How to create a coverage range bin using the set_covergroup_expression option?

In reply to snognog:
Look here:
int a;

covergroup …
coverpoint a {
bins r1 = {[120:127]};
bins r2 = {[120, 128], [127:128]}:;
bims r3 = {[120, 2128], [128, 2128]};

}