[INFO] cloning repository https://github.com/mielpeeters/whister
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mielpeeters/whister" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmielpeeters%2Fwhister", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmielpeeters%2Fwhister'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d711201c756af8ecfafcf943667a3a3f075868fd
[INFO] checking mielpeeters/whister against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmielpeeters%2Fwhister" "/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/mielpeeters/whister 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/mielpeeters/whister
[INFO] finished tweaking git repo https://github.com/mielpeeters/whister
[INFO] tweaked toml for git repo https://github.com/mielpeeters/whister written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/mielpeeters/whister 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 serde v1.0.175
[INFO] [stderr]   Downloaded portable-atomic v1.3.3
[INFO] [stderr]   Downloaded serde_derive v1.0.175
[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] 5a6139ba367c94d7486a81447a1fc7f949047eb19b1760ba7fa03b43e8b64fed
[INFO] running `Command { std: "docker" "start" "-a" "5a6139ba367c94d7486a81447a1fc7f949047eb19b1760ba7fa03b43e8b64fed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5a6139ba367c94d7486a81447a1fc7f949047eb19b1760ba7fa03b43e8b64fed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a6139ba367c94d7486a81447a1fc7f949047eb19b1760ba7fa03b43e8b64fed", kill_on_drop: false }`
[INFO] [stdout] 5a6139ba367c94d7486a81447a1fc7f949047eb19b1760ba7fa03b43e8b64fed
[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] 76402dc67ce64bde5b75417d62de2f892ef4e6daf93dfb6b43c801e32b0b91dd
[INFO] running `Command { std: "docker" "start" "-a" "76402dc67ce64bde5b75417d62de2f892ef4e6daf93dfb6b43c801e32b0b91dd", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.175
[INFO] [stderr]    Compiling serde_derive v1.0.175
[INFO] [stderr]    Compiling portable-atomic v1.3.3
[INFO] [stderr]     Checking option-ext v0.2.0
[INFO] [stderr]     Checking memchr v2.6.4
[INFO] [stderr]     Checking getrandom v0.2.9
[INFO] [stderr]     Checking unicode-width v0.1.10
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking dirs-sys v0.4.1
[INFO] [stderr]     Checking console v0.15.7
[INFO] [stderr]     Checking either v1.8.1
[INFO] [stderr]     Checking number_prefix v0.4.0
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking termion v2.0.1
[INFO] [stderr]     Checking dirs v5.0.1
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking text_io v0.1.12
[INFO] [stderr]     Checking itertools v0.11.0
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking csv-core v0.1.11
[INFO] [stderr]     Checking indicatif v0.17.5
[INFO] [stderr]     Checking csv v1.3.0
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking whister v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.90s
[INFO] running `Command { std: "docker" "inspect" "76402dc67ce64bde5b75417d62de2f892ef4e6daf93dfb6b43c801e32b0b91dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76402dc67ce64bde5b75417d62de2f892ef4e6daf93dfb6b43c801e32b0b91dd", kill_on_drop: false }`
[INFO] [stdout] 76402dc67ce64bde5b75417d62de2f892ef4e6daf93dfb6b43c801e32b0b91dd
[INFO] checking mielpeeters/whister against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmielpeeters%2Fwhister" "/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/mielpeeters/whister 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/mielpeeters/whister
[INFO] finished tweaking git repo https://github.com/mielpeeters/whister
[INFO] tweaked toml for git repo https://github.com/mielpeeters/whister written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/mielpeeters/whister 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] 525e486193c04594fe5b9c0eca81ff8fa704b276992acbca7d18725430f03fd8
[INFO] running `Command { std: "docker" "start" "-a" "525e486193c04594fe5b9c0eca81ff8fa704b276992acbca7d18725430f03fd8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "525e486193c04594fe5b9c0eca81ff8fa704b276992acbca7d18725430f03fd8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "525e486193c04594fe5b9c0eca81ff8fa704b276992acbca7d18725430f03fd8", kill_on_drop: false }`
[INFO] [stdout] 525e486193c04594fe5b9c0eca81ff8fa704b276992acbca7d18725430f03fd8
[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] 4e5aa6b56c33b26abec01e2412cdbbebc53fd32d9f3cd2b2ab043dc3a635d5e6
[INFO] running `Command { std: "docker" "start" "-a" "4e5aa6b56c33b26abec01e2412cdbbebc53fd32d9f3cd2b2ab043dc3a635d5e6", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.175
[INFO] [stderr]    Compiling portable-atomic v1.3.3
[INFO] [stderr]    Compiling serde_derive v1.0.175
[INFO] [stderr]     Checking option-ext v0.2.0
[INFO] [stderr]     Checking unicode-width v0.1.10
[INFO] [stderr]     Checking getrandom v0.2.9
[INFO] [stderr]     Checking memchr v2.6.4
[INFO] [stderr]     Checking number_prefix v0.4.0
[INFO] [stderr]     Checking dirs-sys v0.4.1
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking console v0.15.7
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking either v1.8.1
[INFO] [stderr]     Checking termion v2.0.1
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking itertools v0.11.0
[INFO] [stderr]     Checking dirs v5.0.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking text_io v0.1.12
[INFO] [stderr]     Checking csv-core v0.1.11
[INFO] [stderr]     Checking indicatif v0.17.5
[INFO] [stderr]     Checking csv v1.3.0
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking whister v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.67s
[INFO] running `Command { std: "docker" "inspect" "4e5aa6b56c33b26abec01e2412cdbbebc53fd32d9f3cd2b2ab043dc3a635d5e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e5aa6b56c33b26abec01e2412cdbbebc53fd32d9f3cd2b2ab043dc3a635d5e6", kill_on_drop: false }`
[INFO] [stdout] 4e5aa6b56c33b26abec01e2412cdbbebc53fd32d9f3cd2b2ab043dc3a635d5e6