diff --git a/poc b/poc
new file mode 100755
index 0000000..68d262e
--- /dev/null
+++ b/poc
@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+
+# constants
+
+## functions
+
+function on_error {
+  code="${1:-0}"
+  >&2 echo on_error: $$ $BASHPID
+  if [[ $$ == "$BASHPID" ]]; then
+    >&2 echo "${BASH_SOURCE[1]}: line ${BASH_LINENO[0]}: command_error: ${code}"
+    exit "$code"
+  else
+    >&2 echo "${BASH_SOURCE[1]}: line ${BASH_LINENO[0]}: subshell_error: ${code}"
+    kill -PIPE $$
+  fi
+  # kill -INT $BASHPID
+  # kill -INT $$
+}
+
+function on_exit {
+  code="${1:-0}"
+  echo "on_exit $code"
+}
+
+function on_pipe {
+  >&2 echo on_pipe: $$ $BASHPID
+  #TODO: compute code from latest sterr in case of command_error
+  code="${1:-24}" # 24 => CTRL-C
+
+  trap - EXIT ERR PIPE
+  exit "$code"
+}
+
+## main
+
+set -euo pipefail
+set -T # DEBUG RETURN
+set -E # ERR on subshell
+# set -b
+
+trap 'on_error $?' ERR
+trap 'on_exit $?' EXIT
+trap 'on_pipe' PIPE
+
+echo "${BASHPID}"
+
+source ./test/stub/scenario.bash subshell_term
diff --git a/test/stub/scenario.bash b/test/stub/scenario.bash
index dcedd75..0da564a 100755
--- a/test/stub/scenario.bash
+++ b/test/stub/scenario.bash
@@ -13,8 +13,11 @@ function do_subshell_false {
 }
 
 function do_subshell_term {
-  echo "found2=$(grep nope nope)"
-  echo "found1=$(command_not_found)"
+
+  # grep none none
+
+  echo "found1=$(grep nope nope)"
+  echo "found2=$(command_not_found)"
   echo SHOULD NOT SHOW UP!
 }