No it is not a bug, there is no s() in B, you can fix this by adding:

alias s = A.s;

to class B

On Wed, Aug 16, 2017 at 7:21 AM, apz28 via Digitalmars-d-learn <digitalmars-d-learn@puremagic.com> wrote:

abstract class A
{
        string _s;
       
@property:
        final string s()
        {
                return _s;
        }
       
        A s(string x)
        {
                _s = x;
                return this;
        }
}

class B : A
{
@property:
        final override A s(string x)
        {
                _s = x;
                return this;
        }
}
       
void main()
{
        B b = new B();
        b.s = "abc";
        assert(b.s == "abc");
}

Compilation output
/d536/f408.d(32): Error: function f408.B.s (string x) is not callable using argument types ()