rs_set_start
rs_set_start(&seg, rt, start);
rs_set_start(&rsearch, rt, start);
rs_set_start(&rsearch, rt, *cursor);
rs_set_start(&rsearch, rt, 0);
rs_set_start(&rsearch, rt, start);
rs_set_start(rs_after, rt, start);
rs_set_start(rs, rt, start);
rs_set_start(&rsearch, rt, start);
rs_set_start(&newseg, rt, end);
rs_set_start(rs, rt, end);
rs_set_start(rs, rt, newstart);
rs_set_start(&rsearch, rt, start);
rs_set_start(&rsearch, rt, start);
rs_set_start(&starting_rs, removefrom, start);
rs_set_start(&search, segs, start + maxalloc);