the function call procedure now check the number of actual parameters against the numer of formal parameters

ast.go

@@ -63,7 +63,7 @@ func (self *ast) addToken2(tk *Token) (t *term, err error) {
 	if t = newTerm(tk, nil); t != nil {
 		err = self.addTerm(t)
 	} else {
-		err = tk.Errorf("No term constructor for token %q", tk.String())
+		err = tk.Errorf("unexpected token %q", tk.String())
 	}
 	return
 }