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

["Thodoris Sotiropoulos (Jira)" <ji...@apache.org>]

Thodoris Sotiropoulos created GROOVY-10367:
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             Summary: 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


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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