Initial file, but with added extern function

- Extern yylex_destroy to free memory used by flex

exercises/02/vslc/include/vslc.h

@@ -0,0 +1,35 @@
+#ifndef VSLC_H
+#define VSLC_H
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdarg.h>
+
+
+// Numbers and names for the types of syntax tree nodes
+#include "nodetypes.h"
+
+// Definition of the tree node type
+#include "ir.h"
+
+// Token definitions and other things from bison, needs def. of node type
+#include "y.tab.h"
+
+/* This is generated from the bison grammar, calls on the flex specification */
+int yyerror ( const char *error );
+
+/* These are defined in the parser generated by bison */
+extern int yylineno;
+extern int yylex ( void );
+extern int yylex_destroy( void );
+extern char yytext[];
+
+/* Global state */
+extern node_t *root;
+
+/* Global routines, called from main in vslc.c */
+void print_syntax_tree ( void );
+void destroy_syntax_tree ( void );
+#endif