[INFO] cloning repository https://github.com/Yorinton/rust-rdbms
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Yorinton/rust-rdbms" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYorinton%2Frust-rdbms", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYorinton%2Frust-rdbms'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5652e528b56f4400ead455a73db73bdf8c08d982
[INFO] checking Yorinton/rust-rdbms against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYorinton%2Frust-rdbms" "/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/Yorinton/rust-rdbms on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Yorinton/rust-rdbms
[INFO] finished tweaking git repo https://github.com/Yorinton/rust-rdbms
[INFO] tweaked toml for git repo https://github.com/Yorinton/rust-rdbms written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/Yorinton/rust-rdbms already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pagecache v0.19.4
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", 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] 804e0ea203050f197ca3b93461c9ec5b5e94b29c0d3ddcb03c57a48d9e782adc
[INFO] running `Command { std: "docker" "start" "-a" "804e0ea203050f197ca3b93461c9ec5b5e94b29c0d3ddcb03c57a48d9e782adc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "804e0ea203050f197ca3b93461c9ec5b5e94b29c0d3ddcb03c57a48d9e782adc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "804e0ea203050f197ca3b93461c9ec5b5e94b29c0d3ddcb03c57a48d9e782adc", kill_on_drop: false }`
[INFO] [stdout] 804e0ea203050f197ca3b93461c9ec5b5e94b29c0d3ddcb03c57a48d9e782adc
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c30b4b93cda588fdcd343fbf25c347c9b9419b9d0ea7aacf9c71d394343b4613
[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" "c30b4b93cda588fdcd343fbf25c347c9b9419b9d0ea7aacf9c71d394343b4613", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.94
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling syn v1.0.71
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling serde_derive v1.0.125
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking nodrop v0.1.14
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking crossbeam-channel v0.3.9
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking parking_lot_core v0.6.2
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking rand_core v0.6.2
[INFO] [stderr]     Checking parking_lot v0.9.0
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking pagecache v0.19.4
[INFO] [stderr]     Checking practice v0.1.0 (/tmp/fixit)
[INFO] [stderr]    Migrating src/lib.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/main_parallel_channel.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/main_parallel.rs from 2018 edition to 2021
[INFO] [stderr]    Migrating src/main_grep.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/main.rs (2 fixes)
[INFO] [stdout] warning: function is never used: `vec_iter`
[INFO] [stdout]  --> src/iter.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn vec_iter() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `vec_iter_next`
[INFO] [stdout]   --> src/iter.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn vec_iter_next() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hash_map_iter`
[INFO] [stdout]   --> src/iter.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn hash_map_iter() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hash_map_iter_mut`
[INFO] [stdout]   --> src/iter.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn hash_map_iter_mut() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_hash_map_by_map`
[INFO] [stdout]   --> src/iter.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub fn create_hash_map_by_map() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `iter_sum`
[INFO] [stdout]   --> src/iter.rs:70:8
[INFO] [stdout]    |
[INFO] [stdout] 70 | pub fn iter_sum() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hash_map_values`
[INFO] [stdout]   --> src/iter.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 79 | pub fn hash_map_values() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `iter_map`
[INFO] [stdout]   --> src/iter.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 99 | pub fn iter_map() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `iter_filter`
[INFO] [stdout]    --> src/iter.rs:110:8
[INFO] [stdout]     |
[INFO] [stdout] 110 | pub fn iter_filter() {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/iter.rs:125:12
[INFO] [stdout]     |
[INFO] [stdout] 125 |     pub fn new(size: u32, style: String) -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/iter.rs:140:12
[INFO] [stdout]     |
[INFO] [stdout] 140 |     pub fn new(shoes: Vec<Shoe>) -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_counted`
[INFO] [stdout]    --> src/iter.rs:148:12
[INFO] [stdout]     |
[INFO] [stdout] 148 |     pub fn get_counted(&self) -> &Vec<Shoe> {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shoes_in_my_size`
[INFO] [stdout]    --> src/iter.rs:169:8
[INFO] [stdout]     |
[INFO] [stdout] 169 | pub fn shoes_in_my_size(shoes: Vec<Shoe>, size: u32) -> Vec<Shoe> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shoe_count`
[INFO] [stdout]    --> src/iter.rs:173:8
[INFO] [stdout]     |
[INFO] [stdout] 173 | pub fn shoe_count(shoe_counter: &mut ShoeCounter) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 47.96s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking practice v0.1.0 (/tmp/fixit)
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Shoe`
[INFO] [stdout]    --> src/main.rs:147:9
[INFO] [stdout]     |
[INFO] [stdout] 147 |         Shoe::new(22, String::from("スニーカー")),
[INFO] [stdout]     |         ^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::iter::Shoe;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Shoe`
[INFO] [stdout]    --> src/main.rs:148:9
[INFO] [stdout]     |
[INFO] [stdout] 148 |         Shoe::new(23, String::from("サンダル")),
[INFO] [stdout]     |         ^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::iter::Shoe;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Shoe`
[INFO] [stdout]    --> src/main.rs:149:9
[INFO] [stdout]     |
[INFO] [stdout] 149 |         Shoe::new(24, String::from("ブーツ")),
[INFO] [stdout]     |         ^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::iter::Shoe;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Shoe`
[INFO] [stdout]    --> src/main.rs:150:9
[INFO] [stdout]     |
[INFO] [stdout] 150 |         Shoe::new(33, String::from("革靴")),
[INFO] [stdout]     |         ^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::iter::Shoe;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Shoe`
[INFO] [stdout]    --> src/main.rs:159:9
[INFO] [stdout]     |
[INFO] [stdout] 159 |         Shoe::new(22, String::from("スニーカー")),
[INFO] [stdout]     |         ^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::iter::Shoe;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Shoe`
[INFO] [stdout]    --> src/main.rs:160:9
[INFO] [stdout]     |
[INFO] [stdout] 160 |         Shoe::new(23, String::from("サンダル")),
[INFO] [stdout]     |         ^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::iter::Shoe;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Shoe`
[INFO] [stdout]    --> src/main.rs:161:9
[INFO] [stdout]     |
[INFO] [stdout] 161 |         Shoe::new(24, String::from("ブーツ")),
[INFO] [stdout]     |         ^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::iter::Shoe;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Shoe`
[INFO] [stdout]    --> src/main.rs:162:9
[INFO] [stdout]     |
[INFO] [stdout] 162 |         Shoe::new(33, String::from("革靴")),
[INFO] [stdout]     |         ^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::iter::Shoe;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `ShoeCounter`
[INFO] [stdout]    --> src/main.rs:164:28
[INFO] [stdout]     |
[INFO] [stdout] 164 |     let mut shoe_counter = ShoeCounter::new(shoes);
[INFO] [stdout]     |                            ^^^^^^^^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout] 1   | use crate::iter::ShoeCounter;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `vec_iter`
[INFO] [stdout]  --> src/iter.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn vec_iter() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `vec_iter_next`
[INFO] [stdout]   --> src/iter.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn vec_iter_next() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hash_map_iter`
[INFO] [stdout]   --> src/iter.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn hash_map_iter() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hash_map_iter_mut`
[INFO] [stdout]   --> src/iter.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn hash_map_iter_mut() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_hash_map_by_map`
[INFO] [stdout]   --> src/iter.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub fn create_hash_map_by_map() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `iter_sum`
[INFO] [stdout]   --> src/iter.rs:70:8
[INFO] [stdout]    |
[INFO] [stdout] 70 | pub fn iter_sum() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hash_map_values`
[INFO] [stdout]   --> src/iter.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 79 | pub fn hash_map_values() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `iter_map`
[INFO] [stdout]   --> src/iter.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 99 | pub fn iter_map() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `iter_filter`
[INFO] [stdout]    --> src/iter.rs:110:8
[INFO] [stdout]     |
[INFO] [stdout] 110 | pub fn iter_filter() {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/iter.rs:125:12
[INFO] [stdout]     |
[INFO] [stdout] 125 |     pub fn new(size: u32, style: String) -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/iter.rs:140:12
[INFO] [stdout]     |
[INFO] [stdout] 140 |     pub fn new(shoes: Vec<Shoe>) -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_counted`
[INFO] [stdout]    --> src/iter.rs:148:12
[INFO] [stdout]     |
[INFO] [stdout] 148 |     pub fn get_counted(&self) -> &Vec<Shoe> {
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shoes_in_my_size`
[INFO] [stdout]    --> src/iter.rs:169:8
[INFO] [stdout]     |
[INFO] [stdout] 169 | pub fn shoes_in_my_size(shoes: Vec<Shoe>, size: u32) -> Vec<Shoe> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shoe_count`
[INFO] [stdout]    --> src/iter.rs:173:8
[INFO] [stdout]     |
[INFO] [stdout] 173 | pub fn shoe_count(shoe_counter: &mut ShoeCounter) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 9 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `practice` due to 10 previous errors
[INFO] [stderr] error: failed to check after updating to 2021
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `cargo check --frozen --all --all-targets --message-format=json` (exit status: 101)
[INFO] running `Command { std: "docker" "inspect" "c30b4b93cda588fdcd343fbf25c347c9b9419b9d0ea7aacf9c71d394343b4613", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c30b4b93cda588fdcd343fbf25c347c9b9419b9d0ea7aacf9c71d394343b4613", kill_on_drop: false }`
[INFO] [stdout] c30b4b93cda588fdcd343fbf25c347c9b9419b9d0ea7aacf9c71d394343b4613