[INFO] cloning repository https://github.com/MilesChan/rustlings-answer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MilesChan/rustlings-answer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMilesChan%2Frustlings-answer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMilesChan%2Frustlings-answer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] aff36ddbecfbff1feef7a2af43d6df12b987dfd2
[INFO] checking MilesChan/rustlings-answer against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMilesChan%2Frustlings-answer" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MilesChan/rustlings-answer on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MilesChan/rustlings-answer
[INFO] finished tweaking git repo https://github.com/MilesChan/rustlings-answer
[INFO] tweaked toml for git repo https://github.com/MilesChan/rustlings-answer written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/MilesChan/rustlings-answer 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2eaca5495def13da25ac250d48dad3b2507fd911d65836565fd313dc6f0212eb
[INFO] running `Command { std: "docker" "start" "-a" "2eaca5495def13da25ac250d48dad3b2507fd911d65836565fd313dc6f0212eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2eaca5495def13da25ac250d48dad3b2507fd911d65836565fd313dc6f0212eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2eaca5495def13da25ac250d48dad3b2507fd911d65836565fd313dc6f0212eb", kill_on_drop: false }`
[INFO] [stdout] 2eaca5495def13da25ac250d48dad3b2507fd911d65836565fd313dc6f0212eb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6725c3b1e226b225ff76798dd7ae51d20759a65a8e7f87fc0843507213328923
[INFO] running `Command { std: "docker" "start" "-a" "6725c3b1e226b225ff76798dd7ae51d20759a65a8e7f87fc0843507213328923", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.188
[INFO] [stderr]     Checking memchr v2.6.3
[INFO] [stderr]     Checking anstyle v1.0.2
[INFO] [stderr]     Checking regex-syntax v0.7.5
[INFO] [stderr]     Checking hashbrown v0.14.0
[INFO] [stderr]    Compiling portable-atomic v1.4.3
[INFO] [stderr]    Compiling num-traits v0.2.16
[INFO] [stderr]     Checking winnow v0.5.15
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]     Checking clap_lex v0.5.1
[INFO] [stderr]    Compiling syn v2.0.31
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking either v1.9.0
[INFO] [stderr]     Checking filetime v0.2.22
[INFO] [stderr]     Checking difflib v0.4.0
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking anstream v0.5.0
[INFO] [stderr]     Checking aho-corasick v1.0.5
[INFO] [stderr]     Checking clap_builder v4.4.2
[INFO] [stderr]     Checking indexmap v2.0.0
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]     Checking notify v4.0.17
[INFO] [stderr]     Checking indicatif v0.17.6
[INFO] [stderr]     Checking float-cmp v0.9.0
[INFO] [stderr]     Checking regex-automata v0.3.8
[INFO] [stderr]    Compiling serde_derive v1.0.188
[INFO] [stderr]    Compiling clap_derive v4.4.2
[INFO] [stderr]     Checking clap v4.4.2
[INFO] [stderr]     Checking regex v1.9.5
[INFO] [stderr]     Checking bstr v1.6.2
[INFO] [stderr]     Checking predicates v3.0.3
[INFO] [stderr]     Checking assert_cmd v2.0.12
[INFO] [stderr]     Checking toml_datetime v0.6.3
[INFO] [stderr]     Checking serde_spanned v0.6.3
[INFO] [stderr]     Checking serde_json v1.0.105
[INFO] [stderr]     Checking toml_edit v0.19.14
[INFO] [stderr]     Checking toml v0.7.6
[INFO] [stderr]     Checking rustlings v5.6.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 19.60s
[INFO] running `Command { std: "docker" "inspect" "6725c3b1e226b225ff76798dd7ae51d20759a65a8e7f87fc0843507213328923", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6725c3b1e226b225ff76798dd7ae51d20759a65a8e7f87fc0843507213328923", kill_on_drop: false }`
[INFO] [stdout] 6725c3b1e226b225ff76798dd7ae51d20759a65a8e7f87fc0843507213328923
[INFO] checking MilesChan/rustlings-answer against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMilesChan%2Frustlings-answer" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MilesChan/rustlings-answer on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MilesChan/rustlings-answer
[INFO] finished tweaking git repo https://github.com/MilesChan/rustlings-answer
[INFO] tweaked toml for git repo https://github.com/MilesChan/rustlings-answer written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/MilesChan/rustlings-answer 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9b988769d9d38bbd00ae5be73602d3e20be6c73e2a166b6212e06e4ea13b81f1
[INFO] running `Command { std: "docker" "start" "-a" "9b988769d9d38bbd00ae5be73602d3e20be6c73e2a166b6212e06e4ea13b81f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9b988769d9d38bbd00ae5be73602d3e20be6c73e2a166b6212e06e4ea13b81f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b988769d9d38bbd00ae5be73602d3e20be6c73e2a166b6212e06e4ea13b81f1", kill_on_drop: false }`
[INFO] [stdout] 9b988769d9d38bbd00ae5be73602d3e20be6c73e2a166b6212e06e4ea13b81f1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2664dbf3bb0deed20ab522bd28d617b26acbbec15ff46a07a4bea894f52340d9
[INFO] running `Command { std: "docker" "start" "-a" "2664dbf3bb0deed20ab522bd28d617b26acbbec15ff46a07a4bea894f52340d9", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.188
[INFO] [stderr]     Checking memchr v2.6.3
[INFO] [stderr]     Checking regex-syntax v0.7.5
[INFO] [stderr]     Checking anstyle v1.0.2
[INFO] [stderr]    Compiling portable-atomic v1.4.3
[INFO] [stderr]     Checking hashbrown v0.14.0
[INFO] [stderr]    Compiling num-traits v0.2.16
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]     Checking clap_lex v0.5.1
[INFO] [stderr]     Checking winnow v0.5.15
[INFO] [stderr]     Checking either v1.9.0
[INFO] [stderr]    Compiling syn v2.0.31
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking filetime v0.2.22
[INFO] [stderr]     Checking difflib v0.4.0
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking itertools v0.10.5
[INFO] [stderr]     Checking anstream v0.5.0
[INFO] [stderr]     Checking aho-corasick v1.0.5
[INFO] [stderr]     Checking clap_builder v4.4.2
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]     Checking notify v4.0.17
[INFO] [stderr]     Checking indexmap v2.0.0
[INFO] [stderr]     Checking indicatif v0.17.6
[INFO] [stderr]     Checking float-cmp v0.9.0
[INFO] [stderr]     Checking regex-automata v0.3.8
[INFO] [stderr]    Compiling serde_derive v1.0.188
[INFO] [stderr]    Compiling clap_derive v4.4.2
[INFO] [stderr]     Checking regex v1.9.5
[INFO] [stderr]     Checking bstr v1.6.2
[INFO] [stderr]     Checking predicates v3.0.3
[INFO] [stderr]     Checking assert_cmd v2.0.12
[INFO] [stderr]     Checking clap v4.4.2
[INFO] [stderr]     Checking serde_spanned v0.6.3
[INFO] [stderr]     Checking toml_datetime v0.6.3
[INFO] [stderr]     Checking serde_json v1.0.105
[INFO] [stderr]     Checking toml_edit v0.19.14
[INFO] [stderr]     Checking toml v0.7.6
[INFO] [stderr]     Checking rustlings v5.6.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 22.22s
[INFO] running `Command { std: "docker" "inspect" "2664dbf3bb0deed20ab522bd28d617b26acbbec15ff46a07a4bea894f52340d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2664dbf3bb0deed20ab522bd28d617b26acbbec15ff46a07a4bea894f52340d9", kill_on_drop: false }`
[INFO] [stdout] 2664dbf3bb0deed20ab522bd28d617b26acbbec15ff46a07a4bea894f52340d9