Given the code

public class Test implements ITest {

    public void Foo() {
    }
}

interface ITest {
    void Foo();
}

When rename method (Shift+F6) is used on Test.Foo(), the user selects "Yes" at "Do you want to rename the base method?", and then renames the method from "Foo" to "foo", the resulting code will not compile:

public class Test implements ITest {

    public void Foo() {
    }
}

interface ITest {
    void foo();
}

Issue was resolved