[Haskell-cafe] Heist template splice functions and custom monad

I'd like to run Heist template splice functions in my own custom monad. I can define a splice function as: mySplice :: Splice MyMonad However, when I try to call functions that return values in my monad in mySplice, I get a compile error: Couldn't match expected type TemplateMonad MyMonad a against inferred type MyMonad () I've seen an example in the Heist documentation where the inner MyMonad is accessed using lift. But when I try that, I get another compile error: No instance for (Monad Trans TemplateMonad) arising from the use of 'lift' What do I do to get this to work? Kevin