On Wednesday, 2 November 2022 at 08:02:13 UTC, UmmReally wrote: >.... argH! prehistoric forum software! > Wanting to use a class to represent a concrete abstract type, > which you can do in 'official D', is not bikesheding. CORRECTION: Wanting to use a class to represent a concrete abstract type, which you CANNOT do in 'official D', is not bikesheding.