Enums - probably an old subject

[Michal Minich]

On Thursday, 21 November 2013 at 07:42:48 UTC, Craig Dillabaugh 
wrote:
> I should also mention, this post likely better belongs in:
>
> digitalmars.D.learn

I don't entirely think so. I think the OP is arguing that D 
should be able to identify symbol as specific enum's field when 
used:
   - in place of function argument when the fn parameters is of 
enum type
   - and when comparing for equality with variable of enum type.

ie. the lookup of the symbol should be first inside the enum, and 
the continue normally.

There was plan long long time ago to implement it, but I don't 
remember for which reason it was not.

In order to consider this again for implementation I think proper 
DIP should be written where complete semantics of this should be 
described. For one I don't know how it should be have if you 
would have variable of the same name as enum field i.e:

enum State { on, off }
auto State s;
auto on = 1;
if (on == on) ?

And I think it would be especially confusing when enum which is 
function parameters has the same field name as local variable on 
call site:

void change (State s) {}
void main () { State on = State.off, change (on) }