[INFO] cloning repository https://github.com/hanjinliu/ipyprev
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hanjinliu/ipyprev" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhanjinliu%2Fipyprev", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhanjinliu%2Fipyprev'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4dc81bc4013aaba920b0e7467193ae17da20f158
[INFO] checking hanjinliu/ipyprev against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhanjinliu%2Fipyprev" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hanjinliu/ipyprev 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/hanjinliu/ipyprev
[INFO] finished tweaking git repo https://github.com/hanjinliu/ipyprev
[INFO] tweaked toml for git repo https://github.com/hanjinliu/ipyprev written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/hanjinliu/ipyprev 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 05d0f009aa859eaf04ad87d7024aa442ccdb718f5472b4160fde8490882cc80f
[INFO] running `Command { std: "docker" "start" "-a" "05d0f009aa859eaf04ad87d7024aa442ccdb718f5472b4160fde8490882cc80f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "05d0f009aa859eaf04ad87d7024aa442ccdb718f5472b4160fde8490882cc80f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "05d0f009aa859eaf04ad87d7024aa442ccdb718f5472b4160fde8490882cc80f", kill_on_drop: false }`
[INFO] [stdout] 05d0f009aa859eaf04ad87d7024aa442ccdb718f5472b4160fde8490882cc80f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 9f50195442613c2ce7e9db681f3d0e6edb4593a9f12b3b8829d14f12a13897a8
[INFO] running `Command { std: "docker" "start" "-a" "9f50195442613c2ce7e9db681f3d0e6edb4593a9f12b3b8829d14f12a13897a8", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]    Compiling pkg-config v0.3.25
[INFO] [stderr]    Compiling libc v0.2.132
[INFO] [stderr]    Compiling indexmap v1.9.1
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling serde_derive v1.0.144
[INFO] [stderr]     Checking num_threads v0.1.6
[INFO] [stderr]    Compiling unicode-segmentation v1.9.0
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking line-wrap v0.1.1
[INFO] [stderr]     Checking miniz_oxide v0.5.3
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.32
[INFO] [stderr]     Checking linked-hash-map v0.5.6
[INFO] [stderr]     Checking once_cell v1.13.1
[INFO] [stderr]     Checking xml-rs v0.8.4
[INFO] [stderr]     Checking yaml-rust v0.4.5
[INFO] [stderr]     Checking flate2 v1.0.24
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]     Checking time v0.3.13
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]    Compiling onig_sys v69.8.1
[INFO] [stderr]     Checking thiserror v1.0.32
[INFO] [stderr]     Checking structopt v0.3.26
[INFO] [stderr]     Checking serde v1.0.144
[INFO] [stderr]     Checking onig v6.4.0
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking serde_json v1.0.85
[INFO] [stderr]     Checking plist v1.3.1
[INFO] [stderr]     Checking syntect v5.0.0
[INFO] [stderr]     Checking ipyprev v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 25.24s
[INFO] running `Command { std: "docker" "inspect" "9f50195442613c2ce7e9db681f3d0e6edb4593a9f12b3b8829d14f12a13897a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f50195442613c2ce7e9db681f3d0e6edb4593a9f12b3b8829d14f12a13897a8", kill_on_drop: false }`
[INFO] [stdout] 9f50195442613c2ce7e9db681f3d0e6edb4593a9f12b3b8829d14f12a13897a8
[INFO] checking hanjinliu/ipyprev against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhanjinliu%2Fipyprev" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hanjinliu/ipyprev on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hanjinliu/ipyprev
[INFO] finished tweaking git repo https://github.com/hanjinliu/ipyprev
[INFO] tweaked toml for git repo https://github.com/hanjinliu/ipyprev written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/hanjinliu/ipyprev 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0c9c1d76b8e60594e8bc1c3e174a22f456739480693b0b158a8670e0ffbcbf17
[INFO] running `Command { std: "docker" "start" "-a" "0c9c1d76b8e60594e8bc1c3e174a22f456739480693b0b158a8670e0ffbcbf17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0c9c1d76b8e60594e8bc1c3e174a22f456739480693b0b158a8670e0ffbcbf17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c9c1d76b8e60594e8bc1c3e174a22f456739480693b0b158a8670e0ffbcbf17", kill_on_drop: false }`
[INFO] [stdout] 0c9c1d76b8e60594e8bc1c3e174a22f456739480693b0b158a8670e0ffbcbf17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8090b8834613481174b10a13d7d3132dc8482ec8429bf785d6060a6cb382d331
[INFO] running `Command { std: "docker" "start" "-a" "8090b8834613481174b10a13d7d3132dc8482ec8429bf785d6060a6cb382d331", kill_on_drop: false }`
[INFO] [stderr]    Compiling pkg-config v0.3.25
[INFO] [stderr]    Compiling cc v1.0.73
[INFO] [stderr]    Compiling libc v0.2.132
[INFO] [stderr]    Compiling indexmap v1.9.1
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling serde_derive v1.0.144
[INFO] [stderr]    Compiling unicode-segmentation v1.9.0
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]     Checking num_threads v0.1.6
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking miniz_oxide v0.5.3
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking line-wrap v0.1.1
[INFO] [stderr]    Compiling thiserror-impl v1.0.32
[INFO] [stderr]     Checking linked-hash-map v0.5.6
[INFO] [stderr]     Checking xml-rs v0.8.4
[INFO] [stderr]     Checking once_cell v1.13.1
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking yaml-rust v0.4.5
[INFO] [stderr]     Checking time v0.3.13
[INFO] [stderr]     Checking flate2 v1.0.24
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]    Compiling onig_sys v69.8.1
[INFO] [stderr]     Checking thiserror v1.0.32
[INFO] [stderr]     Checking structopt v0.3.26
[INFO] [stderr]     Checking serde v1.0.144
[INFO] [stderr]     Checking onig v6.4.0
[INFO] [stderr]     Checking serde_json v1.0.85
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking plist v1.3.1
[INFO] [stderr]     Checking syntect v5.0.0
[INFO] [stderr]     Checking ipyprev v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 27.19s
[INFO] running `Command { std: "docker" "inspect" "8090b8834613481174b10a13d7d3132dc8482ec8429bf785d6060a6cb382d331", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8090b8834613481174b10a13d7d3132dc8482ec8429bf785d6060a6cb382d331", kill_on_drop: false }`
[INFO] [stdout] 8090b8834613481174b10a13d7d3132dc8482ec8429bf785d6060a6cb382d331