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-rw-r--r--doc/tutorial/gf-tutorial.t2t5
1 files 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 ;