[jira] [Updated] (GROOVY-10367) STC fails to infer the correct type for type variable in the presence of the diamond operator and bounded polymorphism

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

     [ https://issues.apache.org/jira/browse/GROOVY-10367?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Milles updated GROOVY-10367:
---------------------------------
    Fix Version/s:     (was: 5.0.0-alpha-1)

> STC fails to infer the correct type for type variable in the presence of the diamond operator and bounded polymorphism
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: GROOVY-10367
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10367
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static Type Checker
>            Reporter: Thodoris Sotiropoulos
>            Assignee: Eric Milles
>            Priority: Major
>             Fix For: 3.0.11, 4.0.2
>
>
> This issue may be related to GROOVY-10343.
> I have the following program
> {code:java}
> class A<Z, P extends Z> {
>   Z f;
>   A(Z f) {}
> }
> class B<Z extends Number> {
>   Z f;
>   void test() {
>     f = new A<>((Z) null).f;
>   }
> }
> {code}
> h3. Actual behaviour
> {code}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
> test.groovy: 10: [Static type checking] - Cannot assign value of type java.lang.Object to variable of type Z
>  @ line 10, column 9.
>        f = new A<>((Z) null).f;
>            ^
> 1 error
> {code}
> h3. Expected behaviour
> Compile successfully
> NOTE: Replacing `Z extends Number` with `Z` leads to a successful compilation.
> Tested against master (https://github.com/apache/groovy/commit/cf2f77fb033a10d36c4db3a7ff07a2b04631afcf)



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