[INFO] cloning repository https://github.com/EkardNT/marching-buffers
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/EkardNT/marching-buffers" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEkardNT%2Fmarching-buffers", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEkardNT%2Fmarching-buffers'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7cb55839af0b34ec798ebc2836254d00c845d8f7
[INFO] checking EkardNT/marching-buffers against try#8de4b308b608cded0ebccf658a0fc719bce87d4e for pr-89056
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEkardNT%2Fmarching-buffers" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/EkardNT/marching-buffers on toolchain 8de4b308b608cded0ebccf658a0fc719bce87d4e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/EkardNT/marching-buffers
[INFO] finished tweaking git repo https://github.com/EkardNT/marching-buffers
[INFO] tweaked toml for git repo https://github.com/EkardNT/marching-buffers written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/EkardNT/marching-buffers already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d19e6376d22dd82d0bf9c7b0d17b497afb9850249320fe04b243a8650b52697e
[INFO] running `Command { std: "docker" "start" "-a" "d19e6376d22dd82d0bf9c7b0d17b497afb9850249320fe04b243a8650b52697e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d19e6376d22dd82d0bf9c7b0d17b497afb9850249320fe04b243a8650b52697e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d19e6376d22dd82d0bf9c7b0d17b497afb9850249320fe04b243a8650b52697e", kill_on_drop: false }`
[INFO] [stdout] d19e6376d22dd82d0bf9c7b0d17b497afb9850249320fe04b243a8650b52697e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3ad89a5143485e5bb1099406a7df836b7c0a2b3d4b91bb77c868790a3ced4e41
[INFO] running `Command { std: "docker" "start" "-a" "3ad89a5143485e5bb1099406a7df836b7c0a2b3d4b91bb77c868790a3ced4e41", kill_on_drop: false }`
[INFO] [stderr]     Checking marching-buffer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:255:13
[INFO] [stdout]     |
[INFO] [stdout] 255 | ...   &mut copy_buffer[..copied_this_round].copy_from_slice(&reader.access().as_slice()[bytes_copied .. (bytes_copied + copied_this_round)...
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 255 |             let _ = &mut copy_buffer[..copied_this_round].copy_from_slice(&reader.access().as_slice()[bytes_copied .. (bytes_copied + copied_this_round)]);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:255:13
[INFO] [stdout]     |
[INFO] [stdout] 255 | ...   &mut copy_buffer[..copied_this_round].copy_from_slice(&reader.access().as_slice()[bytes_copied .. (bytes_copied + copied_this_round)...
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 255 |             let _ = &mut copy_buffer[..copied_this_round].copy_from_slice(&reader.access().as_slice()[bytes_copied .. (bytes_copied + copied_this_round)]);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "3ad89a5143485e5bb1099406a7df836b7c0a2b3d4b91bb77c868790a3ced4e41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ad89a5143485e5bb1099406a7df836b7c0a2b3d4b91bb77c868790a3ced4e41", kill_on_drop: false }`
[INFO] [stdout] 3ad89a5143485e5bb1099406a7df836b7c0a2b3d4b91bb77c868790a3ced4e41