% Install the transformation pretty-printer, as defined in pret-trans.lua.
\installprettytype [TRANS] [TRANS]
% Define \starttrans \stoptrans
-\definetyping[trans][option=TRANS,style=normal,before=,after=]
+\definetyping[trans][option=TRANS,style=normal,before=]
% Install the haskell pretty-printer, as defined in pret-haskell.lua.
\installprettytype [HASKELL] [HASKELL]