[INFO] cloning repository https://github.com/kurtbuilds/user-backtrace
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kurtbuilds/user-backtrace" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkurtbuilds%2Fuser-backtrace", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkurtbuilds%2Fuser-backtrace'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 38c1833d22abbf2042869a6acbb5caeb98698c63
[INFO] checking kurtbuilds/user-backtrace against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkurtbuilds%2Fuser-backtrace" "/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/kurtbuilds/user-backtrace 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/kurtbuilds/user-backtrace
[INFO] finished tweaking git repo https://github.com/kurtbuilds/user-backtrace
[INFO] tweaked toml for git repo https://github.com/kurtbuilds/user-backtrace written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kurtbuilds/user-backtrace 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 cc v1.0.77
[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] 43d16908af728a633481dd547ec1bceb4662825595dbb997671fe026d90f2b2b
[INFO] running `Command { std: "docker" "start" "-a" "43d16908af728a633481dd547ec1bceb4662825595dbb997671fe026d90f2b2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "43d16908af728a633481dd547ec1bceb4662825595dbb997671fe026d90f2b2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43d16908af728a633481dd547ec1bceb4662825595dbb997671fe026d90f2b2b", kill_on_drop: false }`
[INFO] [stdout] 43d16908af728a633481dd547ec1bceb4662825595dbb997671fe026d90f2b2b
[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] a1c782b6e6deb91f8475fb4a9c4d0db416b269916d8985fb4d99a96a7ecbf2a3
[INFO] running `Command { std: "docker" "start" "-a" "a1c782b6e6deb91f8475fb4a9c4d0db416b269916d8985fb4d99a96a7ecbf2a3", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling libc v0.2.137
[INFO] [stderr]    Compiling cc v1.0.77
[INFO] [stderr]     Checking gimli v0.26.2
[INFO] [stderr]    Compiling anyhow v1.0.66
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]     Checking miniz_oxide v0.5.4
[INFO] [stderr]     Checking object v0.29.0
[INFO] [stderr]    Compiling backtrace v0.3.66
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]     Checking user-backtrace v0.2.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.79s
[INFO] running `Command { std: "docker" "inspect" "a1c782b6e6deb91f8475fb4a9c4d0db416b269916d8985fb4d99a96a7ecbf2a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1c782b6e6deb91f8475fb4a9c4d0db416b269916d8985fb4d99a96a7ecbf2a3", kill_on_drop: false }`
[INFO] [stdout] a1c782b6e6deb91f8475fb4a9c4d0db416b269916d8985fb4d99a96a7ecbf2a3
[INFO] checking kurtbuilds/user-backtrace against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkurtbuilds%2Fuser-backtrace" "/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/kurtbuilds/user-backtrace 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/kurtbuilds/user-backtrace
[INFO] finished tweaking git repo https://github.com/kurtbuilds/user-backtrace
[INFO] tweaked toml for git repo https://github.com/kurtbuilds/user-backtrace written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/kurtbuilds/user-backtrace 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] 3807e00ae4b2109d24e1643b1d7c0c5f4e24a4b5a6e32ec426343c89b8aeb026
[INFO] running `Command { std: "docker" "start" "-a" "3807e00ae4b2109d24e1643b1d7c0c5f4e24a4b5a6e32ec426343c89b8aeb026", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3807e00ae4b2109d24e1643b1d7c0c5f4e24a4b5a6e32ec426343c89b8aeb026", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3807e00ae4b2109d24e1643b1d7c0c5f4e24a4b5a6e32ec426343c89b8aeb026", kill_on_drop: false }`
[INFO] [stdout] 3807e00ae4b2109d24e1643b1d7c0c5f4e24a4b5a6e32ec426343c89b8aeb026
[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] 46c9b88516fbc0f91ef5751e4a23beba7cf5fbf0e8c933186759be679624caa4
[INFO] running `Command { std: "docker" "start" "-a" "46c9b88516fbc0f91ef5751e4a23beba7cf5fbf0e8c933186759be679624caa4", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling libc v0.2.137
[INFO] [stderr]    Compiling cc v1.0.77
[INFO] [stderr]     Checking gimli v0.26.2
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]    Compiling anyhow v1.0.66
[INFO] [stderr]     Checking miniz_oxide v0.5.4
[INFO] [stderr]     Checking object v0.29.0
[INFO] [stderr]    Compiling backtrace v0.3.66
[INFO] [stderr]     Checking addr2line v0.17.0
[INFO] [stderr]     Checking user-backtrace v0.2.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.28s
[INFO] running `Command { std: "docker" "inspect" "46c9b88516fbc0f91ef5751e4a23beba7cf5fbf0e8c933186759be679624caa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46c9b88516fbc0f91ef5751e4a23beba7cf5fbf0e8c933186759be679624caa4", kill_on_drop: false }`
[INFO] [stdout] 46c9b88516fbc0f91ef5751e4a23beba7cf5fbf0e8c933186759be679624caa4