The "copy" transformation given in the paper "Practical Declarative Model Transformation with Tefkat" no longer works properly, due to a bug in matching the "_" type which matches non-existent generics. The changes to EMF for Generics also seem to have affected Tefkat's ability to copy references to EString (and presumably the other built in types as well).
A work-around exists to stop the matching of Generics, but this does not fix the built in type problem.
A simple test model tpo try out the "copy" transformation
The result of applying "copy" to Test.ecore
The "copy" transformation