[Boost-build] Using a generator directly in the sources?

Subject: [Boost-build] Using a generator directly in the sources?
From: Boris Schaeling (boris_at_[hidden])
Date: 2010-08-26 17:58:10

Quick question: The sources passed to a rule like exe must be existing  
files or defined targets? It's not possible to use a generator directly -  
something like:

exe test : a.cpp libb my.generator ;

If there is no file my.generator bjam complains even if the file extension  
.generator is registered? Just want to make sure I don't give a wrong  
advice to a developer who asked me. :-)

Boris