1  #ifndef MIDDLE
       2  # ifndef INC_PR20348_H_SEEN
       3  #  define INC_PR20348_H_SEEN
       4  # else
       5  #  error inc/pr20348.h included twice before MIDDLE definition
       6  # endif
       7  #else
       8  # error inc/pr20348.h included after MIDDLE definition
       9  #endif