d1d639cada3a0c85c7200547db02L40
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