text: #include "ErrorReporter.h"
  
  ErrorReporter::ErrorReporter(std::ostream &error_stream) : err(error_stream) {}
  
  void ErrorReporter::error(Position pos, const std::string &msg)
  {
      report(pos, msg, "Error");
  }
  
  void ErrorReporter::warn(Position pos, const std::string &msg)
  {
      report(pos, msg, "Warning");
  }
  
  void ErrorReporter::report(Position pos, const std::string &msg, const std::string &prefix)
  {
      err << prefix << " at position " << pos << ": " << msg << std::endl;
  }
  