[jira] [Closed] (GROOVY-9931) !instanceof inference does not work

["Eric Milles (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-9931?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Milles closed GROOVY-9931.
-------------------------------
    Resolution: Duplicate

> !instanceof inference does not work
> -----------------------------------
>
>                 Key: GROOVY-9931
>                 URL: https://issues.apache.org/jira/browse/GROOVY-9931
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static Type Checker
>    Affects Versions: 3.0.7
>            Reporter: Stefanos Chaliasos
>            Assignee: Eric Milles
>            Priority: Major
>
> I have the following Groovy program
>  
> {code:groovy}
> @groovy.transform.CompileStatic
> class Main {
>     static Integer bar(Object o) {
>         if (o !instanceof Integer) {
>             return 0
>         } else {
>             return o
>         }
>     }
> }
> {code}
> h2. Actual Behavior
> The program does not compile, and I get the following error.
> {code:java}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
> Main.groovy: 7: [Static type checking] - Cannot return value of type java.lang.Object on method returning type java.lang.Integer
>  @ line 7, column 9.
>            o
>            ^
> 1 error
> {code}
> h2. Expected Behavior
> Compile successfully.



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