class Base
{
public void Foo() { }
}

class Generic<T> where T : Base
{
public void Bar(T obj)
{
obj.Foo();
}
}

Select method 'Foo' and apply 'Push members down'. Select 'make abstract'.

class Base
{
public abstract void Foo(); / error CS0513: 'Base.Foo()' is abstract but it is contained in nonabstract class 'Base' /
}

class Generic<T> where T : Base
{
public void Bar(T obj)
{
obj.Foo();
}
}

Expected result:

abstract class Base
{
public abstract void Foo();
}

Issue was closed