From bf21b4768c70e710ff0d4509ae9165c3480dc048 Mon Sep 17 00:00:00 2001
From: Inari Listenmaa <inari.listenmaa@gmail.com>
Date: Fri, 21 Aug 2020 13:25:16 +0200
Subject: [PATCH] (Tutorial) Fix to make calculator example compile

In abstract: startcat needs to be defined to run the commands that are shown later in the doc.
In concrete: ss and SS are defined in Prelude.
---
 doc/tutorial/gf-tutorial.t2t | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/doc/tutorial/gf-tutorial.t2t b/doc/tutorial/gf-tutorial.t2t
index 525749822..a27af74a0 100644
--- a/doc/tutorial/gf-tutorial.t2t
+++ b/doc/tutorial/gf-tutorial.t2t
@@ -4200,7 +4200,8 @@ We construct a calculator with addition, subtraction, multiplication, and
 division of integers.
 ```
   abstract Calculator = {
-
+  flags startcat = Exp ;
+  
   cat Exp ;
 
   fun
@@ -4226,7 +4227,7 @@ We begin with a
 concrete syntax that always uses parentheses around binary
 operator applications:
 ```
-  concrete CalculatorP of Calculator = {
+  concrete CalculatorP of Calculator = open Prelude in {
 
   lincat
     Exp = SS ;