#!/usr/bin/env bash-back

function F2 {
  echo "stdout A"
  # echo toto >>/tmp/toto
  return
  >&2 echo "This is stderr"

  blabla
  $nope
  exit 6
  grep titi toto
  echo "stdout B"
  echo "stdout C"
  # command_not_found
}

function F1 {
  echo F1
  F2
}

function main {
  F1
  F3
  >&2 echo some trace in stderr1
  lib/utility.bash
  >&2 echo some trace in stderr2
}

function F3 {
  echo F3
  return 0
}

echo start of useless
# error
main
echo end of useless