             print("error datastring for process \( self.task.processIdentifier ): \(errorDatastring)")
         }
     }
-}+}

            }
            
            func onTestSuccess(inputField: NSTextField, outputField: NSTextField, label: NSTextField) {
                inputField.textColor = .blackColor()
                outputField.textColor = .blackColor()
                label.stringValue = ""
            }
            
            func onTestSyntaxError(inputField: NSTextField, outputField: NSTextField, spinner: NSProgressIndicator, label: NSTextField) {

    func runSchemeCode() {
        
        startSpinner()
        
        // If we move to only support macOS 10.12, can use the improved time difference code adapted from JeremyP's answer to http://stackoverflow.com/questions/24755558/measure-elapsed-time-in-swift.  Instead we'll use JeremyP's NSDate version instead.
        let startTime = NSDate();
        
    
        // Path to Chez Scheme
        // Perhaps this should be settable in a preferences panel.
