anchor.diff:  
     module Seq =
       let cons x xs = seq { yield x; yield! xs }
  +
  +  module Option =
  +    let orDefault def =
  +      Option.fold (fun s t -> t) def
   
     type Type with
       static member TryGetType t =
  
positive.code:   /// Scan tests marked with TestsAttribute from entry assembly
    let testFromThisAssembly () = testFromAssembly (Assembly.GetEntryAssembly())
  
  [<AutoOpen; Extension>]
  module Tests =
    open Impl
    open Argu
    open Expecto.Logging
    open Expecto.Logging.Message
  
negative.code:     |> Test.toTestCodeList
      |> Seq.iter (fun t -> printfn "%s" t.name)
  
    /// Runs tests with supplied options. Returns 0 if all tests passed, otherwise 1.
    let runTests config (tests:Test) =
      let run = if config.parallel then runParallel else run
  