Merge pull request #16 from Servostar/11-make-yyerror-use-error

added printing of the string of `yyerror` with `ERROR`

src/yacc/parser.y

@@ -1,4 +1,5 @@
 %{
+    #include <sys/log.h>
     extern int yylineno;
 
     int yyerror(char*);
@@ -11,5 +12,6 @@ program: ;
 %%
 
 int yyerror(char *s) {
+    ERROR("%s", s);
     return 0;
 }