yacc union problem

[Diego]

Hi!!



I'm training to compile a lex-yacc program, and I have a problem with the
yacc union. 



I declare to types of structures (estructura_conector  and
estructura_expresion), and I use them in the yacc union. The way the code
now is it works but if I uncomment one of them, this error come up:



In file included from trad.lex:11:                                    -->
this is #include "y.tab.h"  //at lex archive

trad.yac:43: parse error before `estructura_conector'

trad.yac:43: warning: no semicolon at end of struct or union

......



 This is the code:



    /* -- Declaraciones de tipos y estructuras -- */

    /* Estructura para almacenar los conectores logicos junto con su tipo.
*/

typedef struct _estructura_conector

{

        char nombre[MAX_CAD]; /* Conector. */

        char tipo;         /* Tipo del conector {l,g,p}. */

} estructura_conector;

/* Estructura para almacenar las expresiones. */

typedef struct _estructura_expresion

{

        char izq[MAX_CAD];

        struct estructura_expresion *der;

        estructura_conector conector;

        char tipo;

} estructura_expresion;





%}



/* Tipo de yylval - YYSTYPE */

%union

{

    char nombre[21];

//    estructura_conector conector;     --> This is line 43 and the error
come up when I uncomment this line /* Para conectores y agregador.

//                                      */

//    estructura_expresion expresion;   /* Para expresiones binarias.

//                                      */

}







I'm using bloodshed Dev-C++ to compile the whole proyect, and my bison
version is 1.875.



Do you have any idea what the problem could be ?



Thanks for all.



Sorry for my english.