[INFO] cloning repository https://github.com/xabiercasado/rust_training
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xabiercasado/rust_training" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxabiercasado%2Frust_training", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxabiercasado%2Frust_training'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 81c785c090f01e131a0b8dc936dda267af05ab69
[INFO] checking xabiercasado/rust_training against master#af4a5a13a15fa0c60e06321077ef452f769b42fd for pr-122960-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxabiercasado%2Frust_training" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/xabiercasado/rust_training on toolchain af4a5a13a15fa0c60e06321077ef452f769b42fd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/xabiercasado/rust_training
[INFO] finished tweaking git repo https://github.com/xabiercasado/rust_training
[INFO] tweaked toml for git repo https://github.com/xabiercasado/rust_training written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/xabiercasado/rust_training 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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded leetcode_prelude v0.2.3
[INFO] [stderr]   Downloaded leetcode_test v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 83bb3e71316e59e5cee630b62757be9aefaf4e897b379d05b98f0ef23a81b85d
[INFO] running `Command { std: "docker" "start" "-a" "83bb3e71316e59e5cee630b62757be9aefaf4e897b379d05b98f0ef23a81b85d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "83bb3e71316e59e5cee630b62757be9aefaf4e897b379d05b98f0ef23a81b85d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83bb3e71316e59e5cee630b62757be9aefaf4e897b379d05b98f0ef23a81b85d", kill_on_drop: false }`
[INFO] [stdout] 83bb3e71316e59e5cee630b62757be9aefaf4e897b379d05b98f0ef23a81b85d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8743e70b5b3b575d40e420d85636f8748d1f2f62760564e66e6fc4e7ea8af888
[INFO] running `Command { std: "docker" "start" "-a" "8743e70b5b3b575d40e420d85636f8748d1f2f62760564e66e6fc4e7ea8af888", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.140
[INFO] [stderr]    Compiling serde_json v1.0.82
[INFO] [stderr]    Compiling ryu v1.0.10
[INFO] [stderr]    Compiling leetcode_test v0.1.2
[INFO] [stderr]     Checking leetcode_prelude v0.2.3
[INFO] [stderr]     Checking rust_training v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `leetcode_prelude::vec_string`
[INFO] [stdout]  --> src/sprint1/exercise2_1.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use leetcode_prelude::vec_string;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `leetcode_prelude::vec_string`
[INFO] [stdout]  --> src/sprint1/exercise2_2.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use leetcode_prelude::vec_string;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.06s
[INFO] running `Command { std: "docker" "inspect" "8743e70b5b3b575d40e420d85636f8748d1f2f62760564e66e6fc4e7ea8af888", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8743e70b5b3b575d40e420d85636f8748d1f2f62760564e66e6fc4e7ea8af888", kill_on_drop: false }`
[INFO] [stdout] 8743e70b5b3b575d40e420d85636f8748d1f2f62760564e66e6fc4e7ea8af888