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