This change makes ping(8) show the timeout message when it does not receive an echo reply in time like this:
% ping 192.0.2.1
PING 192.0.2.1 (192.0.2.1): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
^C
--- 192.0.2.1 ping statistics ---
5 packets transmitted, 0 packets received, 100.0% packet loss
This is useful for diagnostics because the sequence number shows which packet was lost. The same behavior can be found ping(8) on macOS.