[INFO] cloning repository https://github.com/xiaguan/rust_io_uring_examples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xiaguan/rust_io_uring_examples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxiaguan%2Frust_io_uring_examples", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxiaguan%2Frust_io_uring_examples'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8cc7c093997bac30e2550670bcadbf6ae7aaa15d
[INFO] checking xiaguan/rust_io_uring_examples against master#03eb45452305f2d52348279d0caa5fc1f12c438d for pr-138176
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxiaguan%2Frust_io_uring_examples" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
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[INFO] validating manifest of git repo https://github.com/xiaguan/rust_io_uring_examples on toolchain 03eb45452305f2d52348279d0caa5fc1f12c438d
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[INFO] crate git repo https://github.com/xiaguan/rust_io_uring_examples already has a lockfile, it will not be regenerated
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[INFO] [stderr]     Updating crates.io index
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+03eb45452305f2d52348279d0caa5fc1f12c438d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aaf26ac7287b81f18fb3eb849684bf11ed72015e68acf72e278d1d661c6dd46e
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[INFO] running `Command { std: "docker" "inspect" "aaf26ac7287b81f18fb3eb849684bf11ed72015e68acf72e278d1d661c6dd46e", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+03eb45452305f2d52348279d0caa5fc1f12c438d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] [stderr]     Checking memchr v2.7.4
[INFO] [stderr]     Checking regex-syntax v0.8.5
[INFO] [stderr]    Compiling libc v0.2.154
[INFO] [stderr]     Checking utf8parse v0.2.2
[INFO] [stderr]    Compiling io-uring v0.6.4
[INFO] [stderr]     Checking is_terminal_polyfill v1.70.1
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[INFO] [stderr]     Checking rust_io_uring_examples v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `written`
[INFO] [stdout]   --> src/main.rs:24:13
[INFO] [stdout]    |
[INFO] [stdout] 24 |         let written = libc::syscall(libc::SYS_write, 1, c_msg.as_ptr(), len);
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_written`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `written`
[INFO] [stdout]   --> src/main.rs:24:13
[INFO] [stdout]    |
[INFO] [stdout] 24 |         let written = libc::syscall(libc::SYS_write, 1, c_msg.as_ptr(), len);
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_written`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/libc_cat_io_uring.rs:457:9
[INFO] [stdout]     |
[INFO] [stdout] 457 |     let mut tail = unsafe { *sring.tail };
[INFO] [stdout]     |         ----^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/libc_cat_io_uring.rs:457:9
[INFO] [stdout]     |
[INFO] [stdout] 457 |     let mut tail = unsafe { *sring.tail };
[INFO] [stdout]     |         ----^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.44s
[INFO] running `Command { std: "docker" "inspect" "14a71094181a4749611b45f80a35c0ab3a50b0ea4c97e2eb8b1bd82a514463da", kill_on_drop: false }`
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[INFO] [stdout] 14a71094181a4749611b45f80a35c0ab3a50b0ea4c97e2eb8b1bd82a514463da