-- Simple Recovery of types - opaque types
:set -XExistentialQuantification -XDeriveDataTypeable -XGeneralizedNewtypeDeriving
:l ../Test
let t = O (map Just [[1,1],[2,2]])
:p t
-- should have bound _t1 now
:show bindings
seq _t1 ()
:p t
:show bindings
seq _t2 ()
:p t
seq _t4 ()
:p t
:t _t7