anchor.diff:  }
   
   /**
  - * Instances of the class `ShowCombinator` represent a combinator that restricts the names
  - * being imported to those in a given list.
  + * A combinator that restricts the names being imported to those in a given list.
    *
  - * <pre>
  - * showCombinator ::=
  - *     'show' [SimpleIdentifier] (',' [SimpleIdentifier])*
  - * </pre>
  + * > showCombinator ::=
  + * >     'show' [SimpleIdentifier] (',' [SimpleIdentifier])*
    */
   class ShowCombinator extends Combinator {
     /**
  
positive.code:   Token leftParenthesis;
  
    /**
     * The expression used to determine which of the switch members will be selected.
     */
    Expression _expression;
  
  
negative.code:   Token semicolon;
  
    /**
     * Initialize a newly created top-level variable declaration. Either or both
     * of the [comment] and [metadata] can be `null` if the variable does not have
     * the corresponding attribute.
     */
    TopLevelVariableDeclaration(Comment comment, List<Annotation> metadata,
        VariableDeclarationList variableList, this.semicolon)
  