[INFO] fetching crate back 0.1.1...
[INFO] checking back-0.1.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate back 0.1.1 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate back 0.1.1 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 back 0.1.1
[INFO] finished tweaking crates.io crate back 0.1.1
[INFO] tweaked toml for crates.io crate back 0.1.1 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate back 0.1.1 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]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded redox_users v0.4.3
[INFO] [stderr]   Downloaded thiserror-impl v1.0.38
[INFO] [stderr]   Downloaded proc-macro2 v1.0.49
[INFO] [stderr]   Downloaded quote v1.0.23
[INFO] [stderr]   Downloaded thiserror v1.0.38
[INFO] [stderr]   Downloaded unicode-ident v1.0.6
[INFO] [stderr]   Downloaded xdg v2.4.1
[INFO] [stderr]   Downloaded os_str_bytes v6.4.1
[INFO] [stderr]   Downloaded miniz_oxide v0.6.2
[INFO] [stderr]   Downloaded indexmap v1.9.2
[INFO] [stderr]   Downloaded clap v3.2.23
[INFO] [stderr]   Downloaded syn v1.0.107
[INFO] [stderr]   Downloaded windows_aarch64_gnullvm v0.42.0
[INFO] [stderr]   Downloaded windows_aarch64_msvc v0.42.0
[INFO] [stderr]   Downloaded windows_i686_gnu v0.42.0
[INFO] [stderr]   Downloaded windows_i686_msvc v0.42.0
[INFO] [stderr]   Downloaded windows_x86_64_gnu v0.42.0
[INFO] [stderr]   Downloaded windows_x86_64_msvc v0.42.0
[INFO] [stderr]   Downloaded libc v0.2.139
[INFO] [stderr]   Downloaded windows_x86_64_gnullvm v0.42.0
[INFO] [stderr]   Downloaded textwrap v0.16.0
[INFO] [stderr]   Downloaded flate2 v1.0.25
[INFO] [stderr]   Downloaded tar v0.4.38
[INFO] [stderr]   Downloaded getrandom v0.2.8
[INFO] [stderr]   Downloaded filetime v0.2.19
[INFO] [stderr]   Downloaded xattr v0.2.3
[INFO] [stderr]   Downloaded windows-sys v0.42.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 30d0f26e6eb4d2c14f18ff3f97a54e837ef9f859eb9be9a168f0ed0ac92eccd1
[INFO] running `Command { std: "docker" "start" "-a" "30d0f26e6eb4d2c14f18ff3f97a54e837ef9f859eb9be9a168f0ed0ac92eccd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "30d0f26e6eb4d2c14f18ff3f97a54e837ef9f859eb9be9a168f0ed0ac92eccd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30d0f26e6eb4d2c14f18ff3f97a54e837ef9f859eb9be9a168f0ed0ac92eccd1", kill_on_drop: false }`
[INFO] [stdout] 30d0f26e6eb4d2c14f18ff3f97a54e837ef9f859eb9be9a168f0ed0ac92eccd1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 7fa774e0b1acdcec7190697862e78343fe0ba7ae35d9ad96f992ada898f25faa
[INFO] running `Command { std: "docker" "start" "-a" "7fa774e0b1acdcec7190697862e78343fe0ba7ae35d9ad96f992ada898f25faa", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]     Checking hashbrown v0.12.3
[INFO] [stderr]    Compiling indexmap v1.9.2
[INFO] [stderr]     Checking os_str_bytes v6.4.1
[INFO] [stderr]     Checking miniz_oxide v0.6.2
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stderr]     Checking textwrap v0.16.0
[INFO] [stderr]     Checking clap_lex v0.2.4
[INFO] [stderr]     Checking flate2 v1.0.25
[INFO] [stderr]     Checking dirs-sys v0.3.7
[INFO] [stderr]     Checking xattr v0.2.3
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking filetime v0.2.19
[INFO] [stderr]     Checking dirs v4.0.0
[INFO] [stderr]     Checking xdg v2.4.1
[INFO] [stderr]     Checking tar v0.4.38
[INFO] [stderr]     Checking clap v3.2.23
[INFO] [stderr]     Checking back v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.98s
[INFO] running `Command { std: "docker" "inspect" "7fa774e0b1acdcec7190697862e78343fe0ba7ae35d9ad96f992ada898f25faa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7fa774e0b1acdcec7190697862e78343fe0ba7ae35d9ad96f992ada898f25faa", kill_on_drop: false }`
[INFO] [stdout] 7fa774e0b1acdcec7190697862e78343fe0ba7ae35d9ad96f992ada898f25faa
[INFO] checking back-0.1.1 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate back 0.1.1 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate back 0.1.1 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 back 0.1.1
[INFO] finished tweaking crates.io crate back 0.1.1
[INFO] tweaked toml for crates.io crate back 0.1.1 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate crates.io crate back 0.1.1 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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 964c4075276a9c35a1bbcfd1136a56d0cb06710e2e5f63c307b43a2ba411b6d1
[INFO] running `Command { std: "docker" "start" "-a" "964c4075276a9c35a1bbcfd1136a56d0cb06710e2e5f63c307b43a2ba411b6d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "964c4075276a9c35a1bbcfd1136a56d0cb06710e2e5f63c307b43a2ba411b6d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "964c4075276a9c35a1bbcfd1136a56d0cb06710e2e5f63c307b43a2ba411b6d1", kill_on_drop: false }`
[INFO] [stdout] 964c4075276a9c35a1bbcfd1136a56d0cb06710e2e5f63c307b43a2ba411b6d1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] ec6d160bc4ab8ca76873f0a6918c524573805fbffb7edc549b4fed7f7b5d46ff
[INFO] running `Command { std: "docker" "start" "-a" "ec6d160bc4ab8ca76873f0a6918c524573805fbffb7edc549b4fed7f7b5d46ff", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling indexmap v1.9.2
[INFO] [stderr]     Checking os_str_bytes v6.4.1
[INFO] [stderr]     Checking hashbrown v0.12.3
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stderr]     Checking miniz_oxide v0.6.2
[INFO] [stderr]     Checking textwrap v0.16.0
[INFO] [stderr]     Checking clap_lex v0.2.4
[INFO] [stderr]     Checking flate2 v1.0.25
[INFO] [stderr]     Checking dirs-sys v0.3.7
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking filetime v0.2.19
[INFO] [stderr]     Checking xattr v0.2.3
[INFO] [stderr]     Checking clap v3.2.23
[INFO] [stderr]     Checking dirs v4.0.0
[INFO] [stderr]     Checking tar v0.4.38
[INFO] [stderr]     Checking xdg v2.4.1
[INFO] [stderr]     Checking back v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.29s
[INFO] running `Command { std: "docker" "inspect" "ec6d160bc4ab8ca76873f0a6918c524573805fbffb7edc549b4fed7f7b5d46ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec6d160bc4ab8ca76873f0a6918c524573805fbffb7edc549b4fed7f7b5d46ff", kill_on_drop: false }`
[INFO] [stdout] ec6d160bc4ab8ca76873f0a6918c524573805fbffb7edc549b4fed7f7b5d46ff