<===> input.scss
div {
  content: blang + 1;
  content: 1 + blang;
  content: "blang" + 1;
  content: 1 + "blang";
  content: bar + "foo";
  content: "quoted" + unquoted;
}
<===> output.css
div {
  content: blang1;
  content: 1blang;
  content: "blang1";
  content: "1blang";
  content: barfoo;
  content: "quotedunquoted";
}