How to import for mixin contents only.

[Taylor Hillegeist via Digitalmars-d-learn]

On Thursday, 10 March 2016 at 16:51:32 UTC, Andrea Fontana wrote:
> On Thursday, 10 March 2016 at 16:20:42 UTC, Taylor Hillegeist 
> wrote:
>> I feel like this should do what i want it too. but it doesn't.
>>
>> struct Color_t {
>> 	static if(1==1){
>> 		import std.bitmanip:bitfields;
>> 		immutable string item = bitfields!(		
>> 				uint, "R",    8,
>> 				uint, "G",   8,
>> 				uint, "B",    8,
>> 				uint, "A", 8);
>> 	}
>> 	mixin(item);
>> }
>
> I wonder if compiler is smart enaugh to undestand that 
> dependency is not needed at runtime in this case:
>
> http://dpaste.dzfl.pl/fd3bc2a839a3

well the latest gdc isnt smart enough.

immutable(string) BF(){
	if(!__ctfe)
		assert(0);
	import std.bitmanip:bitfields;
	return bitfields!(		
			uint, "R", 8,
			uint, "G", 8,
			uint, "B", 8,
			uint, "A", 8);
}

struct Color_t {
	mixin(BF());
}

is a fair try as well. but neither work.