[INFO] fetching crate tidy-tree 0.1.0...
[INFO] testing tidy-tree-0.1.0 against 1.76.0 for beta-1.77-1
[INFO] extracting crate tidy-tree 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate tidy-tree 0.1.0 on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tidy-tree 0.1.0
[INFO] finished tweaking crates.io crate tidy-tree 0.1.0
[INFO] tweaked toml for crates.io crate tidy-tree 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tinyset v0.4.15
[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" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9a5a1188df0706bd8c5762641c8416e86d9e6116b6c168f1307ad3667004e26c
[INFO] running `Command { std: "docker" "start" "-a" "9a5a1188df0706bd8c5762641c8416e86d9e6116b6c168f1307ad3667004e26c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9a5a1188df0706bd8c5762641c8416e86d9e6116b6c168f1307ad3667004e26c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a5a1188df0706bd8c5762641c8416e86d9e6116b6c168f1307ad3667004e26c", kill_on_drop: false }`
[INFO] [stdout] 9a5a1188df0706bd8c5762641c8416e86d9e6116b6c168f1307ad3667004e26c
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "+1.76.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f80059c86d2494d63dcb5b854e2a7a34077c5405bc359bbdf5e08e5fd7e6db15
[INFO] running `Command { std: "docker" "start" "-a" "f80059c86d2494d63dcb5b854e2a7a34077c5405bc359bbdf5e08e5fd7e6db15", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-complex v0.4.5
[INFO] [stderr]    Compiling getrandom v0.2.12
[INFO] [stderr]    Compiling num-bigint v0.4.4
[INFO] [stderr]    Compiling num-iter v0.1.44
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling num-rational v0.4.1
[INFO] [stderr]    Compiling tinyset v0.4.15
[INFO] [stderr]    Compiling num v0.4.1
[INFO] [stderr]    Compiling tidy-tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.79s
[INFO] running `Command { std: "docker" "inspect" "f80059c86d2494d63dcb5b854e2a7a34077c5405bc359bbdf5e08e5fd7e6db15", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f80059c86d2494d63dcb5b854e2a7a34077c5405bc359bbdf5e08e5fd7e6db15", kill_on_drop: false }`
[INFO] [stdout] f80059c86d2494d63dcb5b854e2a7a34077c5405bc359bbdf5e08e5fd7e6db15
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "+1.76.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2c1c185d6dd54c726a02de36604ae53dbd0bff287950301cea639acc871179db
[INFO] running `Command { std: "docker" "start" "-a" "2c1c185d6dd54c726a02de36604ae53dbd0bff287950301cea639acc871179db", kill_on_drop: false }`
[INFO] [stderr]    Compiling tidy-tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> tests/layout_bench.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tidy-tree` (test "layout_bench") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: function `prepare_tree` is never used
[INFO] [stdout]   --> tests/gen.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 | pub fn prepare_tree(rng: &mut StdRng) -> (Box<Node>, Vec<NonNull<Node>>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `insert_new_to_tree` is never used
[INFO] [stdout]   --> tests/gen.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub fn insert_new_to_tree(rng: &mut StdRng, num: usize, nodes: &mut Vec<NonNull<Node>>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "2c1c185d6dd54c726a02de36604ae53dbd0bff287950301cea639acc871179db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c1c185d6dd54c726a02de36604ae53dbd0bff287950301cea639acc871179db", kill_on_drop: false }`
[INFO] [stdout] 2c1c185d6dd54c726a02de36604ae53dbd0bff287950301cea639acc871179db
