[jira] [Closed] (GROOVY-10128) Cannot assign closure with long as return type to java.util.function.Function

["Paul King (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-10128?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paul King closed GROOVY-10128.
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> Cannot assign closure with long as return type to java.util.function.Function<X, Number>
> ----------------------------------------------------------------------------------------
>
>                 Key: GROOVY-10128
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10128
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static compilation, Static Type Checker
>    Affects Versions: 3.0.8, 4.0.0-alpha-3
>            Reporter: Stefanos Chaliasos
>            Assignee: Eric Milles
>            Priority: Major
>             Fix For: 4.0.0-beta-2
>
>
> I have the following Groovy program.
> {code:groovy}
> import java.util.function.Function;
> @groovy.transform.TypeChecked
> class Main {
>   public static void main(String[] args) {
>       Function<String, Number> x = { y ->
>           final long d = 1;
>           return d;
>       };
>   }
> }
> {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: 6: [Static type checking] - Incompatible generic argument types. Cannot assign java.util.function.Function <java.lang.String, java.lang.Long> to: java.util.function.Function <String, Number>
>  @ line 6, column 36.
>          Function<String, Number> x = { y ->
>                                       ^
> 1 error
> {code}
> h2. Expected Behavior
> Compile successfully.
> h2. Comment
> Note that javac accepts this program.
> h2. Affected Version
> This programs have been tested with the compiler from the master (commit: 05a39632565bee88949c8db9d56b9f9598321fc2), 4.0.0-alpha-3, and 3.0.8.



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