[INFO] cloning repository https://github.com/LearningOS/learn_rust_rustlings-Soptionalgit
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LearningOS/learn_rust_rustlings-Soptionalgit" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLearningOS%2Flearn_rust_rustlings-Soptionalgit", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLearningOS%2Flearn_rust_rustlings-Soptionalgit'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8699cdb5923c4b07028697a2e4625440d2969ed1
[INFO] checking LearningOS/learn_rust_rustlings-Soptionalgit/8699cdb5923c4b07028697a2e4625440d2969ed1 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLearningOS%2Flearn_rust_rustlings-Soptionalgit" "/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/LearningOS/learn_rust_rustlings-Soptionalgit on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/LearningOS/learn_rust_rustlings-Soptionalgit
[INFO] finished tweaking git repo https://github.com/LearningOS/learn_rust_rustlings-Soptionalgit
[INFO] tweaked toml for git repo https://github.com/LearningOS/learn_rust_rustlings-Soptionalgit written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/LearningOS/learn_rust_rustlings-Soptionalgit 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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]      Locking 1 package to latest compatible version
[INFO] [stderr]     Updating rustlings v4.7.1 (/workspace/builds/worker-2-tc1/source) -> v4.8.0
[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-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fdd32d1ef2161900ab87100642685cc8871a3ef8641dd5d7a70208fd8f53ca3d
[INFO] running `Command { std: "docker" "start" "-a" "fdd32d1ef2161900ab87100642685cc8871a3ef8641dd5d7a70208fd8f53ca3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fdd32d1ef2161900ab87100642685cc8871a3ef8641dd5d7a70208fd8f53ca3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fdd32d1ef2161900ab87100642685cc8871a3ef8641dd5d7a70208fd8f53ca3d", kill_on_drop: false }`
[INFO] [stdout] fdd32d1ef2161900ab87100642685cc8871a3ef8641dd5d7a70208fd8f53ca3d
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 64ca0629acac20aa725d82e305936516e2007220ee61203b2c0f4eee863dc952
[INFO] running `Command { std: "docker" "start" "-a" "64ca0629acac20aa725d82e305936516e2007220ee61203b2c0f4eee863dc952", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_json v1.0.81
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]     Checking once_cell v1.10.0
[INFO] [stderr]     Checking number_prefix v0.4.0
[INFO] [stderr]     Checking home v0.5.3
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]     Checking toml v0.5.9
[INFO] [stderr]     Checking float-cmp v0.8.0
[INFO] [stderr]     Checking escargot v0.4.0
[INFO] [stderr]     Checking console v0.15.0
[INFO] [stderr]     Checking predicates v1.0.8
[INFO] [stderr]     Checking indicatif v0.16.2
[INFO] [stderr]     Checking assert_cmd v0.11.1
[INFO] [stderr]     Checking rustlings v4.8.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.87s
[INFO] running `Command { std: "docker" "inspect" "64ca0629acac20aa725d82e305936516e2007220ee61203b2c0f4eee863dc952", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64ca0629acac20aa725d82e305936516e2007220ee61203b2c0f4eee863dc952", kill_on_drop: false }`
[INFO] [stdout] 64ca0629acac20aa725d82e305936516e2007220ee61203b2c0f4eee863dc952