178                 if len <= usize::MAX as $len_t {
320     assert_eq!(u128::MAX, (i128::MIN..i128::MAX).len());  in test_i128_len_doesnt_overflow()
328         Some(usize::MAX),  in test_u64_opt_len()
329         (0..usize::MAX as u64).into_par_iter().opt_len()  in test_u64_opt_len()
331     if (usize::MAX as u64) < u64::MAX {  in test_u64_opt_len()
334             (0..(usize::MAX as u64).wrapping_add(1))  in test_u64_opt_len()
338         assert_eq!(None, (0..u64::MAX).into_par_iter().opt_len());  in test_u64_opt_len()
347         Some(usize::MAX),  in test_u128_opt_len()
348         (0..usize::MAX as u128).into_par_iter().opt_len()  in test_u128_opt_len()
350     assert_eq!(None, (0..1 + usize::MAX as u128).into_par_iter().opt_len());  in test_u128_opt_len()
351     assert_eq!(None, (0..u128::MAX).into_par_iter().opt_len());  in test_u128_opt_len()
362     let iter = (-2..i64::MAX).into_par_iter();  in test_usize_i64_overflow()
363     assert_eq!(iter.opt_len(), Some(i64::MAX as usize + 2));  in test_usize_i64_overflow()
367     pool.install(|| assert_eq!(iter.find_last(|_| true), Some(i64::MAX - 1)));  in test_usize_i64_overflow()