[INFO] cloning repository https://github.com/IreneKnapp/2021-advent-of-code
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/IreneKnapp/2021-advent-of-code" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIreneKnapp%2F2021-advent-of-code", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIreneKnapp%2F2021-advent-of-code'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8d63b78e7031ea442404c0cb4ecf0e5c93972eeb
[INFO] building IreneKnapp/2021-advent-of-code against master#c7f6aa2869acdbf014d094c6e427e554e160b6db for pr-146237-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIreneKnapp%2F2021-advent-of-code" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/IreneKnapp/2021-advent-of-code
[INFO] finished tweaking git repo https://github.com/IreneKnapp/2021-advent-of-code
[INFO] tweaked toml for git repo https://github.com/IreneKnapp/2021-advent-of-code written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/IreneKnapp/2021-advent-of-code on toolchain c7f6aa2869acdbf014d094c6e427e554e160b6db
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/IreneKnapp/2021-advent-of-code already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded termtree v0.2.3
[INFO] [stderr]   Downloaded proc-macro2 v1.0.32
[INFO] [stderr]   Downloaded predicates-tree v1.0.4
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[INFO] [stderr]   Downloaded pico-args v0.4.2
[INFO] [stderr]   Downloaded indexmap v1.7.0
[INFO] [stderr]   Downloaded smallvec v1.7.0
[INFO] [stderr]   Downloaded ryu v1.0.6
[INFO] [stderr]   Downloaded siphasher v0.3.7
[INFO] [stderr]   Downloaded serde_json v1.0.72
[INFO] [stderr]   Downloaded string_cache v0.8.2
[INFO] [stderr]   Downloaded syn v1.0.82
[INFO] [stderr]   Downloaded lalrpop v0.19.6
[INFO] [stderr]   Downloaded redox_users v0.4.0
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[INFO] [stderr]   Downloaded rustversion v1.0.5
[INFO] [stderr]   Downloaded lalrpop-util v0.19.6
[INFO] [stderr]   Downloaded quote v1.0.10
[INFO] [stderr]   Downloaded ena v0.14.0
[INFO] [stderr]   Downloaded escargot v0.3.1
[INFO] [stderr]   Downloaded predicates-core v1.0.2
[INFO] [stderr]   Downloaded libc v0.2.108
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 90fd16a38ff126db7deb875f97ee5eb27623c241122dbe22a5f369bf8fb735d8
[INFO] running `Command { std: "docker" "start" "-a" "90fd16a38ff126db7deb875f97ee5eb27623c241122dbe22a5f369bf8fb735d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "90fd16a38ff126db7deb875f97ee5eb27623c241122dbe22a5f369bf8fb735d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90fd16a38ff126db7deb875f97ee5eb27623c241122dbe22a5f369bf8fb735d8", kill_on_drop: false }`
[INFO] [stdout] 90fd16a38ff126db7deb875f97ee5eb27623c241122dbe22a5f369bf8fb735d8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 972ac0884a42f24e0b247e4af3be6c87f66ba0af47946eb3da73e13907e33a4d
[INFO] running `Command { std: "docker" "start" "-a" "972ac0884a42f24e0b247e4af3be6c87f66ba0af47946eb3da73e13907e33a4d", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling smallvec v1.7.0
[INFO] [stderr]    Compiling siphasher v0.3.7
[INFO] [stderr]    Compiling tiny-keccak v2.0.2
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling fixedbitset v0.2.0
[INFO] [stderr]    Compiling new_debug_unreachable v1.0.4
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling instant v0.1.12
[INFO] [stderr]    Compiling lock_api v0.4.5
[INFO] [stderr]    Compiling precomputed-hash v0.1.1
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling pico-args v0.4.2
[INFO] [stderr]    Compiling phf_shared v0.8.0
[INFO] [stderr]    Compiling diff v0.1.12
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling bit-set v0.5.2
[INFO] [stderr]    Compiling itertools v0.10.1
[INFO] [stderr]    Compiling ena v0.14.0
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]    Compiling dirs-sys-next v0.1.2
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling dirs-next v2.0.0
[INFO] [stderr]    Compiling petgraph v0.5.1
[INFO] [stderr]    Compiling term v0.7.0
[INFO] [stderr]    Compiling parking_lot v0.11.2
[INFO] [stderr]    Compiling ascii-canvas v3.0.0
[INFO] [stderr]    Compiling string_cache v0.8.2
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling lalrpop-util v0.19.6
[INFO] [stderr]    Compiling advent_lib v0.1.0 (/opt/rustwide/workdir/lib)
[INFO] [stderr]    Compiling lalrpop v0.19.6
[INFO] [stderr]    Compiling advent_12 v0.1.0 (/opt/rustwide/workdir/12)
[INFO] [stderr]    Compiling advent_08 v0.1.0 (/opt/rustwide/workdir/08)
[INFO] [stderr]    Compiling advent_14 v0.1.0 (/opt/rustwide/workdir/14)
[INFO] [stderr]    Compiling advent_19 v0.1.0 (/opt/rustwide/workdir/19)
[INFO] [stderr]    Compiling advent_22 v0.1.0 (/opt/rustwide/workdir/22)
[INFO] [stderr]    Compiling advent_17 v0.1.0 (/opt/rustwide/workdir/17)
[INFO] [stderr]    Compiling advent_06 v0.1.0 (/opt/rustwide/workdir/06)
[INFO] [stderr]    Compiling advent_24 v0.1.0 (/opt/rustwide/workdir/24)
[INFO] [stderr]    Compiling advent_01 v0.1.0 (/opt/rustwide/workdir/01)
[INFO] [stderr]    Compiling advent_25 v0.1.0 (/opt/rustwide/workdir/25)
[INFO] [stderr]    Compiling advent_10 v0.1.0 (/opt/rustwide/workdir/10)
[INFO] [stderr]    Compiling advent_20 v0.1.0 (/opt/rustwide/workdir/20)
[INFO] [stderr]    Compiling advent_13 v0.1.0 (/opt/rustwide/workdir/13)
[INFO] [stderr]    Compiling advent_03 v0.1.0 (/opt/rustwide/workdir/03)
[INFO] [stderr]    Compiling advent_07 v0.1.0 (/opt/rustwide/workdir/07)
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&char` instead of cloning the inner type
[INFO] [stdout]    --> 08/src/main.rs:185:60
[INFO] [stdout]     |
[INFO] [stdout] 185 |     let encoded_e: char = *encoded_e.iter().next().unwrap().clone();
[INFO] [stdout]     |                                                            ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling advent_09 v0.1.0 (/opt/rustwide/workdir/09)
[INFO] [stderr]    Compiling advent_21 v0.1.0 (/opt/rustwide/workdir/21)
[INFO] [stderr]    Compiling advent_15 v0.1.0 (/opt/rustwide/workdir/15)
[INFO] [stderr]    Compiling advent_04 v0.1.0 (/opt/rustwide/workdir/04)
[INFO] [stderr]    Compiling advent_05 v0.1.0 (/opt/rustwide/workdir/05)
[INFO] [stderr]    Compiling advent_02 v0.1.0 (/opt/rustwide/workdir/02)
[INFO] [stderr]    Compiling advent_11 v0.1.0 (/opt/rustwide/workdir/11)
[INFO] [stderr]    Compiling advent_23 v0.1.0 (/opt/rustwide/workdir/23)
[INFO] [stderr]    Compiling advent_16 v0.1.0 (/opt/rustwide/workdir/16)
[INFO] [stdout] warning: fields `version`, `type_id`, `content`, and `subpackets` are never read
[INFO] [stdout]  --> 16/src/main.rs:5:3
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Packet {
[INFO] [stdout]   |        ------ fields in this struct
[INFO] [stdout] 5 |   version: u8,
[INFO] [stdout]   |   ^^^^^^^
[INFO] [stdout] 6 |   type_id: u8,
[INFO] [stdout]   |   ^^^^^^^
[INFO] [stdout] 7 |   content: Vec<u8>,
[INFO] [stdout]   |   ^^^^^^^
[INFO] [stdout] 8 |   subpackets: Vec<Packet>,
[INFO] [stdout]   |   ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Packet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling advent_18 v0.1.0 (/opt/rustwide/workdir/18)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 23.34s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: lalrpop v0.19.6
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "972ac0884a42f24e0b247e4af3be6c87f66ba0af47946eb3da73e13907e33a4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "972ac0884a42f24e0b247e4af3be6c87f66ba0af47946eb3da73e13907e33a4d", kill_on_drop: false }`
[INFO] [stdout] 972ac0884a42f24e0b247e4af3be6c87f66ba0af47946eb3da73e13907e33a4d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3a2f4fcdd6469fe4a23eb97395d45c1a7ae3c35d243f8bf3bd5e9596b002d4cb
[INFO] running `Command { std: "docker" "start" "-a" "3a2f4fcdd6469fe4a23eb97395d45c1a7ae3c35d243f8bf3bd5e9596b002d4cb", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling ryu v1.0.6
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling serde_json v1.0.72
[INFO] [stderr]    Compiling escargot v0.3.1
[INFO] [stderr]    Compiling predicates-core v1.0.2
[INFO] [stderr]    Compiling itoa v0.4.8
[INFO] [stderr]    Compiling difference v2.0.0
[INFO] [stderr]    Compiling termtree v0.2.3
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]    Compiling instant v0.1.12
[INFO] [stderr]    Compiling smallvec v1.7.0
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling lock_api v0.4.5
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling siphasher v0.3.7
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling predicates v1.0.8
[INFO] [stderr]    Compiling tiny-keccak v2.0.2
[INFO] [stderr]    Compiling phf_shared v0.8.0
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling new_debug_unreachable v1.0.4
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling fixedbitset v0.2.0
[INFO] [stderr]    Compiling predicates-tree v1.0.4
[INFO] [stderr]    Compiling bit-set v0.5.2
[INFO] [stderr]    Compiling ena v0.14.0
[INFO] [stderr]    Compiling diff v0.1.12
[INFO] [stderr]    Compiling pico-args v0.4.2
[INFO] [stderr]    Compiling advent_lib v0.1.0 (/opt/rustwide/workdir/lib)
[INFO] [stdout] warning: fields `version`, `type_id`, `content`, and `subpackets` are never read
[INFO] [stdout]  --> 16/src/main.rs:5:3
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Packet {
[INFO] [stdout]   |        ------ fields in this struct
[INFO] [stdout] 5 |   version: u8,
[INFO] [stdout]   |   ^^^^^^^
[INFO] [stdout] 6 |   type_id: u8,
[INFO] [stdout]   |   ^^^^^^^
[INFO] [stdout] 7 |   content: Vec<u8>,
[INFO] [stdout]   |   ^^^^^^^
[INFO] [stdout] 8 |   subpackets: Vec<Packet>,
[INFO] [stdout]   |   ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Packet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&char` instead of cloning the inner type
[INFO] [stdout]    --> 08/src/main.rs:185:60
[INFO] [stdout]     |
[INFO] [stdout] 185 |     let encoded_e: char = *encoded_e.iter().next().unwrap().clone();
[INFO] [stdout]     |                                                            ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling itertools v0.10.1
[INFO] [stderr]    Compiling dirs-sys-next v0.1.2
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling parking_lot v0.11.2
[INFO] [stderr]    Compiling dirs-next v2.0.0
[INFO] [stderr]    Compiling term v0.7.0
[INFO] [stderr]    Compiling petgraph v0.5.1
[INFO] [stderr]    Compiling string_cache v0.8.2
[INFO] [stderr]    Compiling ascii-canvas v3.0.0
[INFO] [stderr]    Compiling lalrpop v0.19.6
[INFO] [stderr]    Compiling assert_cmd v0.10.2
[INFO] [stderr]    Compiling advent_20 v0.1.0 (/opt/rustwide/workdir/20)
[INFO] [stderr]    Compiling advent_16 v0.1.0 (/opt/rustwide/workdir/16)
[INFO] [stderr]    Compiling advent_22 v0.1.0 (/opt/rustwide/workdir/22)
[INFO] [stderr]    Compiling advent_08 v0.1.0 (/opt/rustwide/workdir/08)
[INFO] [stderr]    Compiling advent_17 v0.1.0 (/opt/rustwide/workdir/17)
[INFO] [stderr]    Compiling advent_09 v0.1.0 (/opt/rustwide/workdir/09)
[INFO] [stderr]    Compiling advent_11 v0.1.0 (/opt/rustwide/workdir/11)
[INFO] [stderr]    Compiling advent_01 v0.1.0 (/opt/rustwide/workdir/01)
[INFO] [stderr]    Compiling advent_13 v0.1.0 (/opt/rustwide/workdir/13)
[INFO] [stderr]    Compiling advent_06 v0.1.0 (/opt/rustwide/workdir/06)
[INFO] [stderr]    Compiling advent_07 v0.1.0 (/opt/rustwide/workdir/07)
[INFO] [stderr]    Compiling advent_03 v0.1.0 (/opt/rustwide/workdir/03)
[INFO] [stderr]    Compiling advent_05 v0.1.0 (/opt/rustwide/workdir/05)
[INFO] [stderr]    Compiling advent_14 v0.1.0 (/opt/rustwide/workdir/14)
[INFO] [stderr]    Compiling advent_24 v0.1.0 (/opt/rustwide/workdir/24)
[INFO] [stderr]    Compiling advent_19 v0.1.0 (/opt/rustwide/workdir/19)
[INFO] [stderr]    Compiling advent_25 v0.1.0 (/opt/rustwide/workdir/25)
[INFO] [stderr]    Compiling advent_23 v0.1.0 (/opt/rustwide/workdir/23)
[INFO] [stderr]    Compiling advent_15 v0.1.0 (/opt/rustwide/workdir/15)
[INFO] [stderr]    Compiling advent_02 v0.1.0 (/opt/rustwide/workdir/02)
[INFO] [stderr]    Compiling advent_21 v0.1.0 (/opt/rustwide/workdir/21)
[INFO] [stderr]    Compiling advent_10 v0.1.0 (/opt/rustwide/workdir/10)
[INFO] [stdout] warning: fields `version`, `type_id`, `content`, and `subpackets` are never read
[INFO] [stdout]  --> 16/src/main.rs:5:3
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Packet {
[INFO] [stdout]   |        ------ fields in this struct
[INFO] [stdout] 5 |   version: u8,
[INFO] [stdout]   |   ^^^^^^^
[INFO] [stdout] 6 |   type_id: u8,
[INFO] [stdout]   |   ^^^^^^^
[INFO] [stdout] 7 |   content: Vec<u8>,
[INFO] [stdout]   |   ^^^^^^^
[INFO] [stdout] 8 |   subpackets: Vec<Packet>,
[INFO] [stdout]   |   ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Packet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling advent_04 v0.1.0 (/opt/rustwide/workdir/04)
[INFO] [stderr]    Compiling advent_12 v0.1.0 (/opt/rustwide/workdir/12)
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&char` instead of cloning the inner type
[INFO] [stdout]    --> 08/src/main.rs:185:60
[INFO] [stdout]     |
[INFO] [stdout] 185 |     let encoded_e: char = *encoded_e.iter().next().unwrap().clone();
[INFO] [stdout]     |                                                            ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling advent_18 v0.1.0 (/opt/rustwide/workdir/18)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 27.49s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: lalrpop v0.19.6
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "3a2f4fcdd6469fe4a23eb97395d45c1a7ae3c35d243f8bf3bd5e9596b002d4cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a2f4fcdd6469fe4a23eb97395d45c1a7ae3c35d243f8bf3bd5e9596b002d4cb", kill_on_drop: false }`
[INFO] [stdout] 3a2f4fcdd6469fe4a23eb97395d45c1a7ae3c35d243f8bf3bd5e9596b002d4cb
