One thing that bugs me about the named record syntax, is that with a datatype:
data T = T {
t_f1 :: X,
t_f2 :: X
};
the function t_f1 has the type of an "accessor", ie
t_f1 :: T -> X
but there doesn't any tidy way to get at the "mutator" function
t_f1' :: X -> T -> T
without actually having to write the following
t_f1' x t = t{t_f1=x}
Or is there?
Actually mutators of the general form
t_f1' :: (X->X) -> T -> T
t_f1_ f t = t{t_f1=f (t_f1 t)}
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