[INFO] fetching crate smallbox2 0.1.0...
[INFO] testing smallbox2-0.1.0 against try#dec9417b8611e34e787a3e4c37686b5131f9e5c5 for pr-154210-2
[INFO] extracting crate smallbox2 0.1.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate smallbox2 0.1.0
[INFO] finished tweaking crates.io crate smallbox2 0.1.0
[INFO] tweaked toml for crates.io crate smallbox2 0.1.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate smallbox2 0.1.0 on toolchain dec9417b8611e34e787a3e4c37686b5131f9e5c5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "fetch" "--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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 91e1c4c40b9c703b619c50e620de8280c159800aade5442299e25679c98a1a35
[INFO] running `Command { std: "docker" "start" "-a" "91e1c4c40b9c703b619c50e620de8280c159800aade5442299e25679c98a1a35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "91e1c4c40b9c703b619c50e620de8280c159800aade5442299e25679c98a1a35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "91e1c4c40b9c703b619c50e620de8280c159800aade5442299e25679c98a1a35", kill_on_drop: false }`
[INFO] [stdout] 91e1c4c40b9c703b619c50e620de8280c159800aade5442299e25679c98a1a35
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c22657b3547caad299f5568ad93fa50aa63d8a456ad8ffb9bd3929759d29f3b5
[INFO] running `Command { std: "docker" "start" "-a" "c22657b3547caad299f5568ad93fa50aa63d8a456ad8ffb9bd3929759d29f3b5", kill_on_drop: false }`
[INFO] [stderr]    Compiling smallbox2 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: calling this function with a null pointer is undefined behavior, even if the result of the function is unused
[INFO] [stdout]   --> src/smallbox.rs:51:22
[INFO] [stdout]    |
[INFO] [stdout] 51 |             unsafe { core::slice::from_raw_parts_mut(core::ptr::null_mut::<u8>(), 0) as *mut [u8] };
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^---------------------------^^^^
[INFO] [stdout]    |                                                      |
[INFO] [stdout]    |                                                      null pointer originates from here
[INFO] [stdout]    |
[INFO] [stdout]    = help: for more information, visit <https://doc.rust-lang.org/std/ptr/index.html> and <https://doc.rust-lang.org/reference/behavior-considered-undefined.html>
[INFO] [stdout]    = note: `#[deny(invalid_null_arguments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `smallbox2` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "c22657b3547caad299f5568ad93fa50aa63d8a456ad8ffb9bd3929759d29f3b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c22657b3547caad299f5568ad93fa50aa63d8a456ad8ffb9bd3929759d29f3b5", kill_on_drop: false }`
[INFO] [stdout] c22657b3547caad299f5568ad93fa50aa63d8a456ad8ffb9bd3929759d29f3b5