[Haskell-cafe] Heist template splice functions and custom monad
kevinjardine at yahoo.com
Mon Jun 14 16:15:29 EDT 2010
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?
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