[INFO] cloning repository https://github.com/lbt05/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lbt05/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flbt05%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flbt05%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a08295079cdc40ec489157aa8c87c5ef30765b43
[INFO] checking lbt05/rust-playground against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flbt05%2Frust-playground" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lbt05/rust-playground 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/lbt05/rust-playground
[INFO] finished tweaking git repo https://github.com/lbt05/rust-playground
[INFO] tweaked toml for git repo https://github.com/lbt05/rust-playground written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/lbt05/rust-playground 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 zip v0.5.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] [stdout] a11997c3b05b3d839266c9305ad70bfece7d71b475f303bcff79e80fcfcdeced
[INFO] running `Command { std: "docker" "start" "-a" "a11997c3b05b3d839266c9305ad70bfece7d71b475f303bcff79e80fcfcdeced", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a11997c3b05b3d839266c9305ad70bfece7d71b475f303bcff79e80fcfcdeced", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a11997c3b05b3d839266c9305ad70bfece7d71b475f303bcff79e80fcfcdeced", kill_on_drop: false }`
[INFO] [stdout] a11997c3b05b3d839266c9305ad70bfece7d71b475f303bcff79e80fcfcdeced
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] c3614fde531862b9502b18e9fa896fb6999809d180b48b33ae0258c2060404eb
[INFO] running `Command { std: "docker" "start" "-a" "c3614fde531862b9502b18e9fa896fb6999809d180b48b33ae0258c2060404eb", 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 v0.2.66
[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]     Checking adler32 v1.0.4
[INFO] [stderr]     Checking podio v0.1.6
[INFO] [stderr]     Checking miniz_oxide v0.3.6
[INFO] [stderr]     Checking flate2 v1.0.13
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]    Compiling bzip2-sys v0.1.7
[INFO] [stderr]     Checking bzip2 v0.3.3
[INFO] [stderr]     Checking zip v0.5.4
[INFO] [stderr]     Checking rust-playground v0.1.0 (/tmp/fixit)
[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[INFO] [stderr]        Fixed src/main.rs (1 fix)
[INFO] [stderr]        Fixed src/file/zip_file.rs (1 fix)
[INFO] [stdout] warning: function is never used: `simple_thread`
[INFO] [stdout]  --> src/concurrency/play_concurrency.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn simple_thread() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `simple_thread`
[INFO] [stdout]  --> src/concurrency/play_concurrency.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn simple_thread() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_await_example`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn thread_await_example() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_await_example`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn thread_await_example() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_move`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn thread_with_move() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_move`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn thread_with_move() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_channel`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn thread_with_channel() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_channel`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn thread_with_channel() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `multi_thread_with_channel`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub fn multi_thread_with_channel() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `multi_thread_with_channel`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub fn multi_thread_with_channel() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_arc`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 99 | pub fn thread_with_arc() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_arc`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 99 | pub fn thread_with_arc() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_arc_share`
[INFO] [stdout]    --> src/concurrency/play_concurrency.rs:120:8
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn thread_with_arc_share() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_arc_share`
[INFO] [stdout]    --> src/concurrency/play_concurrency.rs:120:8
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn thread_with_arc_share() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculation_method`
[INFO] [stdout]    --> src/concurrency/play_concurrency.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn calculation_method(key: i32, data: Arc<RwLock<HashMap<i32, i32, RandomState>>>, thread_tx: Sender<i32>) -> () {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculation_method`
[INFO] [stdout]    --> src/concurrency/play_concurrency.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn calculation_method(key: i32, data: Arc<RwLock<HashMap<i32, i32, RandomState>>>, thread_tx: Sender<i32>) -> () {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/file/zip_file.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         file.read_to_string(&mut buffer);
[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/file/zip_file.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         file.read_to_string(&mut buffer);
[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: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.46s
[INFO] [stderr] Running `cargo check` to verify 2021
[INFO] [stderr]     Checking rust-playground v0.1.0 (/tmp/fixit)
[INFO] [stdout] warning: function is never used: `simple_thread`
[INFO] [stdout]  --> src/concurrency/play_concurrency.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn simple_thread() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_await_example`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn thread_await_example() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_move`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn thread_with_move() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_channel`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn thread_with_channel() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `multi_thread_with_channel`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub fn multi_thread_with_channel() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_arc`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 99 | pub fn thread_with_arc() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_arc_share`
[INFO] [stdout]    --> src/concurrency/play_concurrency.rs:120:8
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn thread_with_arc_share() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculation_method`
[INFO] [stdout]    --> src/concurrency/play_concurrency.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn calculation_method(key: i32, data: Arc<RwLock<HashMap<i32, i32, RandomState>>>, thread_tx: Sender<i32>) -> () {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/file/zip_file.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         file.read_to_string(&mut buffer);
[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: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `simple_thread`
[INFO] [stdout]  --> src/concurrency/play_concurrency.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn simple_thread() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_await_example`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn thread_await_example() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_move`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn thread_with_move() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_channel`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 47 | pub fn thread_with_channel() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `multi_thread_with_channel`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub fn multi_thread_with_channel() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_arc`
[INFO] [stdout]   --> src/concurrency/play_concurrency.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 99 | pub fn thread_with_arc() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `thread_with_arc_share`
[INFO] [stdout]    --> src/concurrency/play_concurrency.rs:120:8
[INFO] [stdout]     |
[INFO] [stdout] 120 | pub fn thread_with_arc_share() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculation_method`
[INFO] [stdout]    --> src/concurrency/play_concurrency.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn calculation_method(key: i32, data: Arc<RwLock<HashMap<i32, i32, RandomState>>>, thread_tx: Sender<i32>) -> () {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/file/zip_file.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         file.read_to_string(&mut buffer);
[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: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.42s
[INFO] running `Command { std: "docker" "inspect" "c3614fde531862b9502b18e9fa896fb6999809d180b48b33ae0258c2060404eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3614fde531862b9502b18e9fa896fb6999809d180b48b33ae0258c2060404eb", kill_on_drop: false }`
[INFO] [stdout] c3614fde531862b9502b18e9fa896fb6999809d180b48b33ae0258c2060404eb