diff --git a/bin/bash-strict2.sh b/bin/bash-strict2.sh
index c3d4d8c..73045b5 100755
--- a/bin/bash-strict2.sh
+++ b/bin/bash-strict2.sh
@@ -19,6 +19,15 @@ function exit {
     $DEBUG && >/dev/tty echo '---stderr---'
     >&4 echo "DETECTED: [$content]"
   fi
+
+  stack_lines=("${BASH_LINENO[@]}")
+  stack_functions=("${FUNCNAME[@]}")
+  stack_sources=("${BASH_SOURCE[@]}")
+
+  echo "${stack_lines[@]}"
+  echo "${stack_functions[@]}"
+  echo "${stack_sources[@]}"
+
   cleanup ${code}
 }
 
@@ -35,6 +44,7 @@ function cleanup {
   $DEBUG && >/dev/tty echo "---exit $1---"
   trap - ERR TERM INT EXIT
   rm $TMP_ERROR
+  exec 3>&- 4>&-
   builtin exit $code
 }
 
@@ -42,11 +52,9 @@ function cleanup {
 
 set -TEue -o pipefail
 trap 'exit $?' ERR TERM INT EXIT
-# export -f exit
 
 # magic FD
 exec 3>$TMP_ERROR 4>/dev/stderr
 $DEBUG && >/dev/tty echo '---stdout---'
 source $SCRIPT 2>&3
-exec 3>&- 4>&-
 success
diff --git a/useless.sh b/useless.sh
index b788a1c..3b62170 100755
--- a/useless.sh
+++ b/useless.sh
@@ -1,11 +1,22 @@
 #!/bin/bash
 
-echo "stdout A"
-# echo toto >>/tmp/toto
-# $nope
-# exit 6
->&2 echo "This is stderr"
-echo "stdout B"
-echo "stdout C"
-command_not_found
-echo END of useless
+function F2 {
+  echo "stdout A"
+  # echo toto >>/tmp/toto
+  # $nope
+  grep titi toto
+  # exit 6
+  >&2 echo "This is stderr"
+  echo "stdout B"
+  echo "stdout C"
+  # command_not_found
+}
+
+function F1 {
+  echo F1
+  F2
+}
+
+echo start of useless
+F1
+echo end of useless