[INFO] cloning repository https://github.com/guo40020/learning-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/guo40020/learning-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguo40020%2Flearning-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguo40020%2Flearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f6f6be4caa7b5d7d9b9f30891a8ffebe4a909d94
[INFO] building guo40020/learning-rust against master#ad211ced81509462cdfe4c29ed10f97279a0acae for pr-135216-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguo40020%2Flearning-rust" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/guo40020/learning-rust on toolchain ad211ced81509462cdfe4c29ed10f97279a0acae
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/guo40020/learning-rust
[INFO] finished tweaking git repo https://github.com/guo40020/learning-rust
[INFO] tweaked toml for git repo https://github.com/guo40020/learning-rust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/guo40020/learning-rust 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" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded predicates-core v1.0.2
[INFO] [stderr]   Downloaded predicates v1.0.8
[INFO] [stderr]   Downloaded predicates-tree v1.0.3
[INFO] [stderr]   Downloaded argh_shared v0.1.5
[INFO] [stderr]   Downloaded clicolors-control v1.0.1
[INFO] [stderr]   Downloaded instant v0.1.10
[INFO] [stderr]   Downloaded console v0.14.1
[INFO] [stderr]   Downloaded argh v0.1.5
[INFO] [stderr]   Downloaded inotify v0.7.1
[INFO] [stderr]   Downloaded argh_derive v0.1.5
[INFO] [stderr]   Downloaded encode_unicode v0.3.6
[INFO] [stderr]   Downloaded treeline v0.1.0
[INFO] [stderr]   Downloaded serde_json v1.0.66
[INFO] [stderr]   Downloaded mio v0.6.23
[INFO] [stderr]   Downloaded filetime v0.2.15
[INFO] [stderr]   Downloaded difference v2.0.0
[INFO] [stderr]   Downloaded parking_lot_core v0.8.3
[INFO] [stderr]   Downloaded notify v4.0.17
[INFO] [stderr]   Downloaded toml v0.4.10
[INFO] [stderr]   Downloaded smallvec v1.6.1
[INFO] [stderr]   Downloaded indicatif v0.10.3
[INFO] [stderr]   Downloaded syn v1.0.75
[INFO] [stderr]   Downloaded kernel32-sys v0.2.2
[INFO] [stderr]   Downloaded miow v0.2.2
[INFO] [stderr]   Downloaded proc-macro2 v1.0.28
[INFO] [stderr]   Downloaded serde v1.0.129
[INFO] [stderr]   Downloaded escargot v0.4.0
[INFO] [stderr]   Downloaded winapi v0.2.8
[INFO] [stderr]   Downloaded assert_cmd v0.11.1
[INFO] [stderr]   Downloaded termios v0.3.3
[INFO] [stderr]   Downloaded console v0.7.7
[INFO] [stderr]   Downloaded glob v0.3.0
[INFO] [stderr]   Downloaded terminal_size v0.1.17
[INFO] [stderr]   Downloaded unicode-width v0.1.8
[INFO] [stderr]   Downloaded scopeguard v1.1.0
[INFO] [stderr]   Downloaded libc v0.2.100
[INFO] [stderr]   Downloaded lock_api v0.4.4
[INFO] [stderr]   Downloaded parking_lot v0.11.1
[INFO] [stderr]   Downloaded redox_syscall v0.2.10
[INFO] [stderr]   Downloaded iovec v0.1.4
[INFO] [stderr]   Downloaded slab v0.4.4
[INFO] [stderr]   Downloaded mio-extras v2.0.6
[INFO] [stderr]   Downloaded walkdir v2.3.2
[INFO] [stderr]   Downloaded float-cmp v0.8.0
[INFO] [stderr]   Downloaded lazycell v1.3.0
[INFO] [stderr]   Downloaded net2 v0.2.37
[INFO] [stderr]   Downloaded same-file v1.0.6
[INFO] [stderr]   Downloaded normalize-line-endings v0.3.0
[INFO] [stderr]   Downloaded fsevent v0.4.0
[INFO] [stderr]   Downloaded inotify-sys v0.1.5
[INFO] [stderr]   Downloaded winapi-build v0.1.1
[INFO] [stderr]   Downloaded number_prefix v0.2.8
[INFO] [stderr]   Downloaded fsevent-sys v2.0.1
[INFO] [stderr]   Downloaded ws2_32-sys v0.2.1
[INFO] [stderr]   Downloaded quote v1.0.9
[INFO] [stderr]   Downloaded serde_derive v1.0.129
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c404eb820f181fefc764fd17c58d8c608c0c24a53f547696aaa078811e54cd01
[INFO] running `Command { std: "docker" "start" "-a" "c404eb820f181fefc764fd17c58d8c608c0c24a53f547696aaa078811e54cd01", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c404eb820f181fefc764fd17c58d8c608c0c24a53f547696aaa078811e54cd01", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c404eb820f181fefc764fd17c58d8c608c0c24a53f547696aaa078811e54cd01", kill_on_drop: false }`
[INFO] [stdout] c404eb820f181fefc764fd17c58d8c608c0c24a53f547696aaa078811e54cd01
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 91f0119e2d628c96d74b2dc9872d7057c09ab694e5459e0f5c554c7d1bc57274
[INFO] running `Command { std: "docker" "start" "-a" "91f0119e2d628c96d74b2dc9872d7057c09ab694e5459e0f5c554c7d1bc57274", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustlings v4.6.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.04s
[INFO] running `Command { std: "docker" "inspect" "91f0119e2d628c96d74b2dc9872d7057c09ab694e5459e0f5c554c7d1bc57274", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91f0119e2d628c96d74b2dc9872d7057c09ab694e5459e0f5c554c7d1bc57274", kill_on_drop: false }`
[INFO] [stdout] 91f0119e2d628c96d74b2dc9872d7057c09ab694e5459e0f5c554c7d1bc57274
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 45ac7ffba6a6801865160269a95038bc0a5cced7e8fc9040fe11717a4ca28d71
[INFO] running `Command { std: "docker" "start" "-a" "45ac7ffba6a6801865160269a95038bc0a5cced7e8fc9040fe11717a4ca28d71", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustlings v4.6.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.46s
[INFO] running `Command { std: "docker" "inspect" "45ac7ffba6a6801865160269a95038bc0a5cced7e8fc9040fe11717a4ca28d71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45ac7ffba6a6801865160269a95038bc0a5cced7e8fc9040fe11717a4ca28d71", kill_on_drop: false }`
[INFO] [stdout] 45ac7ffba6a6801865160269a95038bc0a5cced7e8fc9040fe11717a4ca28d71