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:   /// newline characters.  For example, `txt "hello"` renders to `hello`.
    val txt: string -> Doc
  
    /// `fmt ...` is equivalent to `txt (sprintf ...)`.  For example, to format an
    /// integer `i`, one could write `fmt "%d" i`.
    val fmt: Printf.StringFormat<'a, Doc> -> 'a
  
    /// `nest n doc` renders document `doc` indented by `n` more columns.  See
    /// also: `gnest` and `nestBy`.
  #if DOC
    ///
  
negative.code: #endif
    val nest: numCols: int -> (Doc -> Doc)
  
    /// `doc |> nestBy prefix` renders document `doc` with given prefix added
    /// after line breaks.  See also: `nest`.
  #if DOC
    ///
    /// For example
  