[jira] [Commented] (GROOVY-8411) Support instanceof-like flow typing for class literal switch case

["Paul King (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GROOVY-8411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16287159#comment-16287159 ] 

Paul King commented on GROOVY-8411:
-----------------------------------

This should be possible. It would need to take into account fall-through scenarios.

> Support instanceof-like flow typing for class literal switch case
> -----------------------------------------------------------------
>
>                 Key: GROOVY-8411
>                 URL: https://issues.apache.org/jira/browse/GROOVY-8411
>             Project: Groovy
>          Issue Type: Improvement
>            Reporter: Eric Milles
>            Priority: Minor
>
> Would it be possible to extend the {{maybeFile instanceof File ? maybeFile.canonicalPath : maybeFile.toString()}} flow typing where {{maybeFile}} is seen as {{File}} in the true expression position to work for {{switch}}?
> This is the kind of construct I am thinking of:
> {code}
>   switch (maybeFile) {
>   case File:
>     maybeFile.canonicalPath
>     break
>   default:
>     maybeFile.toString()
>   }
> {code}
> Currently is the example falls in an {{@TypeChecked}} or {{@CompileStatic}} scope, there is an error for the {{canonicalPath}} reference.



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