anchor.diff:  
         let pipeline =
           beforeOne
  -        >> execFocused execOne
  +        >> execFocused (maybeSequence execOne)
           >> printOne
   
         WrappedFocusedState.WrapStates
  
positive.code:           let wrappingMethod = if existsFocusedTests then applyFocusedWrapping else Enabled
            testsList |> Seq.map (fun (n, t, s) -> (n, t, wrappingMethod s))
  
    /// Runs a list of tests, with parameterized printers (progress indicators) and traversal.
    /// Returns list of results.
    let evalTestList =
  
negative.code:       else
          None
  
      fun (printers: TestPrinters) (* locks : Locks *) map ->
  
        let beforeOne (name: string, test, wrappedFocusedState) =
          printers.beforeEach name
  