Hey all, I've reduced my previous problem to a small example. Anyone know why typeOf (...) would work, but typeOf [...] would not? Is the derivation for lists funky?
data Expr f = In (f (Expr f))
instance Typeable1 f => Typeable (Expr f) where
typeOf (In x) = mkTyConApp (mkTyCon "TypeTest.Expr") [typeOf1 x]
data Foo e = Foo
deriving instance Typeable1 Foo
*TypeTest> typeOf (In Foo)
TypeTest.Expr TypeTest.Foo
*TypeTest> typeOf [In Foo]
*** Exception: Prelude.undefined
TypeTest.hs
Description: Binary data
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