[jira] [Created] (GROOVY-10153) STC: cannot combine use-variance with bounded polymorphism

["Stefanos Chaliasos (Jira)" <ji...@apache.org>]

Stefanos Chaliasos created GROOVY-10153:
-------------------------------------------

             Summary: STC: cannot combine use-variance with bounded polymorphism
                 Key: GROOVY-10153
                 URL: https://issues.apache.org/jira/browse/GROOVY-10153
             Project: Groovy
          Issue Type: Bug
          Components: Static compilation, Static Type Checker
    Affects Versions: 4.0.0-alpha-3
            Reporter: Stefanos Chaliasos


I have the following Groovy program.
{code:groovy}
@groovy.transform.TypeChecked
class Test {
  public void m() {
    Foo<? super C> x = new Foo<B>();
  }

}

class A {}
class B extends A {}
class C extends B {}

class Foo<T extends A> {
}
{code}
h2. Actual Behavior

The program does not compile, and I get the following error.
{code:java}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
Test.groovy: 4: The type ? is not a valid substitute for the bounded parameter <T extends A>
 @ line 4, column 9.
       Foo<? super C> x = new Foo<B>();
           ^

1 error
{code}
h2. Expected Behavior

Compile successfully.



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