Allow identical imports

[Dicebot]

On Tuesday, 30 July 2013 at 11:01:07 UTC, JS wrote:
> On Tuesday, 30 July 2013 at 10:36:15 UTC, Dicebot wrote:
>> You can use scoped local imports and avoid necessity to track 
>> global state.
>
> Huh? If I follow you, this won't work. I'm generating code so 
> don't have the luxury to mess with the outer scope where the 
> code is going.
>
> mixin(code fragment)
>
> user code
>
> mixin(code fragment)
>
> user code
>
> if both code fragments have the same import statement then 
> there is an error. The only way for them to be aware of that is 
> to have a global state(well, relative to the scope they are in).

Don't have imports generated in two different mixins in same 
scope. Either move each mixin into own scope, or move import 
generation code into separate mixin that get called once per 
scope. (example of vibe.d using latter: 
https://github.com/rejectedsoftware/vibe.d/blob/master/source/vibe/http/rest.d#L245)