Interim fix for interpreted code
Interim fix for interpreted code

This (interim) fix ensure that we can still invoke the plugin during an
interactive session (i.e. ghci).

ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell