[jira] [Resolved] (GROOVY-9995) Wrong inference inside closure when having a bounded type parameter

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

     [ https://issues.apache.org/jira/browse/GROOVY-9995?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Milles resolved GROOVY-9995.
---------------------------------
    Fix Version/s: 4.0.0-alpha-3
       Resolution: Fixed

> Wrong inference inside closure when having a bounded type parameter
> -------------------------------------------------------------------
>
>                 Key: GROOVY-9995
>                 URL: https://issues.apache.org/jira/browse/GROOVY-9995
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static compilation, Static Type Checker
>    Affects Versions: 3.0.7, 4.0.0-alpha-2
>            Reporter: Stefanos Chaliasos
>            Assignee: Eric Milles
>            Priority: Major
>             Fix For: 4.0.0-alpha-3
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> I have the following Groovy program.
> {code:groovy}
> @groovy.transform.CompileStatic
> public class Main {
>   public static void main(String[] args) {
>     Closure<A<Long>> closure =  { -> {
>       final x = (Long) 1;
>       new A<>(x);
>     }}
>     // If I remove 'extends Number' in class A, the following code
>     // works as expected.
>     final Long y = closure().f;
>   }
> }
> class A<T extends Number> {
>   T f;
>   public A(T f) {
>     this.f = f;
>   }
> }
> {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: 10: [Static type checking] - Cannot assign value of type java.lang.Number to variable of type java.lang.Long
>  @ line 10, column 20.
>        final Long y = closure().f;
>                       ^
> 1 error
> {code}
> h2. Expected Behavior
> Compile successfully.
> h2. Affected Version
> I have also tested it with the compiler from Master (commit: e69c874e1a6a3cdeb236bad6a6faa061a30c88ca).



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