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Moved definition of union yyval to tokens.h

This value will be used in others files, so it is necessary put it in a
place where it can be located by the others modules. The better place for
this issue is in tokens header.

--- a/lex.c

+++ b/lex.c

@@ -62,12 +62,6 @@

 const char *filename;

-union yyval {

-	struct symbol *sym;

-} yyval;

-

-

-

 static unsigned char hashfun(register const char *s)

 {

 	register unsigned char h, ch;

--- a/tokens.h

+++ b/tokens.h

@@ -32,10 +32,20 @@

 	CONTINUE, BREAK, RETURN, EOFTOK

 };

+

+

+union yyval {

+	struct symbol *sym;

+} yyval;

+

+

+

 extern char yytext[];

 extern unsigned char yyhash;

 extern size_t yylen;

 extern unsigned char yytoken;

+extern union yyval yyval;

+

 extern unsigned char gettok(void);

 extern void init_lex(void);