[INFO] cloning repository https://github.com/mjpc13/hanoi_tower
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mjpc13/hanoi_tower" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmjpc13%2Fhanoi_tower", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmjpc13%2Fhanoi_tower'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 35fc8c36ca19da9ec65a1c099c06d1ab9f99bef3
[INFO] checking mjpc13/hanoi_tower against try#73ffebff6f34db7eb167bf9edcf2afa19c3073e9 for pr-147841
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmjpc13%2Fhanoi_tower" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/mjpc13/hanoi_tower
[INFO] finished tweaking git repo https://github.com/mjpc13/hanoi_tower
[INFO] tweaked toml for git repo https://github.com/mjpc13/hanoi_tower written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/mjpc13/hanoi_tower on toolchain 73ffebff6f34db7eb167bf9edcf2afa19c3073e9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+73ffebff6f34db7eb167bf9edcf2afa19c3073e9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/mjpc13/hanoi_tower 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" "+73ffebff6f34db7eb167bf9edcf2afa19c3073e9" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "+73ffebff6f34db7eb167bf9edcf2afa19c3073e9" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0a267f0ec491fdb572a942f686d34d2c07fa31a7aa5af7841c5b5e7b64f79261
[INFO] running `Command { std: "docker" "start" "-a" "0a267f0ec491fdb572a942f686d34d2c07fa31a7aa5af7841c5b5e7b64f79261", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0a267f0ec491fdb572a942f686d34d2c07fa31a7aa5af7841c5b5e7b64f79261", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a267f0ec491fdb572a942f686d34d2c07fa31a7aa5af7841c5b5e7b64f79261", kill_on_drop: false }`
[INFO] [stdout] 0a267f0ec491fdb572a942f686d34d2c07fa31a7aa5af7841c5b5e7b64f79261
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "+73ffebff6f34db7eb167bf9edcf2afa19c3073e9" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 582e9652cfd81f6188ceab0d941ad8334c7ee256bf4eab805b3d08959e4023c5
[INFO] running `Command { std: "docker" "start" "-a" "582e9652cfd81f6188ceab0d941ad8334c7ee256bf4eab805b3d08959e4023c5", kill_on_drop: false }`
[INFO] [stderr]     Checking hanoi_tower v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::env`
[INFO] [stdout]  --> src/lib.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::env;
[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: `std::env`
[INFO] [stdout]  --> src/lib.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::env;
[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: `std::iter`
[INFO] [stdout]  --> src/engine.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::iter;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::iter`
[INFO] [stdout]  --> src/engine.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::iter;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/engine.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/engine.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/engine.rs:67:13
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let mut s1 = Stack::new(n_disks, true);
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/engine.rs:68:13
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let mut s2 = Stack::new(n_disks, false);
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/engine.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |         let mut s3 = Stack::new(n_disks, false);
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/engine.rs:70:13
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let mut stacks = [s1,s2,s3];
[INFO] [stdout]    |             ----^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/engine.rs:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |         let mut string: String = String::new();
[INFO] [stdout]    |             ----^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/engine.rs:67:13
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let mut s1 = Stack::new(n_disks, true);
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/engine.rs:68:13
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let mut s2 = Stack::new(n_disks, false);
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/engine.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |         let mut s3 = Stack::new(n_disks, false);
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/engine.rs:70:13
[INFO] [stdout]    |
[INFO] [stdout] 70 |         let mut stacks = [s1,s2,s3];
[INFO] [stdout]    |             ----^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/engine.rs:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |         let mut string: String = String::new();
[INFO] [stdout]    |             ----^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `error`
[INFO] [stdout]   --> src/lib.rs:23:17
[INFO] [stdout]    |
[INFO] [stdout] 23 |             Err(error) => Err("Error parsing the input"),
[INFO] [stdout]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `error`
[INFO] [stdout]   --> src/lib.rs:23:17
[INFO] [stdout]    |
[INFO] [stdout] 23 |             Err(error) => Err("Error parsing the input"),
[INFO] [stdout]    |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `number` is never read
[INFO] [stdout]  --> src/engine.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Disk{
[INFO] [stdout]   |            ---- field in this struct
[INFO] [stdout] 6 |     pub number: i32,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `number` is never read
[INFO] [stdout]  --> src/engine.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Disk{
[INFO] [stdout]   |            ---- field in this struct
[INFO] [stdout] 6 |     pub number: i32,
[INFO] [stdout]   |         ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `fill` is never read
[INFO] [stdout]   --> src/engine.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct Stack{
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 25 |     pub disks: Vec<Disk>,
[INFO] [stdout] 26 |     pub fill: bool,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `move_disk` is never used
[INFO] [stdout]   --> src/engine.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl Stack {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 45 |     pub fn move_disk(&self, other_stack: Stack) -> Result<(), &'static str>{
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `height` is never read
[INFO] [stdout]   --> src/engine.rs:57:5
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub struct Board{
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 56 |     pub stacks: [Stack; 3],
[INFO] [stdout] 57 |     height: i32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `fill` is never read
[INFO] [stdout]   --> src/engine.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct Stack{
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 25 |     pub disks: Vec<Disk>,
[INFO] [stdout] 26 |     pub fill: bool,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `move_disk` is never used
[INFO] [stdout]   --> src/engine.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl Stack {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 45 |     pub fn move_disk(&self, other_stack: Stack) -> Result<(), &'static str>{
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `height` is never read
[INFO] [stdout]   --> src/engine.rs:57:5
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub struct Board{
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] 56 |     pub stacks: [Stack; 3],
[INFO] [stdout] 57 |     height: i32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 | /         match prompt().as_str() {
[INFO] [stdout] 54 | |            "A" => play(&config),
[INFO] [stdout] 55 | |            "B" | "exit" => break Ok(()),
[INFO] [stdout] 56 | |            _ => todo!(),
[INFO] [stdout] 57 | |         };
[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] 53 |         let _ = match prompt().as_str() {
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 | /         match prompt().as_str() {
[INFO] [stdout] 54 | |            "A" => play(&config),
[INFO] [stdout] 55 | |            "B" | "exit" => break Ok(()),
[INFO] [stdout] 56 | |            _ => todo!(),
[INFO] [stdout] 57 | |         };
[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] 53 |         let _ = match prompt().as_str() {
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.11s
[INFO] running `Command { std: "docker" "inspect" "582e9652cfd81f6188ceab0d941ad8334c7ee256bf4eab805b3d08959e4023c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "582e9652cfd81f6188ceab0d941ad8334c7ee256bf4eab805b3d08959e4023c5", kill_on_drop: false }`
[INFO] [stdout] 582e9652cfd81f6188ceab0d941ad8334c7ee256bf4eab805b3d08959e4023c5
