+
+% Install the haskell pretty-printer, as defined in pret-haskell.lua.
+\installprettytype [HASKELL] [HASKELL]
+% Define \starthaskell \stophaskell
+\definetyping[haskell][option=HASKELL,before=,after=]
+% Define \hs
+\definetype[hs][option=HASKELL,style=mono]