[INFO] fetching crate signal-hook 0.3.17...
[INFO] checking signal-hook-0.3.17 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate signal-hook 0.3.17 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate signal-hook 0.3.17 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 signal-hook 0.3.17
[INFO] finished tweaking crates.io crate signal-hook 0.3.17
[INFO] tweaked toml for crates.io crate signal-hook 0.3.17 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate crates.io crate signal-hook 0.3.17 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serial_test_derive v0.7.0
[INFO] [stderr]   Downloaded serial_test v0.7.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] dfb959eec95d2dc8ae3c148f050fe09d123c2b1b6e177037dbcb9e5cac272d76
[INFO] running `Command { std: "docker" "start" "-a" "dfb959eec95d2dc8ae3c148f050fe09d123c2b1b6e177037dbcb9e5cac272d76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dfb959eec95d2dc8ae3c148f050fe09d123c2b1b6e177037dbcb9e5cac272d76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfb959eec95d2dc8ae3c148f050fe09d123c2b1b6e177037dbcb9e5cac272d76", kill_on_drop: false }`
[INFO] [stdout] dfb959eec95d2dc8ae3c148f050fe09d123c2b1b6e177037dbcb9e5cac272d76
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 34b13d71f34d41fb8b42970c6efb5f8a4bbe90828c0a40d8c98e1b806745718f
[INFO] running `Command { std: "docker" "start" "-a" "34b13d71f34d41fb8b42970c6efb5f8a4bbe90828c0a40d8c98e1b806745718f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling syn v1.0.96
[INFO] [stderr]    Compiling parking_lot_core v0.9.3
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling signal-hook v0.3.17 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/iterator/backend.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | use libc::{self, c_int};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/iterator/mod.rs:68:12
[INFO] [stdout]    |
[INFO] [stdout] 68 | use libc::{self, c_int};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/low_level/pipe.rs:80:12
[INFO] [stdout]    |
[INFO] [stdout] 80 | use libc::{self, c_int};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling serial_test_derive v0.7.0
[INFO] [stderr]     Checking serial_test v0.7.0
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/iterator/backend.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | use libc::{self, c_int};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/iterator/mod.rs:68:12
[INFO] [stdout]    |
[INFO] [stdout] 68 | use libc::{self, c_int};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.93s
[INFO] running `Command { std: "docker" "inspect" "34b13d71f34d41fb8b42970c6efb5f8a4bbe90828c0a40d8c98e1b806745718f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34b13d71f34d41fb8b42970c6efb5f8a4bbe90828c0a40d8c98e1b806745718f", kill_on_drop: false }`
[INFO] [stdout] 34b13d71f34d41fb8b42970c6efb5f8a4bbe90828c0a40d8c98e1b806745718f
[INFO] checking signal-hook-0.3.17 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate signal-hook 0.3.17 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate signal-hook 0.3.17 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 signal-hook 0.3.17
[INFO] finished tweaking crates.io crate signal-hook 0.3.17
[INFO] tweaked toml for crates.io crate signal-hook 0.3.17 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate crates.io crate signal-hook 0.3.17 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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 7ee796be5eb871109cbaa193a804581c147b6eb8f6067ff44ea1d9bc26596135
[INFO] running `Command { std: "docker" "start" "-a" "7ee796be5eb871109cbaa193a804581c147b6eb8f6067ff44ea1d9bc26596135", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7ee796be5eb871109cbaa193a804581c147b6eb8f6067ff44ea1d9bc26596135", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ee796be5eb871109cbaa193a804581c147b6eb8f6067ff44ea1d9bc26596135", kill_on_drop: false }`
[INFO] [stdout] 7ee796be5eb871109cbaa193a804581c147b6eb8f6067ff44ea1d9bc26596135
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] f1ae1f836539500a2d7877890cae187218f74c8eb34a26a331c85547059f78f2
[INFO] running `Command { std: "docker" "start" "-a" "f1ae1f836539500a2d7877890cae187218f74c8eb34a26a331c85547059f78f2", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling syn v1.0.96
[INFO] [stderr]    Compiling parking_lot_core v0.9.3
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling signal-hook v0.3.17 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/iterator/backend.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | use libc::{self, c_int};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/iterator/mod.rs:68:12
[INFO] [stdout]    |
[INFO] [stdout] 68 | use libc::{self, c_int};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/low_level/pipe.rs:80:12
[INFO] [stdout]    |
[INFO] [stdout] 80 | use libc::{self, c_int};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling serial_test_derive v0.7.0
[INFO] [stderr]     Checking serial_test v0.7.0
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/iterator/backend.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | use libc::{self, c_int};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `libc` is imported redundantly
[INFO] [stdout]   --> src/iterator/mod.rs:68:12
[INFO] [stdout]    |
[INFO] [stdout] 68 | use libc::{self, c_int};
[INFO] [stdout]    |            ^^^^ the item `libc` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.40s
[INFO] running `Command { std: "docker" "inspect" "f1ae1f836539500a2d7877890cae187218f74c8eb34a26a331c85547059f78f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1ae1f836539500a2d7877890cae187218f74c8eb34a26a331c85547059f78f2", kill_on_drop: false }`
[INFO] [stdout] f1ae1f836539500a2d7877890cae187218f74c8eb34a26a331c85547059f78f2