[INFO] cloning repository https://github.com/Anecoz/falafel
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Anecoz/falafel" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAnecoz%2Ffalafel", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAnecoz%2Ffalafel'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 856b17895f5e44ab7fa35bc4bf6229e9c000adc7
[INFO] checking Anecoz/falafel against master#a5f164faad4a2fed606b8160fd7ecd2d5cbba381 for pr-84920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAnecoz%2Ffalafel" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Anecoz/falafel on toolchain a5f164faad4a2fed606b8160fd7ecd2d5cbba381
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Anecoz/falafel
[INFO] finished tweaking git repo https://github.com/Anecoz/falafel
[INFO] tweaked toml for git repo https://github.com/Anecoz/falafel written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/Anecoz/falafel already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0a0537c3746d9157d01fc94dd38a17e36be84029103b3923a1ea10bcc57b56f4
[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" "0a0537c3746d9157d01fc94dd38a17e36be84029103b3923a1ea10bcc57b56f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0a0537c3746d9157d01fc94dd38a17e36be84029103b3923a1ea10bcc57b56f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a0537c3746d9157d01fc94dd38a17e36be84029103b3923a1ea10bcc57b56f4", kill_on_drop: false }`
[INFO] [stdout] 0a0537c3746d9157d01fc94dd38a17e36be84029103b3923a1ea10bcc57b56f4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+a5f164faad4a2fed606b8160fd7ecd2d5cbba381" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 910ec4e7e046c4e34ed597aa91e4ab495ba8eeba6307a2cc3ab3f43c5971fede
[INFO] running `Command { std: "docker" "start" "-a" "910ec4e7e046c4e34ed597aa91e4ab495ba8eeba6307a2cc3ab3f43c5971fede", kill_on_drop: false }`
[INFO] [stderr]     Checking falafel v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: constant is never used: `HEADER_SIZE`
[INFO] [stdout]  --> src/common.rs:2:3
[INFO] [stdout]   |
[INFO] [stdout] 2 |   pub const HEADER_SIZE: u32 = 2; // 1 byte for type, 1 byte for size of packet
[INFO] [stdout]   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `PacketHeader`
[INFO] [stdout]  --> src/common.rs:9:14
[INFO] [stdout]   |
[INFO] [stdout] 9 |   pub struct PacketHeader {
[INFO] [stdout]   |              ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `deserialize_header`
[INFO] [stdout]   --> src/common.rs:33:10
[INFO] [stdout]    |
[INFO] [stdout] 33 |   pub fn deserialize_header(header_bytes: Vec<u8>) -> PacketHeader {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `deserialize`
[INFO] [stdout]   --> src/common.rs:40:10
[INFO] [stdout]    |
[INFO] [stdout] 40 |   pub fn deserialize(header: PacketHeader, content_bytes: Vec<u8>) -> PacketType {
[INFO] [stdout]    |          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `serialize`
[INFO] [stdout]   --> src/common.rs:14:10
[INFO] [stdout]    |
[INFO] [stdout] 14 |   pub fn serialize(packet: PacketType) -> Vec<u8> {
[INFO] [stdout]    |          ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/server.rs:65:26
[INFO] [stdout]    |
[INFO] [stdout] 65 |     Err(error) => panic!(error),
[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] 65 |     Err(error) => panic!("{}", error),
[INFO] [stdout]    |                          ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 65 |     Err(error) => std::panic::panic_any(error),
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `serialize`
[INFO] [stdout]   --> src/common.rs:14:10
[INFO] [stdout]    |
[INFO] [stdout] 14 |   pub fn serialize(packet: PacketType) -> Vec<u8> {
[INFO] [stdout]    |          ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/server.rs:65:26
[INFO] [stdout]    |
[INFO] [stdout] 65 |     Err(error) => panic!(error),
[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] 65 |     Err(error) => panic!("{}", error),
[INFO] [stdout]    |                          ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 65 |     Err(error) => std::panic::panic_any(error),
[INFO] [stdout]    |                   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `HEADER_SIZE`
[INFO] [stdout]  --> src/common.rs:2:3
[INFO] [stdout]   |
[INFO] [stdout] 2 |   pub const HEADER_SIZE: u32 = 2; // 1 byte for type, 1 byte for size of packet
[INFO] [stdout]   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `PacketHeader`
[INFO] [stdout]  --> src/common.rs:9:14
[INFO] [stdout]   |
[INFO] [stdout] 9 |   pub struct PacketHeader {
[INFO] [stdout]   |              ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `deserialize_header`
[INFO] [stdout]   --> src/common.rs:33:10
[INFO] [stdout]    |
[INFO] [stdout] 33 |   pub fn deserialize_header(header_bytes: Vec<u8>) -> PacketHeader {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `deserialize`
[INFO] [stdout]   --> src/common.rs:40:10
[INFO] [stdout]    |
[INFO] [stdout] 40 |   pub fn deserialize(header: PacketHeader, content_bytes: Vec<u8>) -> PacketType {
[INFO] [stdout]    |          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/client.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     std::io::stdout().flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/client.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     writer.write(&serialized[..]);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/client.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     std::io::stdout().flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/client.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 |     writer.write(&serialized[..]);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.79s
[INFO] running `Command { std: "docker" "inspect" "910ec4e7e046c4e34ed597aa91e4ab495ba8eeba6307a2cc3ab3f43c5971fede", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "910ec4e7e046c4e34ed597aa91e4ab495ba8eeba6307a2cc3ab3f43c5971fede", kill_on_drop: false }`
[INFO] [stdout] 910ec4e7e046c4e34ed597aa91e4ab495ba8eeba6307a2cc3ab3f43c5971fede