[INFO] fetching crate skip-list 0.1.3...
[INFO] building skip-list-0.1.3 against try#4987e9d4227139400384ab59296ffee3b0fb1183 for pr-146237-2
[INFO] extracting crate skip-list 0.1.3 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate skip-list 0.1.3
[INFO] finished tweaking crates.io crate skip-list 0.1.3
[INFO] tweaked toml for crates.io crate skip-list 0.1.3 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate skip-list 0.1.3 on toolchain 4987e9d4227139400384ab59296ffee3b0fb1183
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 14 packages to latest compatible versions
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7d2b8627042f34cc3ca3c1f87d2f0bb0ae77e1ea374f373bb4d8525a5454852a
[INFO] running `Command { std: "docker" "start" "-a" "7d2b8627042f34cc3ca3c1f87d2f0bb0ae77e1ea374f373bb4d8525a5454852a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7d2b8627042f34cc3ca3c1f87d2f0bb0ae77e1ea374f373bb4d8525a5454852a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d2b8627042f34cc3ca3c1f87d2f0bb0ae77e1ea374f373bb4d8525a5454852a", kill_on_drop: false }`
[INFO] [stdout] 7d2b8627042f34cc3ca3c1f87d2f0bb0ae77e1ea374f373bb4d8525a5454852a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 00538f3f801f347ac0742755ff992fa59383f50a681c17607656c5c17eaf1f53
[INFO] running `Command { std: "docker" "start" "-a" "00538f3f801f347ac0742755ff992fa59383f50a681c17607656c5c17eaf1f53", kill_on_drop: false }`
[INFO] [stderr]    Compiling skip-list v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stdout]    --> src/lib.rs:498:13
[INFO] [stdout]     |
[INFO] [stdout] 498 |             Box::from_raw(self.head.as_ptr());
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 498 |             let _ = Box::from_raw(self.head.as_ptr());
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "00538f3f801f347ac0742755ff992fa59383f50a681c17607656c5c17eaf1f53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00538f3f801f347ac0742755ff992fa59383f50a681c17607656c5c17eaf1f53", kill_on_drop: false }`
[INFO] [stdout] 00538f3f801f347ac0742755ff992fa59383f50a681c17607656c5c17eaf1f53
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3b4e113efa8391343f27e04d80bb0bbd423a404532dff5373d30afe31504711d
[INFO] running `Command { std: "docker" "start" "-a" "3b4e113efa8391343f27e04d80bb0bbd423a404532dff5373d30afe31504711d", kill_on_drop: false }`
[INFO] [stderr]    Compiling skip-list v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stdout]    --> src/lib.rs:498:13
[INFO] [stdout]     |
[INFO] [stdout] 498 |             Box::from_raw(self.head.as_ptr());
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 498 |             let _ = Box::from_raw(self.head.as_ptr());
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stdout]    --> src/lib.rs:498:13
[INFO] [stdout]     |
[INFO] [stdout] 498 |             Box::from_raw(self.head.as_ptr());
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 498 |             let _ = Box::from_raw(self.head.as_ptr());
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.67s
[INFO] running `Command { std: "docker" "inspect" "3b4e113efa8391343f27e04d80bb0bbd423a404532dff5373d30afe31504711d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b4e113efa8391343f27e04d80bb0bbd423a404532dff5373d30afe31504711d", kill_on_drop: false }`
[INFO] [stdout] 3b4e113efa8391343f27e04d80bb0bbd423a404532dff5373d30afe31504711d