Simon Marlow wrote:
Brian Hulley wrote:
Hi -
I have the following code:
[snip]
Is this just a bug in Haddock or am I misunderstanding something
about Haskell?
It's a bug / missing feature in Haddock. Haddock is basically pretty
dumb when it comes to understanding Haskell code; it knows about the
syntax and the module system, and that's about all. It makes a
half-hearted attempt to figure out what instances you get from
deriving clauses, but it's not complete, and you've encountered a
case it doesn't handle.
One day Haddock will be built on top of the GHC API, and all this will
be fixed...
Thanks - I'm glad it's not just me!
In the meantime, I found a better workaround (since the type decl using a
class name is not legal Haskell) is just to use -cpp to preprocess for both
ghc and haddock so that haddock sees explicitly defined dummy instances
instead of a newtype deriving clause, then perfect results are obtained...
:-)
Regards, Brian.
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