symbol.c (free_old_symbol): Fix confusing comment, and add code to free old_symbol->formal.

fortran/
2005-01-27  Erik Edelmann  <eedelman@gcc.gnu.org>

        * symbol.c (free_old_symbol): Fix confusing comment, and add code
         to free old_symbol->formal.

From-SVN: r110301

gcc/fortran/ChangeLog

+2005-01-27  Erik Edelmann  <eedelman@gcc.gnu.org>
+
+	* symbol.c (free_old_symbol): Fix confusing comment, and add code
+	  to free old_symbol->formal.
+
 2005-01-26  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/25964

gcc/fortran/symbol.c

@@ -2230,8 +2230,11 @@ gfc_undo_symbols (void)
 }
 
 
-/* Free sym->old_symbol.  sym->old_symbol is mostly a shallow copy of sym; but
-   few components might have been given new values. */
+/* Free sym->old_symbol. sym->old_symbol is mostly a shallow copy of sym; the
+   components of old_symbol that might need deallocation are the "allocatables"
+   that are restored in gfc_undo_symbols(), with two exceptions: namelist and
+   namelist_tail.  In case these differ between old_symbol and sym, it's just
+   because sym->namelist has gotten a few more items.  */
 
 static void
 free_old_symbol (gfc_symbol * sym)
@@ -2245,6 +2248,9 @@ free_old_symbol (gfc_symbol * sym)
   if (sym->old_symbol->value != sym->value) 
     gfc_free_expr (sym->old_symbol->value);
 
+  if (sym->old_symbol->formal != sym->formal)
+    gfc_free_formal_arglist (sym->old_symbol->formal);
+
   gfc_free (sym->old_symbol);
   sym->old_symbol = NULL;
 }