Undefined symbol for, apparently, valid code?

[H. S. Teoh via Digitalmars-d-learn]

On Thu, Jul 06, 2017 at 06:28:11AM +0000, unleashy via Digitalmars-d-learn wrote:
> Hello. I am trying to compile this:
> 
> ---
> module asd.asd;
> 
> abstract class Asd
> {
>     void opCall(Args...)(Args args);
> }
> 
> @system unittest
> {
>     class Foo : Asd
>     {
>         override void opCall(Args...)(Args args)
>         {
>             /* nothing */
>         }
>     }
> 
>     Asd a = new Foo();
> 
>     a(1, 2, 3);
> }
> ---
[...]

Template functions cannot be virtual, and it's invalid to override a
non-virtual function.

Which version of the compiler are you using?  I just tested on the
latest dmd git HEAD, and it (correctly) tells me that it's illegal to
override a non-virtual function.  I'm surprised you got your code to
compile at all.


T

-- 
My program has no bugs! Only unintentional features...