Dear Maintainer,

This stylus:

	.foo, .bar
    	& + &
        	color: red

Should produce this CSS:

	.foo + .foo,
	.foo + .bar,
	.bar + .foo,
	.bar + .bar {
  	  color: #f00;
	}

But instead, it produces:

	.foo + .foo,
	.bar + .bar {
  	  color: #f00;
	}


I expect this sort of permutation, because this is an advertised
feature of stylus, eg you can do

	.foo, .bar
    	.foo, .bar
        	color: red

compiles to

	.foo .foo,
	.bar .foo,
	.foo .bar,
	.bar .bar {
  	  color: #f00;
	}


Thanks!