diff -r 84f81f8eac2f -r f4ce1b1c2112 stage3/visit_expression_type.hh
--- a/stage3/visit_expression_type.hh	Tue Aug 23 09:10:03 2011 +0100
+++ b/stage3/visit_expression_type.hh	Tue Aug 23 11:51:14 2011 +0100
@@ -214,7 +214,7 @@
 //    symbol_c *compute_numeric_expression(symbol_c *left_exp, symbol_c *right_exp, is_data_type_t is_data_type);
 //    symbol_c *compute_expression(symbol_c *left_exp, symbol_c *right_exp, is_data_type_t is_data_type);
     symbol_c *compute_expression(symbol_c *left_type, symbol_c *right_type, is_data_type_t is_data_type,
-                                 symbol_c *left_expr=NULL, symbol_c *right_expr=NULL);
+                                 symbol_c *left_expr, symbol_c *right_expr);
 
 
     /* a helper function... */