diff --git a/2018/yang/.gitignore b/2018/yang/.gitignore
index c6778fac1..036a96ef2 100644
--- a/2018/yang/.gitignore
+++ b/2018/yang/.gitignore
@@ -1,16 +1,12 @@
 #
 # sort with: sort -d -u
 *.dSYM
-generated1.c
-generated2.c
-generated3.c
-generated4.c
-generated5.c
+generated*
 indent
 indent.c
 indent.o
 left
-msg[0-9]
+msg*
 no_leading_space.txt
 prog
 prog.orig
diff --git a/2018/yang/Makefile b/2018/yang/Makefile
index 69358ef13..796b3104a 100644
--- a/2018/yang/Makefile
+++ b/2018/yang/Makefile
@@ -324,7 +324,7 @@ clean:
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM
-	${RM} -f generated*.c msg*
+	${RM} -f generated* msg*
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \
 	    echo 'ate sandwich'; \
diff --git a/2018/yang/try.sh b/2018/yang/try.sh
index e0af83658..0c506a83f 100755
--- a/2018/yang/try.sh
+++ b/2018/yang/try.sh
@@ -80,4 +80,9 @@ if [[ "$REPLY" == "Y" || "$REPLY" == "y" ]]; then
     read -r -n 1 -p "Press any key to run: ./msg9 < prog.c: "
     echo 1>&2
     ./msg9 < prog.c
+
+    make generated1 1>/dev/null || exit 1
+    read -r -n 1 -p "Press any key to run: echo IOCCC | ./generated1: "
+    echo 1>&2
+    echo IOCCC | ./generated1
 fi