public void FooCouldBeBase(Derived foo)
{
foo.Foo();
}
public void BarAndFooCouldBeGeneralized(Derived foo, DerivedDerived bar)
{
bar.Bar(42, "hash");
foo.Foo();
}
public void BarAsGeneralizedArgument(string hash, Derived dbar)
{
dbar.Foo(); //if bar wasn't used as a Derived argument below it would be eligible
DerivedBarCouldNotBeGeneralized(dbar);
}