[INFO] cloning repository https://github.com/RheoTommy/at_coder
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/RheoTommy/at_coder" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRheoTommy%2Fat_coder", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRheoTommy%2Fat_coder'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 69efd4cfb08d4d2bd8758514e2c03714ca8ce827
[INFO] testing RheoTommy/at_coder against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRheoTommy%2Fat_coder" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/RheoTommy/at_coder on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/RheoTommy/at_coder
[INFO] finished tweaking git repo https://github.com/RheoTommy/at_coder
[INFO] tweaked toml for git repo https://github.com/RheoTommy/at_coder written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/RheoTommy/at_coder already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3212b9b0ac383c0dce5b73e5ede56f8d7335d822f28039d0f76ef3eae73ead8b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3212b9b0ac383c0dce5b73e5ede56f8d7335d822f28039d0f76ef3eae73ead8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3212b9b0ac383c0dce5b73e5ede56f8d7335d822f28039d0f76ef3eae73ead8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3212b9b0ac383c0dce5b73e5ede56f8d7335d822f28039d0f76ef3eae73ead8b", kill_on_drop: false }`
[INFO] [stdout] 3212b9b0ac383c0dce5b73e5ede56f8d7335d822f28039d0f76ef3eae73ead8b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 20cc75dd96fddd99b7f53428b8be944279965435aebf69a9913c7d38f3254152
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "20cc75dd96fddd99b7f53428b8be944279965435aebf69a9913c7d38f3254152", 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]    Compiling libc v0.2.77
[INFO] [stderr]    Compiling either v1.5.3
[INFO] [stderr]    Compiling syn v1.0.41
[INFO] [stderr]    Compiling ndarray v0.13.0
[INFO] [stderr]    Compiling regex-syntax v0.6.18
[INFO] [stderr]    Compiling fixedbitset v0.2.0
[INFO] [stderr]    Compiling permutohedron v0.2.4
[INFO] [stderr]    Compiling cargo-snippet v0.6.5
[INFO] [stderr]    Compiling bitset-fixed v0.1.0
[INFO] [stderr]    Compiling whiteread v0.5.0
[INFO] [stderr]    Compiling ascii v1.0.0
[INFO] [stderr]    Compiling superslice v1.0.0
[INFO] [stderr]    Compiling text_io v0.1.8
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-iter v0.1.40
[INFO] [stderr]    Compiling indexmap v1.3.2
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling petgraph v0.5.0
[INFO] [stderr]    Compiling rand_pcg v0.2.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand_hc v0.2.0
[INFO] [stderr]    Compiling approx v0.3.2
[INFO] [stderr]    Compiling ordered-float v1.0.2
[INFO] [stderr]    Compiling itertools-num v0.1.3
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling alga v0.9.3
[INFO] [stderr]    Compiling regex v1.3.6
[INFO] [stderr]    Compiling rand_distr v0.2.2
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling nalgebra v0.20.0
[INFO] [stderr]    Compiling num v0.2.1
[INFO] [stderr]    Compiling num-derive v0.3.0
[INFO] [stderr]    Compiling at_coder v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/main.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/main.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/d.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/d.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/e.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/e.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/f.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/f.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/b.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/b.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/c.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/c.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/a.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/a.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 43.10s
[INFO] running `Command { std: "docker" "inspect" "20cc75dd96fddd99b7f53428b8be944279965435aebf69a9913c7d38f3254152", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20cc75dd96fddd99b7f53428b8be944279965435aebf69a9913c7d38f3254152", kill_on_drop: false }`
[INFO] [stdout] 20cc75dd96fddd99b7f53428b8be944279965435aebf69a9913c7d38f3254152
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dc47065ee383a61fd2737fd2d0dd3237f0951b995e7ea9c19bd615373508c464
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "dc47065ee383a61fd2737fd2d0dd3237f0951b995e7ea9c19bd615373508c464", kill_on_drop: false }`
[INFO] [stderr]    Compiling at_coder v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/a.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/a.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/b.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/b.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/main.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/main.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/d.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/d.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/e.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/e.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/f.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/f.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `io`
[INFO] [stdout]   --> src/bin/c.rs:27:13
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/c.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut io = IO::new();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.99s
[INFO] running `Command { std: "docker" "inspect" "dc47065ee383a61fd2737fd2d0dd3237f0951b995e7ea9c19bd615373508c464", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc47065ee383a61fd2737fd2d0dd3237f0951b995e7ea9c19bd615373508c464", kill_on_drop: false }`
[INFO] [stdout] dc47065ee383a61fd2737fd2d0dd3237f0951b995e7ea9c19bd615373508c464
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 03beb1463d3434bbaea3809ca11b995cd2102574af6b470e6c266576f3d8a81b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "03beb1463d3434bbaea3809ca11b995cd2102574af6b470e6c266576f3d8a81b", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `io`
[INFO] [stderr]   --> src/bin/b.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/b.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |         ----^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `io`
[INFO] [stderr]   --> src/bin/d.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/d.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |         ----^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `io`
[INFO] [stderr]   --> src/bin/c.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/c.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |         ----^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `io`
[INFO] [stderr]   --> src/bin/f.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/f.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |         ----^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `io`
[INFO] [stderr]   --> src/bin/main.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/main.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |         ----^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `io`
[INFO] [stderr]   --> src/bin/a.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/a.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |         ----^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `io`
[INFO] [stderr]   --> src/bin/e.rs:27:13
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |             ^^ help: if this is intentional, prefix it with an underscore: `_io`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/e.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut io = IO::new();
[INFO] [stderr]    |         ----^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `at_coder` (bin "b" test) generated 2 warnings
[INFO] [stderr] warning: `at_coder` (bin "d" test) generated 2 warnings
[INFO] [stderr] warning: `at_coder` (bin "c" test) generated 2 warnings
[INFO] [stderr] warning: `at_coder` (bin "f" test) generated 2 warnings
[INFO] [stderr] warning: `at_coder` (bin "main" test) generated 2 warnings
[INFO] [stderr] warning: `at_coder` (bin "a" test) generated 2 warnings
[INFO] [stderr] warning: `at_coder` (bin "e" test) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/at_coder-3fa713ec838fe7a9)
[INFO] [stdout] 
[INFO] [stdout] running 34 tests
[INFO] [stdout] test algorithms::binary_search::test_binary_search ... ok
[INFO] [stdout] test algorithms::binary_search::test_vec_binary_search ... ok
[INFO] [stdout] test algorithms::subset::test_subset ... ok
[INFO] [stdout] test algorithms::lcs::test_lcs ... ok
[INFO] [stdout] test algorithms::z_algo::test_z_algo ... ok
[INFO] [stdout] test basic::accumulate::test_accumulate ... ok
[INFO] [stdout] test basic::coord_comp::test_compress ... ok
[INFO] [stdout] test basic::search::test_around ... ok
[INFO] [stdout] test graph::lca::test_lca ... ok
[INFO] [stdout] test math::util::test_mod_inv ... ok
[INFO] [stdout] test math::util::test_mod_div ... ok
[INFO] [stdout] test math::util::test_lcm ... ok
[INFO] [stdout] test math::util::test_mod_pow ... ok
[INFO] [stdout] test math::util::test_pow ... ok
[INFO] [stdout] test structures::disjoint_sparse_table::test_disjoint_sparse_table ... ok
[INFO] [stdout] test structures::fenwick_tree::test_fenwick_tree ... ok
[INFO] [stdout] test structures::lazy_seg_tree::test_lazy_seg_tree ... ok
[INFO] [stdout] test structures::seg_tree::test_seg_tree ... ok
[INFO] [stdout] test math::util::test_gcd ... ok
[INFO] [stdout] test algorithms::permutation::test_permutation ... ok
[INFO] [stdout] test math::util::test_is_prime ... ok
[INFO] [stdout] test basic::search::test_next ... ok
[INFO] [stdout] test algorithms::lis::test_lis ... ok
[INFO] [stdout] test structures::sparse_table::test_sparse_table ... ok
[INFO] [stdout] test structures::two_dim_fenwick_tree::test_fenwick_tree ... ok
[INFO] [stdout] test structures::union_find::test_union_find ... ok
[INFO] [stdout] test math::eratosthenes::test_eratosthenes ... ok
[INFO] [stdout] test math::util::test_float_to_int ... ok
[INFO] [stdout] test algorithms::rle::test_rle ... ok
[INFO] [stdout] test math::mod_int::test_static_mod_int ... ok
[INFO] [stdout] test math::mod_int::test_comb ... ok
[INFO] [stdout] test math::util::test_divisors ... ok
[INFO] [stdout] test math::util::test_ext_gcd ... ok
[INFO] [stdout] test math::util::test_factorization ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 34 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/a-e37fe2b625b90910)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/b-fbca130c670e1252)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/c-163e36a129e6c0bf)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/d-ee6aea660dfd7aab)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/e-96f1c845f5b038f6)
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/f-79b2ff8361d1adf8)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/main-294a1d67cf3444b1)
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests at_coder
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "03beb1463d3434bbaea3809ca11b995cd2102574af6b470e6c266576f3d8a81b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03beb1463d3434bbaea3809ca11b995cd2102574af6b470e6c266576f3d8a81b", kill_on_drop: false }`
[INFO] [stdout] 03beb1463d3434bbaea3809ca11b995cd2102574af6b470e6c266576f3d8a81b