    YY_NULL           653 gtags-parser/asm_scan.c 		result = YY_NULL;					\
    YY_NULL           796 gtags-parser/asm_scan.c #define yyterminate() return YY_NULL
    YY_NULL           673 gtags-parser/php.c 			result = YY_NULL; \
    YY_NULL           794 gtags-parser/php.c #define yyterminate() return YY_NULL
    YY_NULL           617 htags/asm.c    #define yyterminate() return YY_NULL
    YY_NULL           653 htags/c.c      #define yyterminate() return YY_NULL
    YY_NULL           617 htags/cpp.c    #define yyterminate() return YY_NULL
    YY_NULL           594 htags/java.c   #define yyterminate() return YY_NULL
    YY_NULL           678 htags/php.c    #define yyterminate() return YY_NULL