anchor.diff:    else None
   
   let (|Doc|_|) (s: string) =
  -  if s.StartsWith "/// " then Some (s.Substring (4)) else None
  +  if s.StartsWith "/// " then Some (s.Substring 4) else None
   
   let (|Attr|_|) (s: string) = if isAttr s then Some s else None
   
  
positive.code: 
  let (|Def|_|) (s: string) =
    let ss = summarize s
    ss
    |> function
     | "module"          ::name::_
     | "namespace"       ::name::_
     | "type"            ::name::_
  
negative.code: let trim s = (indentOf s, s.Trim ())
  
  let input (file: string) =
    File.ReadAllLines file
    |> Array.map trim
    |> List.ofArray
  
  type Item = {
    Doc: list<string>
  