[jira] [Created] (GROOVY-10291) STC fails to substitute type variable when using the diamond operator and calling a closure

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

Thodoris Sotiropoulos created GROOVY-10291:
----------------------------------------------

             Summary: STC fails to substitute type variable when using the diamond operator and calling a closure
                 Key: GROOVY-10291
                 URL: https://issues.apache.org/jira/browse/GROOVY-10291
             Project: Groovy
          Issue Type: Bug
          Components: Static Type Checker
            Reporter: Thodoris Sotiropoulos


I have the following program

{code:java}
class A<X> {
  X x;
  A(X x) {
    this.x = x
  }
}


class Test<T> {

  void foo() {
    def closure = { T p -> "" }
    T y = null
    bar(new A<>(y).x) // works
    closure(new A<>(y).x) // fails
  }

  void bar(T x) {} 
}
{code}

h3. Actual behavior
{code}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 15: [Static type checking] - Cannot call closure that accepts [T] with [X]
 @ line 15, column 12.
       closure(new A<>(y).x) // fails
              ^

1 error
{code}

h3. Expected behaviour

Compile successfully

Tested against master




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