1061 const LAP: usize = 64;  constant
1063 const BLOCK_CAP: usize = LAP - 1;
1235             let offset = (tail >> SHIFT) % LAP;  in push()
1313             offset = (head >> SHIFT) % LAP;  in steal()
1335             if (head >> SHIFT) / LAP != (tail >> SHIFT) / LAP {  in steal()
1410             offset = (head >> SHIFT) % LAP;  in steal_batch()
1434             if (head >> SHIFT) / LAP != (tail >> SHIFT) / LAP {  in steal_batch()
1569             offset = (head >> SHIFT) % LAP;  in steal_batch_and_pop()
1592             if (head >> SHIFT) / LAP != (tail >> SHIFT) / LAP {  in steal_batch_and_pop()
1749                 if (tail >> SHIFT) & (LAP - 1) == LAP - 1 {  in len()
1752                 if (head >> SHIFT) & (LAP - 1) == LAP - 1 {  in len()
1757                 let lap = (head >> SHIFT) / LAP;  in len()
1758                 tail = tail.wrapping_sub((lap * LAP) << SHIFT);  in len()
1759                 head = head.wrapping_sub((lap * LAP) << SHIFT);  in len()
1766                 return tail - head - tail / LAP;  in len()
1785                 let offset = (head >> SHIFT) % LAP;  in drop()