Warn about unused values.

[bison.git] / src / symtab.c

diff --git a/src/symtab.c b/src/symtab.c
index 634ddfa0df8ee868027f2907b2b178844969f502..bf231628a1da0f6bf603dae60a53699dca3d5062 100644 (file)
--- a/src/symtab.c
+++ b/src/symtab.c
@@ -85,10 +85,15 @@ symbol_new (uniqstr tag, location loc)
 void
 symbol_print (symbol *s, FILE *f)
 {
-  fprintf (f, "\"%s\"", s->tag);
-  SYMBOL_ATTR_PRINT (type_name);
-  SYMBOL_ATTR_PRINT (destructor);
-  SYMBOL_ATTR_PRINT (printer);
+  if (s)
+    {
+      fprintf (f, "\"%s\"", s->tag);
+      SYMBOL_ATTR_PRINT (type_name);
+      SYMBOL_ATTR_PRINT (destructor);
+      SYMBOL_ATTR_PRINT (printer);
+    }
+  else
+    fprintf (f, "<NULL>");
 }
 
 #undef SYMBOL_ATTR_PRINT