The new compiler is pretty neat!

I am trying to build custom application 'bundles' using 'sencha compile'.

This is working (using include/union with a class)
sencha -d compile -cl=ext/src,app union -r -c app.MyClass and metadata -f -o bundle1.txt
But this is not (using include/union with a file) = the result file is empty
sencha -d compile -cl=ext/src,app union -r -f bundle1.js and metadata -f -o bundle1.txt
bundle1.js only includes this as a test
//@require app.MyClass

Shouldn't this work?