[INFO] cloning repository https://github.com/zachfurie/rustgrad
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zachfurie/rustgrad" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzachfurie%2Frustgrad", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzachfurie%2Frustgrad'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ae5b2bc53769aa631c59370aa724d3142d65ff0c
[INFO] checking zachfurie/rustgrad against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzachfurie%2Frustgrad" "/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/zachfurie/rustgrad 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/zachfurie/rustgrad
[INFO] finished tweaking git repo https://github.com/zachfurie/rustgrad
[INFO] tweaked toml for git repo https://github.com/zachfurie/rustgrad written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/zachfurie/rustgrad 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]  Downloading crates ...
[INFO] [stderr]   Downloaded iana-time-zone v0.1.51
[INFO] [stderr]   Downloaded indicatif v0.17.1
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3192b00fbcc70c1250cf691242d02f62fe5bb4dfa7355726c3e9fa98691e8707
[INFO] running `Command { std: "docker" "start" "-a" "3192b00fbcc70c1250cf691242d02f62fe5bb4dfa7355726c3e9fa98691e8707", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3192b00fbcc70c1250cf691242d02f62fe5bb4dfa7355726c3e9fa98691e8707", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3192b00fbcc70c1250cf691242d02f62fe5bb4dfa7355726c3e9fa98691e8707", kill_on_drop: false }`
[INFO] [stdout] 3192b00fbcc70c1250cf691242d02f62fe5bb4dfa7355726c3e9fa98691e8707
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cd95ea42a897b34f66e1a2ba74703e494f1834a511c6571f793f93722d212fbb
[INFO] running `Command { std: "docker" "start" "-a" "cd95ea42a897b34f66e1a2ba74703e494f1834a511c6571f793f93722d212fbb", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.135
[INFO] [stderr]    Compiling crossbeam-utils v0.8.12
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling libm v0.2.5
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.11
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling serde v1.0.145
[INFO] [stderr]    Compiling rayon-core v1.9.3
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling rayon v1.5.3
[INFO] [stderr]     Checking unicode-width v0.1.10
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking number_prefix v0.4.0
[INFO] [stderr]     Checking either v1.8.0
[INFO] [stderr]     Checking iana-time-zone v0.1.51
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]     Checking smallvec v1.10.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.6
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking crossbeam-deque v0.8.2
[INFO] [stderr]     Checking getrandom v0.2.7
[INFO] [stderr]     Checking terminal_size v0.1.17
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking console v0.15.2
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking indicatif v0.17.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking chrono v0.4.22
[INFO] [stderr]     Checking rand_distr v0.4.3
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking rust_grad v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.70s
[INFO] running `Command { std: "docker" "inspect" "cd95ea42a897b34f66e1a2ba74703e494f1834a511c6571f793f93722d212fbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd95ea42a897b34f66e1a2ba74703e494f1834a511c6571f793f93722d212fbb", kill_on_drop: false }`
[INFO] [stdout] cd95ea42a897b34f66e1a2ba74703e494f1834a511c6571f793f93722d212fbb
[INFO] checking zachfurie/rustgrad against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzachfurie%2Frustgrad" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zachfurie/rustgrad 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/zachfurie/rustgrad
[INFO] finished tweaking git repo https://github.com/zachfurie/rustgrad
[INFO] tweaked toml for git repo https://github.com/zachfurie/rustgrad written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/zachfurie/rustgrad 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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] ed9cde30f0d0108aa08e2ca9bc315fa498e9e7f4795b2d76a57cbdc5594c6f23
[INFO] running `Command { std: "docker" "start" "-a" "ed9cde30f0d0108aa08e2ca9bc315fa498e9e7f4795b2d76a57cbdc5594c6f23", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ed9cde30f0d0108aa08e2ca9bc315fa498e9e7f4795b2d76a57cbdc5594c6f23", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed9cde30f0d0108aa08e2ca9bc315fa498e9e7f4795b2d76a57cbdc5594c6f23", kill_on_drop: false }`
[INFO] [stdout] ed9cde30f0d0108aa08e2ca9bc315fa498e9e7f4795b2d76a57cbdc5594c6f23
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 9208e4282e1097ceecb14584bf109c23451337f76d1ee5166e4dfa328bc508b2
[INFO] running `Command { std: "docker" "start" "-a" "9208e4282e1097ceecb14584bf109c23451337f76d1ee5166e4dfa328bc508b2", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.135
[INFO] [stderr]    Compiling crossbeam-utils v0.8.12
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling libm v0.2.5
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.11
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling serde v1.0.145
[INFO] [stderr]    Compiling rayon-core v1.9.3
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling rayon v1.5.3
[INFO] [stderr]     Checking unicode-width v0.1.10
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking iana-time-zone v0.1.51
[INFO] [stderr]     Checking ryu v1.0.11
[INFO] [stderr]     Checking either v1.8.0
[INFO] [stderr]     Checking number_prefix v0.4.0
[INFO] [stderr]     Checking smallvec v1.10.0
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking crossbeam-channel v0.5.6
[INFO] [stderr]     Checking crossbeam-deque v0.8.2
[INFO] [stderr]     Checking getrandom v0.2.7
[INFO] [stderr]     Checking terminal_size v0.1.17
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking console v0.15.2
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking indicatif v0.17.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking rand_distr v0.4.3
[INFO] [stderr]     Checking chrono v0.4.22
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking rust_grad v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.27s
[INFO] running `Command { std: "docker" "inspect" "9208e4282e1097ceecb14584bf109c23451337f76d1ee5166e4dfa328bc508b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9208e4282e1097ceecb14584bf109c23451337f76d1ee5166e4dfa328bc508b2", kill_on_drop: false }`
[INFO] [stdout] 9208e4282e1097ceecb14584bf109c23451337f76d1ee5166e4dfa328bc508b2