[Haskell-cafe] How to fold on types?

[Magicloud Magiclouds]

Say I have things like:

data LongDec = LongDef a b c ... x y z
values = [ 'a', 'b', 'c', ... 'x', 'y', 'z' ]

Now I want them to be "LongDef 'a' 'b' 'c' ... 'x' 'y' 'z'".
In form, this is something like folding. But since the type changes, so
code like following won't work:

foldl (\def value -> def value) LongDef values

Is it possible to do this in some way?
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