Complete D grammar

[Rainer Schuetze]

Trass3r wrote:
> Rainer Schuetze Wrote:
>> I've set up a comparison with some notes here:
>>
>> http://www.dsource.org/projects/visuald/wiki/GrammarComparison
> 
> Very nice comparison style.
> What would be an appropriate way to discuss grammar changes?
> I think many things should be simplified/clarified.

I'd welcome this. I see a few options, but none is currently perfect:

- in a wiki. both dsource and wiki4d don't seem to have discussion 
pages, though. I'm not sure the comparison tables can be converted to 
something maintainable - it's currently very verbose html.
- here on the newsgroup. this would probably have the widest audience, 
but also might easily get lost. maybe with keeping track of 
ideas/results in wiki4d.
- in bugzilla. this might get spread into multiple entries causing loss 
of the overview of the overall grammar.

> 
> For example, isn't AutoDeclaration already covered by Decl -> StorageClasses Decl and so on?
> Also there are 3 different instances of mixin: MixinExpression, MixinStatement and MixinDeclaration. Even though they all come down to the same thing.
> Modifiers like shared are repeated, e.g. in BasicType, Attribute, TypeSpecialization. Also your proposed TypeWithModifier somewhat replicates parts of BasicType (just without the parentheses) 

I think, the different mixin variants are ok, because you might want to 
generate different AST for these. But the confusion of 
const/shared/immutable etc in Attribute,StorageClass,Types,etc causes a 
lot of headaches.