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https://issues.apache.org/jira/browse/GROOVY-11450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-11450.
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> flow typing can lead to type unsafe results when having nested ifs
> ------------------------------------------------------------------
>
> Key: GROOVY-11450
> URL: https://issues.apache.org/jira/browse/GROOVY-11450
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Reporter: Thodoris Sotiropoulos
> Assignee: Eric Milles
> Priority: Minor
> Fix For: 3.0.23, 4.0.23, 5.0.0-alpha-10
>
>
> I have the following program
> {code:java}
> class A {
> Object clone() { return null; }
> }
> class Main {
> public static void main(Object y) {
> def x
> x = new A()
> if (false ){
> x = new A()
> } else {
> if (true) {
> x = 1
> }
> }
> x.clone();
> }
> } {code}
> h3. Actual behavior
> The program compiles, but I receive the following error at runtime:
> {code:java}
> Exception in thread "main" java.lang.ClassCastException: class
> java.lang.Integer cannot be cast to class A (java.lang.Integer is in module
> java.base of loader 'bootstrap'; A is in unnamed module of loader 'app')
> at Main.main(test.groovy:16) {code}
> h3. Expected behavior
> The code should have been rejected with
> {code:java}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup
> failed:
> test.groovy: 12: Cannot access method: clone() of class: java.lang.Object @
> line 12, column 5.
> x.clone();
> ^1 error
> {code}
>
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