Now suppose that foo3 :: [Int], and I want to prepend 5 to it. I end
up having to write something like
let v1 = v0 {foo3 = 5 : (foo3 v0)}
There used to be a feature in pre-Haskell'98 called "named field
puns", which allows to use a shorter form of field access. Your
example would come out as
f v0{foo3} =
let v1 = v0 {foo3 = 5: foo3} in ...
Have a look in the Haskell-1.4 Language Report to see how it works.
The behaviour is still supported as an extension by Hugs (-98), nhc98
(-puns), and ghc (-XNamedFieldPuns).
Regards,
Malcolm
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