[INFO] cloning repository https://github.com/iceymoss/learn-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iceymoss/learn-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ficeymoss%2Flearn-rust", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 93951276f9d5cc9129e7d0cc2e454eeb35ba9a73
[INFO] checking iceymoss/learn-rust against master#df1ae0f7dd168513de2d89beb2cb7a95d4fdc118 for pr-159343
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ficeymoss%2Flearn-rust" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/iceymoss/learn-rust
[INFO] finished tweaking git repo https://github.com/iceymoss/learn-rust
[INFO] tweaked toml for git repo https://github.com/iceymoss/learn-rust written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/iceymoss/learn-rust on toolchain df1ae0f7dd168513de2d89beb2cb7a95d4fdc118
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[INFO] crate git repo https://github.com/iceymoss/learn-rust 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" "+df1ae0f7dd168513de2d89beb2cb7a95d4fdc118" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3d5ced03c013a94a2f102a4510f48a6e9184255caf5fd8244f58017bde7f5210" "sleep" "infinity", kill_on_drop: false }`
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[INFO] [stdout] warning: unused import: `command`
[INFO] [stdout]  --> src/cli/mod.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | use clap::{command, Parser, Subcommand};
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `command`
[INFO] [stdout]  --> src/cli/mod.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | use clap::{command, Parser, Subcommand};
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::task::futures`
[INFO] [stdout]  --> src/channel/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use tokio::task::futures;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::task::futures`
[INFO] [stdout]  --> src/channel/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use tokio::task::futures;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `sqrt`
[INFO] [stdout]  --> src/operations/mod.rs:5:20
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use advanced::{sqrt};
[INFO] [stdout]   |                    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/async/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     write().await;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let _ = write().await;
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/async/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     read().await;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let _ = read().await;
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `sqrt`
[INFO] [stdout]  --> src/operations/mod.rs:5:20
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub use advanced::{sqrt};
[INFO] [stdout]   |                    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arc_data`
[INFO] [stdout]   --> src/mutex/main.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let arc_data = Arc::new(atomic_forty_two);
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_arc_data`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sqrt` is never used
[INFO] [stdout]  --> src/operations/advanced.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn sqrt(x: f64) -> Result<f64, CalculatorError> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `NegativeRoot` and `InvalidInput` are never constructed
[INFO] [stdout]  --> src/error.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub enum CalculatorError {
[INFO] [stdout]   |          --------------- variants in this enum
[INFO] [stdout] 3 |     DivisionByZero,
[INFO] [stdout] 4 |     NegativeRoot,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 5 |     InvalidInput,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `CalculatorError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `write` is never used
[INFO] [stdout]  --> src/file/write.rs:4:14
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub async fn write() -> std::io::Result<()> {
[INFO] [stdout]   |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/async/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     write().await;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]   = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let _ = write().await;
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read` is never used
[INFO] [stdout]  --> src/file/read.rs:4:14
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub async fn read() -> std::io::Result<()> {
[INFO] [stdout]   |              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/async/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     read().await;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let _ = read().await;
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused implementer of `Future` that must be used
[INFO] [stdout]   --> src/mutex/main.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     mutex_test();
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arc_data`
[INFO] [stdout]   --> src/mutex/main.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let arc_data = Arc::new(atomic_forty_two);
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_arc_data`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sqrt` is never used
[INFO] [stdout]  --> src/operations/advanced.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn sqrt(x: f64) -> Result<f64, CalculatorError> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `NegativeRoot` and `InvalidInput` are never constructed
[INFO] [stdout]  --> src/error.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub enum CalculatorError {
[INFO] [stdout]   |          --------------- variants in this enum
[INFO] [stdout] 3 |     DivisionByZero,
[INFO] [stdout] 4 |     NegativeRoot,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 5 |     InvalidInput,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `CalculatorError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `write` is never used
[INFO] [stdout]  --> src/file/write.rs:4:14
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub async fn write() -> std::io::Result<()> {
[INFO] [stdout]   |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read` is never used
[INFO] [stdout]  --> src/file/read.rs:4:14
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub async fn read() -> std::io::Result<()> {
[INFO] [stdout]   |              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused implementer of `Future` that must be used
[INFO] [stdout]   --> src/mutex/main.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     mutex_test();
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 52s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: num-bigint-dig v0.8.4, proc-macro-error2 v2.0.1
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "e8e6ee5e5514cd20ad4a74d0c51fffafb5996598fda254e5e31f25d429c4da0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e8e6ee5e5514cd20ad4a74d0c51fffafb5996598fda254e5e31f25d429c4da0b", kill_on_drop: false }`
[INFO] [stdout] e8e6ee5e5514cd20ad4a74d0c51fffafb5996598fda254e5e31f25d429c4da0b
