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

["Stefanos Chaliasos (Jira)" <ji...@apache.org>]

Stefanos Chaliasos created GROOVY-9931:
------------------------------------------

             Summary: !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


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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