[INFO] fetching crate bumpslab 0.2.0...
[INFO] checking bumpslab-0.2.0 against try#54cf65b8d066c082e536455049b95943cf30378f for pr-151920
[INFO] extracting crate bumpslab 0.2.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate bumpslab 0.2.0
[INFO] finished tweaking crates.io crate bumpslab 0.2.0
[INFO] tweaked toml for crates.io crate bumpslab 0.2.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate bumpslab 0.2.0 on toolchain 54cf65b8d066c082e536455049b95943cf30378f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+54cf65b8d066c082e536455049b95943cf30378f" "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" "+54cf65b8d066c082e536455049b95943cf30378f" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 15 packages to latest compatible versions
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.10.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+54cf65b8d066c082e536455049b95943cf30378f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+54cf65b8d066c082e536455049b95943cf30378f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] af672e3f846f28b80a077e90c079a3ad14fbbb43519c4d7388614ef9c88ac20b
[INFO] running `Command { std: "docker" "start" "-a" "af672e3f846f28b80a077e90c079a3ad14fbbb43519c4d7388614ef9c88ac20b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "af672e3f846f28b80a077e90c079a3ad14fbbb43519c4d7388614ef9c88ac20b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af672e3f846f28b80a077e90c079a3ad14fbbb43519c4d7388614ef9c88ac20b", kill_on_drop: false }`
[INFO] [stdout] af672e3f846f28b80a077e90c079a3ad14fbbb43519c4d7388614ef9c88ac20b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+54cf65b8d066c082e536455049b95943cf30378f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4d86ef33b998e08e6f867eca7e682648721d7628b14053becd694c759c334ac4
[INFO] running `Command { std: "docker" "start" "-a" "4d86ef33b998e08e6f867eca7e682648721d7628b14053becd694c759c334ac4", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.182
[INFO] [stderr]    Compiling zerocopy v0.8.39
[INFO] [stderr]     Checking bumpalo v3.19.1
[INFO] [stderr]     Checking bumpslab v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: not automatically applying `DerefMut` through union field to target that might have `Drop` glue
[INFO] [stdout]   --> src/lib.rs:89:24
[INFO] [stdout]    |
[INFO] [stdout] 89 |         unsafe { &mut *self.value.get_mut() }
[INFO] [stdout]    |                        ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: writing to this reference calls the destructor for the old value
[INFO] [stdout]    = help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bumpslab` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "4d86ef33b998e08e6f867eca7e682648721d7628b14053becd694c759c334ac4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d86ef33b998e08e6f867eca7e682648721d7628b14053becd694c759c334ac4", kill_on_drop: false }`
[INFO] [stdout] 4d86ef33b998e08e6f867eca7e682648721d7628b14053becd694c759c334ac4
