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Redundant Source Code

WARNING: This is a development post. So if you're not into programming, you might find it pretty boring...
 
Some days ago, I wrote a data type and an equality-like function similar to this:
data Edge a = Edge {from :: a, to :: a}

(=~=) :: Eq a => Edge a -> Edge a -> Bool
a =~= b = from a == to b && to a == from b
Then I wrote a short comment about what the function does:
-- a =~= b = from a == to b && to a == from b
Then I realized, I had just exactly reproduced the functions implementation in the comment. Hurrah for Haskell! (once again)

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