[INFO] fetching crate iou 0.3.3...
[INFO] checking iou-0.3.3 against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] extracting crate iou 0.3.3 into /workspace/builds/worker-3-tc1/source
[INFO] started tweaking crates.io crate iou 0.3.3
[INFO] finished tweaking crates.io crate iou 0.3.3
[INFO] tweaked toml for crates.io crate iou 0.3.3 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate iou 0.3.3 on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "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" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 9 packages to latest compatible versions
[INFO] [stderr]       Adding bitflags v1.3.2 (available: v2.9.1)
[INFO] [stderr]       Adding nix v0.18.0 (available: v0.30.1)
[INFO] [stderr]       Adding semver v0.9.0 (available: v1.0.26)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded uring-sys v0.7.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b09ec12202048b4a08d2ef103ade539280a5b4bc93cc4697fa34a0b5d616c1dd
[INFO] running `Command { std: "docker" "start" "-a" "b09ec12202048b4a08d2ef103ade539280a5b4bc93cc4697fa34a0b5d616c1dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b09ec12202048b4a08d2ef103ade539280a5b4bc93cc4697fa34a0b5d616c1dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b09ec12202048b4a08d2ef103ade539280a5b4bc93cc4697fa34a0b5d616c1dd", kill_on_drop: false }`
[INFO] [stdout] b09ec12202048b4a08d2ef103ade539280a5b4bc93cc4697fa34a0b5d616c1dd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3585a7310b8b2b4f571875e3df689961a5f9b96cd6bfb8149cc58271f8eb98c3
[INFO] running `Command { std: "docker" "start" "-a" "3585a7310b8b2b4f571875e3df689961a5f9b96cd6bfb8149cc58271f8eb98c3", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]    Compiling cc v1.2.27
[INFO] [stderr]    Compiling nix v0.18.0
[INFO] [stderr]    Compiling uring-sys v0.7.4
[INFO] [stderr]     Checking iou v0.3.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a value that implements `Copy` does nothing
[INFO] [stdout]   --> tests/write.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |         drop(bufs); // hold bufs until after io completes
[INFO] [stdout]    |         ^^^^^----^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              argument has type `[IoSlice<'_>; 1]`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dropping_copy_types)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 43 -         drop(bufs); // hold bufs until after io completes
[INFO] [stdout] 43 +         let _ = bufs; // hold bufs until after io completes
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.54s
[INFO] running `Command { std: "docker" "inspect" "3585a7310b8b2b4f571875e3df689961a5f9b96cd6bfb8149cc58271f8eb98c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3585a7310b8b2b4f571875e3df689961a5f9b96cd6bfb8149cc58271f8eb98c3", kill_on_drop: false }`
[INFO] [stdout] 3585a7310b8b2b4f571875e3df689961a5f9b96cd6bfb8149cc58271f8eb98c3