[INFO] crate cow_vec_item 0.5.0 is already in cache
[INFO] checking cow_vec_item-0.5.0 against try#6024cfef3a82f9a7688f07054f1650081bad3af5 for pr-74130
[INFO] extracting crate cow_vec_item 0.5.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate cow_vec_item 0.5.0 on toolchain 6024cfef3a82f9a7688f07054f1650081bad3af5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cow_vec_item 0.5.0
[INFO] finished tweaking crates.io crate cow_vec_item 0.5.0
[INFO] tweaked toml for crates.io crate cow_vec_item 0.5.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 224a150d6e5f15a393f4c1b62adff80ead6e23f60a2fa66f6d4eb6c97ab53faa
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "224a150d6e5f15a393f4c1b62adff80ead6e23f60a2fa66f6d4eb6c97ab53faa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "224a150d6e5f15a393f4c1b62adff80ead6e23f60a2fa66f6d4eb6c97ab53faa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "224a150d6e5f15a393f4c1b62adff80ead6e23f60a2fa66f6d4eb6c97ab53faa", kill_on_drop: false }`
[INFO] [stdout] 224a150d6e5f15a393f4c1b62adff80ead6e23f60a2fa66f6d4eb6c97ab53faa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+6024cfef3a82f9a7688f07054f1650081bad3af5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd45c65e2002387e69e036cbaa3b7a575433546004b28c2b9954fcaa52be2a04
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "fd45c65e2002387e69e036cbaa3b7a575433546004b28c2b9954fcaa52be2a04", kill_on_drop: false }`
[INFO] [stderr]     Checking cow_vec_item v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/lib.rs:232:19
[INFO] [stdout]     |
[INFO] [stdout] 232 |         *unsafe { (&mut *self.bad_wrapper_use_detector) } = WrapperState::Dead;
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:2:9
[INFO] [stdout]     |
[INFO] [stdout] 2   | #![deny(warnings)]
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     = note: `#[deny(unused_parens)]` implied by `#[deny(warnings)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/lib.rs:546:22
[INFO] [stdout]     |
[INFO] [stdout] 546 |         if *unsafe { (&*self.bad_wrapper_use_detector) } != WrapperState::Dead {
[INFO] [stdout]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/lib.rs:581:22
[INFO] [stdout]     |
[INFO] [stdout] 581 |         if *unsafe { (&*self.bad_wrapper_use_detector) } != WrapperState::Dead {
[INFO] [stdout]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/lib.rs:232:19
[INFO] [stdout]     |
[INFO] [stdout] 232 |         *unsafe { (&mut *self.bad_wrapper_use_detector) } = WrapperState::Dead;
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:2:9
[INFO] [stdout]     |
[INFO] [stdout] 2   | #![deny(warnings)]
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     = note: `#[deny(unused_parens)]` implied by `#[deny(warnings)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/lib.rs:546:22
[INFO] [stdout]     |
[INFO] [stdout] 546 |         if *unsafe { (&*self.bad_wrapper_use_detector) } != WrapperState::Dead {
[INFO] [stdout]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/lib.rs:581:22
[INFO] [stdout]     |
[INFO] [stdout] 581 |         if *unsafe { (&*self.bad_wrapper_use_detector) } != WrapperState::Dead {
[INFO] [stdout]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cow_vec_item`.
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "fd45c65e2002387e69e036cbaa3b7a575433546004b28c2b9954fcaa52be2a04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd45c65e2002387e69e036cbaa3b7a575433546004b28c2b9954fcaa52be2a04", kill_on_drop: false }`
[INFO] [stdout] fd45c65e2002387e69e036cbaa3b7a575433546004b28c2b9954fcaa52be2a04