[INFO] fetching crate kitten 0.5.0...
[INFO] checking kitten-0.5.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate kitten 0.5.0 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate kitten 0.5.0 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 crates.io crate kitten 0.5.0
[INFO] finished tweaking crates.io crate kitten 0.5.0
[INFO] tweaked toml for crates.io crate kitten 0.5.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 59 packages
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding object v0.32.2 (latest: v0.34.0)
[INFO] [stderr]       Adding redox_syscall v0.4.1 (latest: v0.5.1)
[INFO] [stderr]       Adding wasi v0.11.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0)
[INFO] [stderr]       Adding windows-sys v0.48.0 (latest: v0.52.0)
[INFO] [stderr]       Adding windows-targets v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_msvc v0.48.5 (latest: v0.52.4)
[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] 48a8bf009d5eb4f653d2eae55e789d921d509493444aeb065868339cf6f9f223
[INFO] running `Command { std: "docker" "start" "-a" "48a8bf009d5eb4f653d2eae55e789d921d509493444aeb065868339cf6f9f223", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "48a8bf009d5eb4f653d2eae55e789d921d509493444aeb065868339cf6f9f223", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48a8bf009d5eb4f653d2eae55e789d921d509493444aeb065868339cf6f9f223", kill_on_drop: false }`
[INFO] [stdout] 48a8bf009d5eb4f653d2eae55e789d921d509493444aeb065868339cf6f9f223
[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] ce9ff23703113b6278ceaacd757c86d0fa8ba4fb0f6fbacf1c78014a1c383638
[INFO] running `Command { std: "docker" "start" "-a" "ce9ff23703113b6278ceaacd757c86d0fa8ba4fb0f6fbacf1c78014a1c383638", kill_on_drop: false }`
[INFO] [stderr]     Checking smallvec v1.13.2
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking signal-hook-registry v1.4.1
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking parking_lot_core v0.9.9
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]     Checking tokio v1.37.0
[INFO] [stderr]     Checking kitten v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.82s
[INFO] running `Command { std: "docker" "inspect" "ce9ff23703113b6278ceaacd757c86d0fa8ba4fb0f6fbacf1c78014a1c383638", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce9ff23703113b6278ceaacd757c86d0fa8ba4fb0f6fbacf1c78014a1c383638", kill_on_drop: false }`
[INFO] [stdout] ce9ff23703113b6278ceaacd757c86d0fa8ba4fb0f6fbacf1c78014a1c383638
[INFO] checking kitten-0.5.0 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate kitten 0.5.0 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate kitten 0.5.0 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 crates.io crate kitten 0.5.0
[INFO] finished tweaking crates.io crate kitten 0.5.0
[INFO] tweaked toml for crates.io crate kitten 0.5.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 59 packages
[INFO] [stderr]       Adding bitflags v1.3.2 (latest: v2.5.0)
[INFO] [stderr]       Adding object v0.32.2 (latest: v0.34.0)
[INFO] [stderr]       Adding redox_syscall v0.4.1 (latest: v0.5.1)
[INFO] [stderr]       Adding wasi v0.11.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0)
[INFO] [stderr]       Adding windows-sys v0.48.0 (latest: v0.52.0)
[INFO] [stderr]       Adding windows-targets v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_aarch64_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_i686_msvc v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnu v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_gnullvm v0.48.5 (latest: v0.52.4)
[INFO] [stderr]       Adding windows_x86_64_msvc v0.48.5 (latest: v0.52.4)
[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-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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 926f42498569c9a1e8d40070545697a9e987ef5920e0acf8cbde70d28cf442a6
[INFO] running `Command { std: "docker" "start" "-a" "926f42498569c9a1e8d40070545697a9e987ef5920e0acf8cbde70d28cf442a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "926f42498569c9a1e8d40070545697a9e987ef5920e0acf8cbde70d28cf442a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "926f42498569c9a1e8d40070545697a9e987ef5920e0acf8cbde70d28cf442a6", kill_on_drop: false }`
[INFO] [stdout] 926f42498569c9a1e8d40070545697a9e987ef5920e0acf8cbde70d28cf442a6
[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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e108e1439f0b99f421bc27474346e2282f7e13a78bfb48b1661b5313ae32c472
[INFO] running `Command { std: "docker" "start" "-a" "e108e1439f0b99f421bc27474346e2282f7e13a78bfb48b1661b5313ae32c472", kill_on_drop: false }`
[INFO] [stderr]     Checking smallvec v1.13.2
[INFO] [stderr]     Checking signal-hook-registry v1.4.1
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking parking_lot_core v0.9.9
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]     Checking tokio v1.37.0
[INFO] [stderr]     Checking kitten v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.18s
[INFO] running `Command { std: "docker" "inspect" "e108e1439f0b99f421bc27474346e2282f7e13a78bfb48b1661b5313ae32c472", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e108e1439f0b99f421bc27474346e2282f7e13a78bfb48b1661b5313ae32c472", kill_on_drop: false }`
[INFO] [stdout] e108e1439f0b99f421bc27474346e2282f7e13a78bfb48b1661b5313ae32c472