[INFO] cloning repository https://github.com/relievedFace/ISBN9784065128442
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/relievedFace/ISBN9784065128442" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FrelievedFace%2FISBN9784065128442", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FrelievedFace%2FISBN9784065128442'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2fa54e03f864862d62d3293f1c0d0254ad35c0ed
[INFO] checking relievedFace/ISBN9784065128442 against try#409ef99a7d4dc96ae91f65d4b48413ed174514d6 for pr-137633
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FrelievedFace%2FISBN9784065128442" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/relievedFace/ISBN9784065128442 on toolchain 409ef99a7d4dc96ae91f65d4b48413ed174514d6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+409ef99a7d4dc96ae91f65d4b48413ed174514d6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/relievedFace/ISBN9784065128442
[INFO] finished tweaking git repo https://github.com/relievedFace/ISBN9784065128442
[INFO] tweaked toml for git repo https://github.com/relievedFace/ISBN9784065128442 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/relievedFace/ISBN9784065128442 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" "+409ef99a7d4dc96ae91f65d4b48413ed174514d6" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking relievedFace/ISBN9784065128442 against try#409ef99a7d4dc96ae91f65d4b48413ed174514d6 for pr-137633
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FrelievedFace%2FISBN9784065128442" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/relievedFace/ISBN9784065128442 on toolchain 409ef99a7d4dc96ae91f65d4b48413ed174514d6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+409ef99a7d4dc96ae91f65d4b48413ed174514d6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/relievedFace/ISBN9784065128442
[INFO] finished tweaking git repo https://github.com/relievedFace/ISBN9784065128442
[INFO] tweaked toml for git repo https://github.com/relievedFace/ISBN9784065128442 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/relievedFace/ISBN9784065128442 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" "+409ef99a7d4dc96ae91f65d4b48413ed174514d6" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proconio v0.4.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+409ef99a7d4dc96ae91f65d4b48413ed174514d6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 104580156b553ebfc7cc7d4fc8449baf8ec1adb5a9079c54e2fda7ebd6d25e14
[INFO] running `Command { std: "docker" "start" "-a" "104580156b553ebfc7cc7d4fc8449baf8ec1adb5a9079c54e2fda7ebd6d25e14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "104580156b553ebfc7cc7d4fc8449baf8ec1adb5a9079c54e2fda7ebd6d25e14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "104580156b553ebfc7cc7d4fc8449baf8ec1adb5a9079c54e2fda7ebd6d25e14", kill_on_drop: false }`
[INFO] [stdout] 104580156b553ebfc7cc7d4fc8449baf8ec1adb5a9079c54e2fda7ebd6d25e14
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+409ef99a7d4dc96ae91f65d4b48413ed174514d6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 23e028788fb624a10e53a07f723663a785b408cbf950be6a1ab3983d8f0d1e48
[INFO] running `Command { std: "docker" "start" "-a" "23e028788fb624a10e53a07f723663a785b408cbf950be6a1ab3983d8f0d1e48", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.9.0
[INFO] [stderr]     Checking superslice v1.0.0
[INFO] [stderr]     Checking proconio v0.4.5
[INFO] [stderr]     Checking itertools v0.11.0
[INFO] [stderr]     Checking ISBN9784065128442 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]  --> src/code_2-2.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut count = 0;
[INFO] [stdout]   |             ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider using `_count` instead
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/code_2-2.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     for i in 0..n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/code_2-2.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |         for j in 0..n {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]  --> src/code_2-1.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut count = 0;
[INFO] [stdout]   |             ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider using `_count` instead
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/code_2-1.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     for i in 0..n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `is_same` and `size` are never used
[INFO] [stdout]   --> src/code_11-4.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 8  | impl UnionFind {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn is_same(&mut self, x: usize, y: usize) -> bool {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 46 |     fn size(&mut self, x: usize) -> usize {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]  --> src/code_2-1.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut count = 0;
[INFO] [stdout]   |             ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider using `_count` instead
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/code_2-1.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     for i in 0..n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `size` is never used
[INFO] [stdout]   --> src/code_15-1.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 8  | impl UnionFind {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 46 |     fn size(&mut self, x: usize) -> usize {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]  --> src/code_2-2.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut count = 0;
[INFO] [stdout]   |             ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider using `_count` instead
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/code_2-2.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     for i in 0..n {
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]   --> src/code_2-2.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |         for j in 0..n {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `size` is never used
[INFO] [stdout]   --> src/code_11-3.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 6  | impl UnionFind {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 44 |     fn size(&mut self, x: usize) -> usize {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `size` is never used
[INFO] [stdout]   --> src/code_15-1.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 8  | impl UnionFind {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 46 |     fn size(&mut self, x: usize) -> usize {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `is_same` and `size` are never used
[INFO] [stdout]   --> src/code_11-4.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 8  | impl UnionFind {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 25 |     fn is_same(&mut self, x: usize, y: usize) -> bool {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 46 |     fn size(&mut self, x: usize) -> usize {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `size` is never used
[INFO] [stdout]   --> src/code_11-3.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 6  | impl UnionFind {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 44 |     fn size(&mut self, x: usize) -> usize {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `to` and `w` are never read
[INFO] [stdout]  --> src/code_10-4.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Edge {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 5 |     to: usize,
[INFO] [stdout]   |     ^^
[INFO] [stdout] 6 |     w: usize,
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Edge` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `to` and `w` are never read
[INFO] [stdout]  --> src/code_10-4.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Edge {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 5 |     to: usize,
[INFO] [stdout]   |     ^^
[INFO] [stdout] 6 |     w: usize,
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Edge` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.32s
[INFO] running `Command { std: "docker" "inspect" "23e028788fb624a10e53a07f723663a785b408cbf950be6a1ab3983d8f0d1e48", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23e028788fb624a10e53a07f723663a785b408cbf950be6a1ab3983d8f0d1e48", kill_on_drop: false }`
[INFO] [stdout] 23e028788fb624a10e53a07f723663a785b408cbf950be6a1ab3983d8f0d1e48