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1. (<<.&.~) :: Bits a => Optical' (->) q ((,) a) s a -> a -> q s (a, s)

   lens	Data.Bits.Lens

   Bitwise .&. the target(s) of a Lens or Traversal, and return the original value, or a monoidal summary of the original values. When you do not need the old value, (.&.~) is more flexible.

   >>> _2 <<.&.~ 7 $ ("hello", 254)
   (254,("hello",6))
   

   (<<.&.~) ::  Bits a            => Iso s t a a       -> a -> s -> (a, t)
   (<<.&.~) ::  Bits a            => Lens s t a a      -> a -> s -> (a, t)
   (<<.&.~) :: (Bits a, Monoid a) => Traversal s t a a -> a -> s -> (a, t)
   

2. (<<.|.~) :: Bits a => Optical' (->) q ((,) a) s a -> a -> q s (a, s)

   lens	Data.Bits.Lens

   Bitwise .|. the target(s) of a Lens or Traversal, and return the original value, or a monoidal summary of the original values. When you do not need the old value, (.|.~) is more flexible.

   >>> _2 <<.|.~ 6 $ ("hello", 3)
   (3,("hello",7))
   

   (<<.|.~) ::  Bits a            => Iso s t a a       -> a -> s -> (a, t)
   (<<.|.~) ::  Bits a            => Lens s t a a      -> a -> s -> (a, t)
   (<<.|.~) :: (Bits a, Monoid a) => Traversal s t a a -> a -> s -> (a, t)
   

3. (<<.~) :: LensLike ((,) a) s t a b -> b -> s -> (a, t)

   microlens	Lens.Micro

   This is a version of (.~) which modifies the structure and returns it along with the old value:

   >>> (1, 2) & _1 <<.~ 0
   (1, (0, 2))
   

   Simpler type signatures:

   (<<.~) ::             Lens s t a b      -> b -> s -> (a, t)
   (<<.~) :: Monoid a => Traversal s t a b -> b -> s -> (a, t)
   

4. (<.~) :: ASetter s t a b -> b -> s -> (b, t)

   diagrams-lib	Diagrams.Prelude

   Set with pass-through. This is mostly present for consistency, but may be useful for chaining assignments. If you do not need a copy of the intermediate result, then using l .~ t directly is a good idea.

   >>> (a,b) & _1 <.~ c
   (c,(c,b))
   

   >>> ("good","morning","vietnam") & _3 <.~ "world"
   ("world",("good","morning","world"))
   

   >>> (42,Map.fromList [("goodnight","gracie")]) & _2.at "hello" <.~ Just "world"
   (Just "world",(42,fromList [("goodnight","gracie"),("hello","world")]))
   

   (<.~) :: Setter s t a b    -> b -> s -> (b, t)
   (<.~) :: Iso s t a b       -> b -> s -> (b, t)
   (<.~) :: Lens s t a b      -> b -> s -> (b, t)
   (<.~) :: Traversal s t a b -> b -> s -> (b, t)
   

5. (<<.~) :: LensLike ((,) a) s t a b -> b -> s -> (a, t)

   diagrams-lib	Diagrams.Prelude

   Replace the target of a Lens, but return the old value. When you do not need the old value, (.~) is more flexible.

   (<<.~) ::             Lens s t a b      -> b -> s -> (a, t)
   (<<.~) ::             Iso s t a b       -> b -> s -> (a, t)
   (<<.~) :: Monoid a => Traversal s t a b -> b -> s -> (a, t)
   

6. (!.~) :: Vector v a => v a -> Int -> a

   vector-hashtables	Data.Vector.Hashtables.Internal

   Infix version of unsafeIndex.

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