[jira] [Assigned] (GROOVY-10317) Type variable substitution does not work properly on parameterized function's return type

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

     [ https://issues.apache.org/jira/browse/GROOVY-10317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Milles reassigned GROOVY-10317:
------------------------------------

    Assignee: Eric Milles

> Type variable substitution does not work properly on parameterized function's return type
> -----------------------------------------------------------------------------------------
>
>                 Key: GROOVY-10317
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10317
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static Type Checker
>            Reporter: Thodoris Sotiropoulos
>            Assignee: Eric Milles
>            Priority: Major
>
> I have the following program
> {code:java}
> class A<T1, T2> {
>   void m1(T1 x) {}
>   void test() {
>     var x = new B();
>     T2 y = null;
>     (new A<T2, T2>()).m1(x.m2(y));
>   }
>   
> }
> class B {
>   <X, Y> X m2(Y x) { return null; }
> }
> {code}
> h3. Actual behaviour
> {code}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
> test.groovy: 8: [Static type checking] - Cannot call A#m1(T2) with arguments [#X]
>  @ line 8, column 5.
>        (new A<T2, T2>()).m1(x.m2(y));
>        ^
> 1 error
> {code}
> h3. Expected behaviour
> Compile successfully.
> **Note**: If I change the expected type of parameter `x` in method `m1(T1 x)` to `m1(T2 x`), the program compiles as expected.
> Tested against master



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