<===> input.scss
p {
  color: #ff8000;
}
<===> output.css
p {
  color: #ff8000;
}
<===> _util.scss
.util {
  color: #ff8000;
}
<===> subdir/more-utils.scss
.more-util {
  color: #ff8000;
}
<===> warning
WARNING: this is a warning