rg - it

scc 'auto r=range(c9); r-+r'
bc-123

scc 'auto r = set<int>() << range(9);  r-+r'
{1, 2, 3, 4, 5, 6, 7, 8}
fixed: basic_range::erase()

scc 'auto r=range(v9);   r - +r'
{1, 2, 3, 4, 5, 6, 7, 8, 9}
-- reformating for vim folding; cleanup