Enhancement: issue error on all public functions that are missing ddoc sections

[Walter Bright via Digitalmars-d]

On 3/19/2015 3:02 AM, Don wrote:
> appear to be public only as an workaround (necessary for mixins or something).
> Perhaps such things shouldn't actually be documented. But we don't have a
> mechanism for that.

We already have a special:

     /// ditto

comment. Perhaps:

     /// undocumented

? At least then it would be a deliberate choice.