[jira] [Created] (GROOVY-9952) STC does not correctly type check variable whose type is a type variable

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

Thodoris Sotiropoulos created GROOVY-9952:
---------------------------------------------

             Summary: STC does not correctly type check variable whose type is a type variable
                 Key: GROOVY-9952
                 URL: https://issues.apache.org/jira/browse/GROOVY-9952
             Project: Groovy
          Issue Type: Bug
          Components: Static Type Checker
            Reporter: Thodoris Sotiropoulos


I have the following program

 
{code:java}
class Y {}
class X<T> {
    T x;
    public X() {
      this.x = new Y()
    }
    T foo() { return this.x }
}
class Main {
  public static void main(String[] args) {
    bar(new X<Integer>());
  }
  public static Integer bar(X<Integer> y) {
    return y.foo()
  }
}
{code}
h3. Actual Behaviour

The program above complies, and at runtime I get the exception
{code:java}
Exception in thread "main" org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'Y@57175e74' with class 'Y' to class 'java.lang.Integer'
        at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToNumber(DefaultTypeTransformation.java:175)
        at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:282)
        at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:243)
        at org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:318)
        at Main.bar(groovy1.groovy:19)
        at Main.main(groovy1.groovy:15)

{code}
h3. Expected Behaviour

The program should not compile. The problem is at line 5 where you assign something of type Y to a variable of type T.



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