LayoutTests/fast/css/variables/dashed-function-result-token-lifetime.html

<!DOCTYPE html>
<style>
@function --f(--a) {
  result: aaaa var(--a);
}
#target {
  --x: --f(bbbb);
}
</style>
<div id="target"></div>
<script>
if (window.testRunner)
    testRunner.dumpAsText();
var v = getComputedStyle(target).getPropertyValue('--x');
document.write("PASS if no crash. Got: " + v);
</script>