[INFO] cloning repository https://github.com/xigh/buffer-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xigh/buffer-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxigh%2Fbuffer-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxigh%2Fbuffer-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6c69c423ac2a2c2a212a4c5c2f604557da6ae7ef
[INFO] checking xigh/buffer-rs against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxigh%2Fbuffer-rs" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/xigh/buffer-rs
[INFO] finished tweaking git repo https://github.com/xigh/buffer-rs
[INFO] tweaked toml for git repo https://github.com/xigh/buffer-rs written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/xigh/buffer-rs on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/xigh/buffer-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f049d41da6b4f20b586ea6883fc22014bac148fa519de9b9de97d38cfb4119b8
[INFO] running `Command { std: "docker" "start" "-a" "f049d41da6b4f20b586ea6883fc22014bac148fa519de9b9de97d38cfb4119b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f049d41da6b4f20b586ea6883fc22014bac148fa519de9b9de97d38cfb4119b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f049d41da6b4f20b586ea6883fc22014bac148fa519de9b9de97d38cfb4119b8", kill_on_drop: false }`
[INFO] [stdout] f049d41da6b4f20b586ea6883fc22014bac148fa519de9b9de97d38cfb4119b8
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4c26fbdf9a6f5e5212877a409c678e7d258487a92bf44808a5844f306339fdc1
[INFO] running `Command { std: "docker" "start" "-a" "4c26fbdf9a6f5e5212877a409c678e7d258487a92bf44808a5844f306339fdc1", kill_on_drop: false }`
[INFO] [stderr]     Checking buffer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
[INFO] [stdout]  --> src/mutref.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let mut_ptr = const_ptr as *mut T;
[INFO] [stdout]   |                   ------------------- casting happened here
[INFO] [stdout] 4 |     &mut *mut_ptr
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
[INFO] [stdout]   = note: `#[deny(invalid_reference_casting)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
[INFO] [stdout]  --> src/mutref.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let mut_ptr = const_ptr as *mut T;
[INFO] [stdout]   |                   ------------------- casting happened here
[INFO] [stdout] 4 |     &mut *mut_ptr
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
[INFO] [stdout]   = note: `#[deny(invalid_reference_casting)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `buffer` (lib test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `buffer` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "4c26fbdf9a6f5e5212877a409c678e7d258487a92bf44808a5844f306339fdc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c26fbdf9a6f5e5212877a409c678e7d258487a92bf44808a5844f306339fdc1", kill_on_drop: false }`
[INFO] [stdout] 4c26fbdf9a6f5e5212877a409c678e7d258487a92bf44808a5844f306339fdc1