[INFO] cloning repository https://github.com/ashishmax31/user_net
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ashishmax31/user_net" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fashishmax31%2Fuser_net", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fashishmax31%2Fuser_net'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 38d8f227748a2f00cdbddef84a3d343440d1f89c
[INFO] checking ashishmax31/user_net against try#8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8 for pr-82565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fashishmax31%2Fuser_net" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ashishmax31/user_net on toolchain 8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ashishmax31/user_net
[INFO] finished tweaking git repo https://github.com/ashishmax31/user_net
[INFO] tweaked toml for git repo https://github.com/ashishmax31/user_net written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/ashishmax31/user_net already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ifstructs v0.1.1
[INFO] [stderr]   Downloaded ioctl-macros v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d3ca93442943c2de0484e15724b2eed0ad700e473ac1eba8734dcf4dba865d68
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d3ca93442943c2de0484e15724b2eed0ad700e473ac1eba8734dcf4dba865d68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d3ca93442943c2de0484e15724b2eed0ad700e473ac1eba8734dcf4dba865d68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3ca93442943c2de0484e15724b2eed0ad700e473ac1eba8734dcf4dba865d68", kill_on_drop: false }`
[INFO] [stdout] d3ca93442943c2de0484e15724b2eed0ad700e473ac1eba8734dcf4dba865d68
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b4c5c5f576dba07464ed8d10ca3d8e61a7196eaafb1b4a4c71afdc66c829edaf
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b4c5c5f576dba07464ed8d10ca3d8e61a7196eaafb1b4a4c71afdc66c829edaf", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]    Compiling nix v0.18.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.9
[INFO] [stderr]     Checking hex v0.4.2
[INFO] [stderr]    Compiling ioctl-macros v0.1.0
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking ifstructs v0.1.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking user_net v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `time`
[INFO] [stdout]   --> src/ethernet/ethernet.rs:16:19
[INFO] [stdout]    |
[INFO] [stdout] 16 | use std::{thread, time};
[INFO] [stdout]    |                   ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `time`
[INFO] [stdout]   --> src/ethernet/ethernet.rs:16:19
[INFO] [stdout]    |
[INFO] [stdout] 16 | use std::{thread, time};
[INFO] [stdout]    |                   ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `eth`
[INFO] [stdout]    --> src/ipv4/ipv4.rs:118:9
[INFO] [stdout]     |
[INFO] [stdout] 118 |         eth: &ethernet::Ethernet,
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_eth`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `layer_3_writer`
[INFO] [stdout]   --> src/ipv4/udp/udp.rs:45:59
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn process_packet(frame: ethernet::EthernetFrame, layer_3_writer: &IPstackWriter) {
[INFO] [stdout]    |                                                           ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_layer_3_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `eth`
[INFO] [stdout]    --> src/ipv4/ipv4.rs:118:9
[INFO] [stdout]     |
[INFO] [stdout] 118 |         eth: &ethernet::Ethernet,
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_eth`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `layer_3_writer`
[INFO] [stdout]   --> src/ipv4/udp/udp.rs:45:59
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn process_packet(frame: ethernet::EthernetFrame, layer_3_writer: &IPstackWriter) {
[INFO] [stdout]    |                                                           ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_layer_3_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ipv4/udp/udp.rs:49:18
[INFO] [stdout]    |
[INFO] [stdout] 49 |             Some(mut datagram) => {
[INFO] [stdout]    |                  ----^^^^^^^^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `operation`
[INFO] [stdout]   --> src/arp/arp.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 79 |     fn operation(&self) -> ARPKind {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `handle_packet`
[INFO] [stdout]    --> src/arp/arp.rs:110:8
[INFO] [stdout]     |
[INFO] [stdout] 110 |     fn handle_packet(data: Vec<u8>, eth_addr: [u8; 6]) -> ARP {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `build_request`
[INFO] [stdout]    --> src/arp/arp.rs:115:8
[INFO] [stdout]     |
[INFO] [stdout] 115 |     fn build_request(data: Vec<u8>) -> ARP {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hrd`
[INFO] [stdout]    --> src/arp/arp.rs:175:12
[INFO] [stdout]     |
[INFO] [stdout] 175 |     pub fn hrd(&self) -> [u8; 2] {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pro`
[INFO] [stdout]    --> src/arp/arp.rs:181:12
[INFO] [stdout]     |
[INFO] [stdout] 181 |     pub fn pro(&self) -> [u8; 2] {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `op`
[INFO] [stdout]    --> src/arp/arp.rs:199:12
[INFO] [stdout]     |
[INFO] [stdout] 199 |     pub fn op(&self) -> [u8; 2] {
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tha`
[INFO] [stdout]    --> src/arp/arp.rs:213:12
[INFO] [stdout]     |
[INFO] [stdout] 213 |     pub fn tha(&self) -> &[u8] {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/ethernet/ethernet.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn value(&self) -> u16 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Reading`
[INFO] [stdout]   --> src/ethernet/ethernet.rs:69:5
[INFO] [stdout]    |
[INFO] [stdout] 69 |     Reading,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `build_response_frame`
[INFO] [stdout]   --> src/ethernet/ethernet.rs:95:12
[INFO] [stdout]    |
[INFO] [stdout] 95 |     pub fn build_response_frame<T>(&self, payload: T) -> Self
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `src`
[INFO] [stdout]    --> src/ethernet/ethernet.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |     pub fn src(&self) -> HwAddr {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_socket_state`
[INFO] [stdout]    --> src/ethernet/ethernet.rs:133:8
[INFO] [stdout]     |
[INFO] [stdout] 133 |     fn set_socket_state(&mut self, to_state: State) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ECHO_REQ`
[INFO] [stdout]   --> src/ipv4/icmp/icmp.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | const ECHO_REQ: u8 = 8u8;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `src_str`
[INFO] [stdout]    --> src/ipv4/ipv4.rs:189:12
[INFO] [stdout]     |
[INFO] [stdout] 189 |     pub fn src_str(&self) -> String {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `src_from_bytes`
[INFO] [stdout]    --> src/ipv4/ipv4.rs:254:12
[INFO] [stdout]     |
[INFO] [stdout] 254 |     pub fn src_from_bytes(ip_bytes: &[u8]) -> &[u8] {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `dst_from_bytes`
[INFO] [stdout]    --> src/ipv4/ipv4.rs:258:12
[INFO] [stdout]     |
[INFO] [stdout] 258 |     pub fn dst_from_bytes(ip_bytes: &[u8]) -> &[u8] {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `payload_from_bytes`
[INFO] [stdout]    --> src/ipv4/ipv4.rs:262:12
[INFO] [stdout]     |
[INFO] [stdout] 262 |     pub fn payload_from_bytes(ip_bytes: &[u8]) -> &[u8] {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `dst_port`
[INFO] [stdout]   --> src/ipv4/udp/udp.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn dst_port(&self) -> u16 {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `length`
[INFO] [stdout]   --> src/ipv4/udp/udp.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn length(&self) -> u16 {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `chksm`
[INFO] [stdout]   --> src/ipv4/udp/udp.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn chksm(&self) -> u16 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_chksm`
[INFO] [stdout]   --> src/ipv4/udp/udp.rs:39:12
[INFO] [stdout]    |
[INFO] [stdout] 39 |     pub fn set_chksm(&mut self, value: u16) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `addr_identifier`
[INFO] [stdout]   --> src/ipv4/udp/udp_socket.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     addr_identifier: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/ethernet/ethernet.rs:288:28
[INFO] [stdout]     |
[INFO] [stdout] 288 |                     panic!(err.desc());
[INFO] [stdout]     |                            ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 288 |                     panic!("{}", err.desc());
[INFO] [stdout]     |                            ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 288 |                     std::panic::panic_any(err.desc());
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 27 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/ipv4/udp/udp.rs:49:18
[INFO] [stdout]    |
[INFO] [stdout] 49 |             Some(mut datagram) => {
[INFO] [stdout]    |                  ----^^^^^^^^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `operation`
[INFO] [stdout]   --> src/arp/arp.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 79 |     fn operation(&self) -> ARPKind {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `handle_packet`
[INFO] [stdout]    --> src/arp/arp.rs:110:8
[INFO] [stdout]     |
[INFO] [stdout] 110 |     fn handle_packet(data: Vec<u8>, eth_addr: [u8; 6]) -> ARP {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `build_request`
[INFO] [stdout]    --> src/arp/arp.rs:115:8
[INFO] [stdout]     |
[INFO] [stdout] 115 |     fn build_request(data: Vec<u8>) -> ARP {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hrd`
[INFO] [stdout]    --> src/arp/arp.rs:175:12
[INFO] [stdout]     |
[INFO] [stdout] 175 |     pub fn hrd(&self) -> [u8; 2] {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pro`
[INFO] [stdout]    --> src/arp/arp.rs:181:12
[INFO] [stdout]     |
[INFO] [stdout] 181 |     pub fn pro(&self) -> [u8; 2] {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `op`
[INFO] [stdout]    --> src/arp/arp.rs:199:12
[INFO] [stdout]     |
[INFO] [stdout] 199 |     pub fn op(&self) -> [u8; 2] {
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tha`
[INFO] [stdout]    --> src/arp/arp.rs:213:12
[INFO] [stdout]     |
[INFO] [stdout] 213 |     pub fn tha(&self) -> &[u8] {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/ethernet/ethernet.rs:55:12
[INFO] [stdout]    |
[INFO] [stdout] 55 |     pub fn value(&self) -> u16 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Reading`
[INFO] [stdout]   --> src/ethernet/ethernet.rs:69:5
[INFO] [stdout]    |
[INFO] [stdout] 69 |     Reading,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `build_response_frame`
[INFO] [stdout]   --> src/ethernet/ethernet.rs:95:12
[INFO] [stdout]    |
[INFO] [stdout] 95 |     pub fn build_response_frame<T>(&self, payload: T) -> Self
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `src`
[INFO] [stdout]    --> src/ethernet/ethernet.rs:112:12
[INFO] [stdout]     |
[INFO] [stdout] 112 |     pub fn src(&self) -> HwAddr {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_socket_state`
[INFO] [stdout]    --> src/ethernet/ethernet.rs:133:8
[INFO] [stdout]     |
[INFO] [stdout] 133 |     fn set_socket_state(&mut self, to_state: State) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ECHO_REQ`
[INFO] [stdout]   --> src/ipv4/icmp/icmp.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | const ECHO_REQ: u8 = 8u8;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `src_str`
[INFO] [stdout]    --> src/ipv4/ipv4.rs:189:12
[INFO] [stdout]     |
[INFO] [stdout] 189 |     pub fn src_str(&self) -> String {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `src_from_bytes`
[INFO] [stdout]    --> src/ipv4/ipv4.rs:254:12
[INFO] [stdout]     |
[INFO] [stdout] 254 |     pub fn src_from_bytes(ip_bytes: &[u8]) -> &[u8] {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `dst_from_bytes`
[INFO] [stdout]    --> src/ipv4/ipv4.rs:258:12
[INFO] [stdout]     |
[INFO] [stdout] 258 |     pub fn dst_from_bytes(ip_bytes: &[u8]) -> &[u8] {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `payload_from_bytes`
[INFO] [stdout]    --> src/ipv4/ipv4.rs:262:12
[INFO] [stdout]     |
[INFO] [stdout] 262 |     pub fn payload_from_bytes(ip_bytes: &[u8]) -> &[u8] {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `dst_port`
[INFO] [stdout]   --> src/ipv4/udp/udp.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn dst_port(&self) -> u16 {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `length`
[INFO] [stdout]   --> src/ipv4/udp/udp.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |     pub fn length(&self) -> u16 {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `chksm`
[INFO] [stdout]   --> src/ipv4/udp/udp.rs:35:12
[INFO] [stdout]    |
[INFO] [stdout] 35 |     pub fn chksm(&self) -> u16 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `set_chksm`
[INFO] [stdout]   --> src/ipv4/udp/udp.rs:39:12
[INFO] [stdout]    |
[INFO] [stdout] 39 |     pub fn set_chksm(&mut self, value: u16) {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `addr_identifier`
[INFO] [stdout]   --> src/ipv4/udp/udp_socket.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     addr_identifier: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `htons`
[INFO] [stdout]   --> src/net_util.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn htons(input: &[u8]) -> u16 {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/ethernet/ethernet.rs:288:28
[INFO] [stdout]     |
[INFO] [stdout] 288 |                     panic!(err.desc());
[INFO] [stdout]     |                            ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 288 |                     panic!("{}", err.desc());
[INFO] [stdout]     |                            ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 288 |                     std::panic::panic_any(err.desc());
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 28 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.86s
[INFO] running `Command { std: "docker" "inspect" "b4c5c5f576dba07464ed8d10ca3d8e61a7196eaafb1b4a4c71afdc66c829edaf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4c5c5f576dba07464ed8d10ca3d8e61a7196eaafb1b4a4c71afdc66c829edaf", kill_on_drop: false }`
[INFO] [stdout] b4c5c5f576dba07464ed8d10ca3d8e61a7196eaafb1b4a4c71afdc66c829edaf