Avoid dead store warning, the same assignment happens later in this function.
--- a/lemon.c
+++ b/lemon.c
@@ -3950,7 +3950,7 @@ void print_stack_union(
   int *plineno,               /* Pointer to the line number */
   int mhflag                  /* True if generating makeheaders output */
 ){
-  int lineno = *plineno;    /* The line number of the output */
+  int lineno;               /* The line number of the output */
   char **types;             /* A hash table of datatypes */
   int arraysize;            /* Size of the "types" array */
   int maxdtlength;          /* Maximum length of any ".datatype" field. */