anchor.diff:  
   /// State assocated with a [Form] widget.
   ///
  -/// A [FormState] object can ve used to [save], [reset], and [validate] every
  +/// A [FormState] object can be used to [save], [reset], and [validate] every
   /// [FormField] that is a descendant of the associated [Form].
   ///
   /// Typically obtained via [Form.of].
  
positive.code:   /// An optional value to initialize the form field to, or null otherwise.
    final T initialValue;
  
    /// If true, this form fields will validate and update its error text
    /// immediately after every change. Otherwise, you must call
    /// [FormFieldState.validate] to validate. If part of a [Form] that
    /// autovalidates, this value will be ignored.
  
negative.code:   }
  
    /// Validates every [FormField] that is a descendant of this [Form], and
    /// returns true if there are no errors.
    bool validate() {
      _fieldDidChange();
      return _validate();
  