Printed Lists is shown with thunks, should show values instead

[kmels]

dart-haskell -f examples/interpreter/Lists.hs -e first2

prints:
...
([Thunk(exp=xabL),Thunk(exp=App(App(appt(take_unsafe_UIntr2v,bt1S),App(App(-#,ds2XnB),1)),xsabM))],[])

but should print

 [1,2]