[INFO] cloning repository https://github.com/PiZep/rust_exercices
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/PiZep/rust_exercices" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPiZep%2Frust_exercices", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPiZep%2Frust_exercices'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7772806e056ac28847be7fa689aba29e5ab2bee4
[INFO] testing PiZep/rust_exercices 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%2FPiZep%2Frust_exercices" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PiZep/rust_exercices 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/PiZep/rust_exercices
[INFO] finished tweaking git repo https://github.com/PiZep/rust_exercices
[INFO] tweaked toml for git repo https://github.com/PiZep/rust_exercices written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/PiZep/rust_exercices 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] b0ca0e35371619557a34e9c796025327d668f1bbed0f541d3d2df0330486370e
[INFO] running `Command { std: "docker" "start" "-a" "b0ca0e35371619557a34e9c796025327d668f1bbed0f541d3d2df0330486370e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b0ca0e35371619557a34e9c796025327d668f1bbed0f541d3d2df0330486370e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b0ca0e35371619557a34e9c796025327d668f1bbed0f541d3d2df0330486370e", kill_on_drop: false }`
[INFO] [stdout] b0ca0e35371619557a34e9c796025327d668f1bbed0f541d3d2df0330486370e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 893446c150ab8d3daf38c08c4844449cbc2aca00dabf634e3ac99e78ef7fc026
[INFO] running `Command { std: "docker" "start" "-a" "893446c150ab8d3daf38c08c4844449cbc2aca00dabf634e3ac99e78ef7fc026", kill_on_drop: false }`
[INFO] [stderr]    Compiling rand v0.7.2
[INFO] [stderr]    Compiling collections_ex v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `num` is never read
[INFO] [stdout]   --> src/integer_list.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let mut num: u8 = 0;
[INFO] [stdout]    |             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `range` is never read
[INFO] [stdout]   --> src/integer_list.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let mut range: i64 = 0;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.04s
[INFO] running `Command { std: "docker" "inspect" "893446c150ab8d3daf38c08c4844449cbc2aca00dabf634e3ac99e78ef7fc026", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "893446c150ab8d3daf38c08c4844449cbc2aca00dabf634e3ac99e78ef7fc026", kill_on_drop: false }`
[INFO] [stdout] 893446c150ab8d3daf38c08c4844449cbc2aca00dabf634e3ac99e78ef7fc026
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 495bb24be46c25ab8ff4d2ae5dfbc6357a3fe306326e24f56c0a321c342951b3
[INFO] running `Command { std: "docker" "start" "-a" "495bb24be46c25ab8ff4d2ae5dfbc6357a3fe306326e24f56c0a321c342951b3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling collections_ex v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `num` is never read
[INFO] [stdout]   --> src/integer_list.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let mut num: u8 = 0;
[INFO] [stdout]    |             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `range` is never read
[INFO] [stdout]   --> src/integer_list.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let mut range: i64 = 0;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.71s
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "495bb24be46c25ab8ff4d2ae5dfbc6357a3fe306326e24f56c0a321c342951b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "495bb24be46c25ab8ff4d2ae5dfbc6357a3fe306326e24f56c0a321c342951b3", kill_on_drop: false }`
[INFO] [stdout] 495bb24be46c25ab8ff4d2ae5dfbc6357a3fe306326e24f56c0a321c342951b3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 3ba891ed178f821a070ee6419a89b20016dfec367279f827793bdfa96c044e6b
[INFO] running `Command { std: "docker" "start" "-a" "3ba891ed178f821a070ee6419a89b20016dfec367279f827793bdfa96c044e6b", kill_on_drop: false }`
[INFO] [stderr] warning: value assigned to `num` is never read
[INFO] [stderr]   --> src/integer_list.rs:10:13
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let mut num: u8 = 0;
[INFO] [stderr]    |             ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `range` is never read
[INFO] [stderr]   --> src/integer_list.rs:11:13
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let mut range: i64 = 0;
[INFO] [stderr]    |             ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: `collections_ex` (bin "collections_ex" test) generated 2 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/collections_ex-f86a8d6ead8c06a1)
[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" "3ba891ed178f821a070ee6419a89b20016dfec367279f827793bdfa96c044e6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ba891ed178f821a070ee6419a89b20016dfec367279f827793bdfa96c044e6b", kill_on_drop: false }`
[INFO] [stdout] 3ba891ed178f821a070ee6419a89b20016dfec367279f827793bdfa96c044e6b