Re: Version 0.17.0 released!

[adrianv]

congrats! How can I activate the VTable types described in the manual 
[https://nim-lang.org/docs/manual.html#generics-vtable-types](https://nim-lang.org/docs/manual.html#generics-vtable-types)
 ? I tried thy example from the manual but the compiler complains about 
undeclared identifier vtref.