[INFO] cloning repository https://github.com/htoopyaelinn56/rust_practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/htoopyaelinn56/rust_practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhtoopyaelinn56%2Frust_practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhtoopyaelinn56%2Frust_practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] eb9bd52f2c310926e091b30cf3cd0211c769cf30
[INFO] checking htoopyaelinn56/rust_practice against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhtoopyaelinn56%2Frust_practice" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/htoopyaelinn56/rust_practice on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/htoopyaelinn56/rust_practice
[INFO] finished tweaking git repo https://github.com/htoopyaelinn56/rust_practice
[INFO] tweaked toml for git repo https://github.com/htoopyaelinn56/rust_practice written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/htoopyaelinn56/rust_practice 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 763c43a8d49c37be7ac7dbdf876f602268980bd80398d05c7bfbc9e67a6262b6
[INFO] running `Command { std: "docker" "start" "-a" "763c43a8d49c37be7ac7dbdf876f602268980bd80398d05c7bfbc9e67a6262b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "763c43a8d49c37be7ac7dbdf876f602268980bd80398d05c7bfbc9e67a6262b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "763c43a8d49c37be7ac7dbdf876f602268980bd80398d05c7bfbc9e67a6262b6", kill_on_drop: false }`
[INFO] [stdout] 763c43a8d49c37be7ac7dbdf876f602268980bd80398d05c7bfbc9e67a6262b6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] abd2aab3ee75102de569dff4a505352b373c686b4dd8507cbdeafa266a3b72bb
[INFO] running `Command { std: "docker" "start" "-a" "abd2aab3ee75102de569dff4a505352b373c686b4dd8507cbdeafa266a3b72bb", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `rc::Rc`
[INFO] [stdout]  --> src/thread_test.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     rc::Rc,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] help: if this is a test module, consider adding a `#[cfg(test)]` to the containing module
[INFO] [stdout]  --> src/main.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | mod thread_test;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rc::Rc`
[INFO] [stdout]  --> src/thread_test.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     rc::Rc,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]  --> src/get_device_unique_id.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn test() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_test` is never used
[INFO] [stdout]  --> src/thread_test.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn thread_test() {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `move_test` is never used
[INFO] [stdout]   --> src/thread_test.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn move_test() {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `channel_test` is never used
[INFO] [stdout]   --> src/thread_test.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub fn channel_test() {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutliple_message` is never used
[INFO] [stdout]   --> src/thread_test.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn mutliple_message() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutex_single_thread_test` is never used
[INFO] [stdout]   --> src/thread_test.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 91 | pub fn mutex_single_thread_test() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutex_multi_thread_test` is never used
[INFO] [stdout]    --> src/thread_test.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 | pub fn mutex_multi_thread_test() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `modifying_state_concurrently` is never used
[INFO] [stdout]    --> src/thread_test.rs:124:8
[INFO] [stdout]     |
[INFO] [stdout] 124 | pub fn modifying_state_concurrently() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]  --> src/get_device_unique_id.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn test() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_test` is never used
[INFO] [stdout]  --> src/thread_test.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn thread_test() {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `move_test` is never used
[INFO] [stdout]   --> src/thread_test.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn move_test() {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `channel_test` is never used
[INFO] [stdout]   --> src/thread_test.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub fn channel_test() {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutliple_message` is never used
[INFO] [stdout]   --> src/thread_test.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn mutliple_message() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutex_single_thread_test` is never used
[INFO] [stdout]   --> src/thread_test.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 91 | pub fn mutex_single_thread_test() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutex_multi_thread_test` is never used
[INFO] [stdout]    --> src/thread_test.rs:102:8
[INFO] [stdout]     |
[INFO] [stdout] 102 | pub fn mutex_multi_thread_test() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `modifying_state_concurrently` is never used
[INFO] [stdout]    --> src/thread_test.rs:124:8
[INFO] [stdout]     |
[INFO] [stdout] 124 | pub fn modifying_state_concurrently() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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` profile [unoptimized + debuginfo] target(s) in 6.72s
[INFO] running `Command { std: "docker" "inspect" "abd2aab3ee75102de569dff4a505352b373c686b4dd8507cbdeafa266a3b72bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "abd2aab3ee75102de569dff4a505352b373c686b4dd8507cbdeafa266a3b72bb", kill_on_drop: false }`
[INFO] [stdout] abd2aab3ee75102de569dff4a505352b373c686b4dd8507cbdeafa266a3b72bb