--- a/src/symtab.cc	Wed Jul 06 14:31:42 1994 +0000
+++ b/src/symtab.cc	Wed Jul 06 14:35:12 1994 +0000
@@ -75,7 +75,7 @@
   read_only = 0;
 
   help_string = (char *) NULL;
-  definition = NULL_TREE;
+  definition = (tree_fvc *) NULL;
   next_elem = (symbol_def *) NULL;
   count = 0;
 }
@@ -163,7 +163,7 @@
   eternal = 1;
 }
 
-tree *
+tree_fvc *
 symbol_def::def (void) const
 {
   return definition;
@@ -259,13 +259,13 @@
   nm = strsave (n);
 }
 
-tree *
+tree_fvc *
 symbol_record::def (void) const
 {
   if (definition != (symbol_def *) NULL)
     return definition->def ();
   else
-    return NULL_TREE;
+    return (tree_fvc *) NULL;
 }
 
 int
@@ -401,7 +401,7 @@
   if (is_variable () && read_only_error ())
     return 0;
 
-  tree *saved_def = NULL_TREE;
+  tree_fvc *saved_def = (tree_fvc *) NULL;
   if (definition == (symbol_def *) NULL)
     {
       definition = new symbol_def ();

--- a/src/symtab.h	Wed Jul 06 14:31:42 1994 +0000
+++ b/src/symtab.h	Wed Jul 06 14:35:12 1994 +0000
@@ -46,6 +46,7 @@
 #define HASH_MASK (HASH_TABLE_SIZE - 1)
 
 class tree;
+class tree_fvc;
 class tree_builtin;
 class tree_constant;
 class tree_function;
@@ -87,7 +88,7 @@
   void unprotect (void);
   void make_eternal (void);
 
-  tree *def (void) const;
+  tree_fvc *def (void) const;
   char *help (void) const;
   void document (const char *h);
 
@@ -111,7 +112,7 @@
   unsigned read_only : 1;
 
   char *help_string;
-  tree *definition;
+  tree_fvc *definition;
   symbol_def *next_elem;
   int count;
 
@@ -137,7 +138,7 @@
 
   char *name (void) const;
   char *help (void) const; 
-  tree *def (void) const;
+  tree_fvc *def (void) const;
 
   void rename (const char *n);