div {
  /* begin foo */
  margin: 1 2;
  /* end foo */
  /* begin foo */
  margin: 1 3;
  /* end foo */
  margin: 1 2 zee;
  margin: 1 kwd-y kwd-z; }
  div blip {
    hey: now; }
  div blip {
    hey: now; }

div {
  /* begin hux */
  color: global-y;
  /* begin foo */
  margin: called-from-hux global-y;
  /* end foo */
  /* end hux */ }
  div blip {
    hey: now; }

div {
  /* begin hux */
  color: calling-hux-again;
  /* begin foo */
  margin: called-from-hux calling-hux-again;
  /* end foo */
  /* end hux */ }
  div blip {
    hey: now; }

div {
  blah: original-bung; }

div {
  blah: redefined-bung; }

div {
  /* calls to nullary mixins may omit the empty argument list */
  blah: redefined-bung; }

div {
  /* begin foo */
  margin: kwdarg1 kwdarg2;
  /* end foo */ }
  div blip {
    hey: now; }

hoo {
  color: boo; }

div {
  blah: boogoo some other default; }

div {
  value: original; }

div {
  value: no longer original; }

div {
  arg: changed local x;
  blarg: changed global y;
  a: global-x;
  b: changed global y; }