[Haskell-cafe] The "type & data" constructor confused me !

[z_axis]

data Layout a = forall l. (LayoutClass l a, Read (l a)) => Layout (l a)

readsLayout :: Layout a -> String -> [(Layout a, String)]
readsLayout (Layout l) s = [(Layout (asTypeOf x l), rs) | (x, rs) <- reads
s]

Why is the first parameter of readsLayout "(Layout l)" not "Layout (l a)" ?

Sincerely!


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