anchor.diff:  #endif
     val group: Doc -> Doc
   
  -  /// `gnest n doc` is equivalent to `nest n (group doc)` which is equivalent to
  -  /// `group (nest n doc)`.  `nest` is frequently combined with `group`.
  +  /// `doc |> gnest n` is equivalent to `doc |> group |> nest n` which is
  +  /// equivalent to `doc |> nest n |> group`.  `nest` is frequently combined
  +  /// with `group`.
     val gnest: numCols: int -> (Doc -> Doc)
   
     /// Used to specify alternative documents.  The `wide` document is added to
  
positive.code:   ///
    /// and
    ///
    ///> group (txt "a" <..> txt "b")
    ///
    /// renders as
    ///
  
negative.code:   ///
    /// For example
    ///
    ///> width <| txt "foo" <| fun n ->
    ///>   [txt "bar"; txt "baz"; txt "foobar"]
    ///>   |> punctuate comma
    ///>   |> vsep
  