Setting positions for annotation generated trees

I use annotations on objects to generate a lot of code from very little 
code, so I'd like to have a way to match compiler errors from the generated 
code to a location in that code.
It's easy to print the expanded tree to a file using `showCode`, but the 
compiler doesn't know about that, of course.
Alas, I recurse into the generated tree at the very end of the expansion 
and update the position to use the written source file, but it's quite hard 
to determine the correct offset for the individual trees.
Right now, I'm doing it heuristically, treating Template and DefDef 
differently, which is fine, but if there is something off, the compiler 
doesn't use the debug printed file for determination of error context and 
line number, but the file where the macros annotation is, although the file 
name specified is correct.
It worked a few times, though with incorrect offsets.

My question is, is there an easier way to do this? Like, can I use the 
compiler api inside of a macro expansion to do this?

Also, is there a sensible way to set the position attributes? Right now, I 
use runtime reflection on the `Position.withSource` and `Tree.setPos` 
methods and the `SourceFile.file` field.

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