DIP 1008 Preliminary Review Round 1

[Ola Fosheim Grøstad via Digitalmars-d]

On Saturday, 20 May 2017 at 15:05:44 UTC, Stefan Koch wrote:
> Ah tagging behind the scene is an option, it comes with runtime 
> cost though.

(I guess you meant compile-time cost)

> And tagging would disallow the tricky and very common usecase 
> of overlaying and int and a float.
>
> This I understand, is heavily used.

So this is allowed by the language spec? Anyway, since 
compile-time is harder to debug than run-time that seems to be a 
reasonable restriction.

(C++ has this restriction as a general rule: one are only allowed 
to read from a union field if it was the most recently written 
to.)