Debugging mixins - we need to do something

[Peter Alexander]

On Saturday, 8 September 2018 at 22:01:23 UTC, Manu wrote:
> As I and others have suggested before; mixin expansion should 
> emit a `[sourcefile].d.mixin` file to the object directory, 
> this file should accumulate mixin instantiations, and perhaps 
> it would be ideal to also emit surrounding code for context.

This implies also emitting all template instantiation instances, 
right?

I agree this is an important problem.