Discussion Thread: DIP 1037--Add Unary Operator ...--Community Review Round 1

Manu turkeyman at gmail.com
Tue Nov 3 06:51:44 UTC 2020

On Tue, Nov 3, 2020 at 4:05 PM Andrei Alexandrescu via Digitalmars-d <
digitalmars-d at puremagic.com> wrote:

> On 11/2/20 9:30 PM, Manu wrote:
> > It's very hard to express a grammar change in a DIP like this, since D
> > doesn't have a grammar as such; it's just an implementation, and
> > reverse-engineering a grammar from the implementation is imprecise.
> > Perhaps my implementation implies additional grammar changes that I
> > didn't notice.
> I thought the grammar is fairly complete, no? It's the semantics that's
> poorly defined.

It may be complete, but it's difficult to relate to the code, and when
making changes to DMD, it's easy to make changes and not clearly see how it
might have affected the grammar shown in the spec.
It's just that someone reverse-engineered an approx grammar from the
implementation. DMD doesn't have a formal grammar; it's implementation
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