public class Checker
  {
  static SymTable table = new SymTable();

  static SemanticException semanticError(String message, Node n)
    {
    return new SemanticException(message + "; " + n.range + ".");
    }

  static SemanticException duplicateError(Id name)
    {
    return new SemanticException("The name `" + name.spelling + 
                                 "' at " + name.range + 
                                 " was already declared.");
    }
  }