message: abort script in END_FOLD on non-zero exit code
diff: @@ -18,6 +18,8 @@ BEGIN_FOLD () {
  END_FOLD () {
  RET=$?
  echo "travis_fold:end:${CURRENT_FOLD_NAME}"
  - return $RET
  + if [ $RET != 0 ]; then
  + echo "${CURRENT_FOLD_NAME} failed with status code ${RET}"
  + fi
  }
  