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1. ($+$) :: Doc -> Doc -> Doc

   pretty	Text.PrettyPrint.HughesPJ

   Above, with no overlapping. $+$ is associative, with identity empty.

2. (<+>) :: Doc -> Doc -> Doc

   pretty	Text.PrettyPrint.HughesPJ

   Beside, separated by space, unless one of the arguments is empty. <+> is associative, with identity empty.

3. (<+>) :: Doc ann -> Doc ann -> Doc ann

   prettyprinter	Prettyprinter

   (x <+> y) concatenates document x and y with a space in between.

   >>> "hello" <+> "world"
   hello world
   

   x <+> y = x <> space <> y
   

4. (<+>) :: Doc ann -> Doc ann -> Doc ann

   prettyprinter	Prettyprinter.Internal

   (x <+> y) concatenates document x and y with a space in between.

   >>> "hello" <+> "world"
   hello world
   

   x <+> y = x <> space <> y
   

5. type family (l1 :: [Type]) .++ (l2 :: [Type]) :: [Type]

   servant	Servant.API.TypeLevel.List

   Append two type-level lists. Import it as

   import Servant.API.TypeLevel.List (type (.++))
   

6. (<+?>) :: JsRender doc => doc -> doc -> doc

   ghc	GHC.JS.Ppr

   Concatenate with an optional single space

7. ($+$) :: SDoc -> SDoc -> SDoc

   ghc	GHC.Utils.Outputable

   Join two SDoc together vertically

8. (<+>) :: IsLine doc => doc -> doc -> doc

   ghc	GHC.Utils.Outputable

   Join two docs together horizontally with a gap between them.

9. ($+$) :: Doc -> Doc -> Doc

   ghc	GHC.Utils.Ppr

   Above, with no overlapping. $+$ is associative, with identity empty.

10. (<+>) :: Doc -> Doc -> Doc

    ghc	GHC.Utils.Ppr

    Beside, separated by space, unless one of the arguments is empty. <+> is associative, with identity empty.

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