plugins/groovy/testdata/refactoring/changeSignatureForJava/CovariantReturnType.java

import java.util.List;

class A {
    List <caret>method() { }
}

class Q implements List, Runnable  {
}

class Z implements List {
}

class B extends A {
    Q method() { }
}

class C extends A {
    Z method() { }
}