[INFO] fetching crate rust_io 0.6.0...
[INFO] checking rust_io-0.6.0 against try#c387b04bf028733cd561d62128c8a5eee4bc1458+rustflags=-Dtail_expr_drop_order for pr-130930
[INFO] extracting crate rust_io 0.6.0 into /workspace/builds/worker-3-tc2/source
[INFO] validating manifest of crates.io crate rust_io 0.6.0 on toolchain c387b04bf028733cd561d62128c8a5eee4bc1458
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rust_io 0.6.0
[INFO] finished tweaking crates.io crate rust_io 0.6.0
[INFO] tweaked toml for crates.io crate rust_io 0.6.0 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 81 packages to latest compatible versions
[INFO] [stderr]       Adding async-channel v1.9.0 (available: v2.3.1)
[INFO] [stderr]       Adding event-listener v2.5.3 (available: v5.3.1)
[INFO] [stderr]       Adding linux-raw-sys v0.4.14 (available: v0.6.5)
[INFO] [stderr]       Adding wasi v0.11.0+wasi-snapshot-preview1 (available: v0.13.2+wasi-0.2.1)
[INFO] [stderr]       Adding windows-sys v0.52.0 (available: v0.59.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 45322154213e8789f4f962063cae31ffd3c198c168eb1bcedca6177b370d8af9
[INFO] running `Command { std: "docker" "start" "-a" "45322154213e8789f4f962063cae31ffd3c198c168eb1bcedca6177b370d8af9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "45322154213e8789f4f962063cae31ffd3c198c168eb1bcedca6177b370d8af9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45322154213e8789f4f962063cae31ffd3c198c168eb1bcedca6177b370d8af9", kill_on_drop: false }`
[INFO] [stdout] 45322154213e8789f4f962063cae31ffd3c198c168eb1bcedca6177b370d8af9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -Dtail_expr_drop_order" "-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c2e331859b73779babe5c49d9421a7344eb55642a1b709a6aa869ade55daede6
[INFO] running `Command { std: "docker" "start" "-a" "c2e331859b73779babe5c49d9421a7344eb55642a1b709a6aa869ade55daede6", kill_on_drop: false }`
[INFO] [stderr]     Checking parking v2.2.1
[INFO] [stderr]     Checking futures-io v0.3.30
[INFO] [stderr]     Checking fastrand v2.1.1
[INFO] [stderr]    Compiling libc v0.2.159
[INFO] [stderr]    Compiling rustix v0.38.37
[INFO] [stderr]     Checking tracing-core v0.1.32
[INFO] [stderr]     Checking linux-raw-sys v0.4.14
[INFO] [stderr]     Checking async-task v4.7.1
[INFO] [stderr]     Checking futures-sink v0.3.30
[INFO] [stderr]     Checking value-bag v1.9.0
[INFO] [stderr]     Checking event-listener v2.5.3
[INFO] [stderr]     Checking concurrent-queue v2.5.0
[INFO] [stderr]    Compiling syn v2.0.79
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]     Checking event-listener v5.3.1
[INFO] [stderr]     Checking async-channel v1.9.0
[INFO] [stderr]     Checking futures-lite v2.3.0
[INFO] [stderr]     Checking piper v0.2.4
[INFO] [stderr]     Checking log v0.4.22
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]     Checking event-listener-strategy v0.5.2
[INFO] [stderr]     Checking async-lock v3.4.0
[INFO] [stderr]     Checking async-channel v2.3.1
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]     Checking blocking v1.6.1
[INFO] [stderr]     Checking async-executor v1.13.1
[INFO] [stderr]     Checking getrandom v0.2.15
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]     Checking zerocopy v0.7.35
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]     Checking ppv-lite86 v0.2.20
[INFO] [stderr]     Checking polling v3.7.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking async-io v2.3.4
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking async-global-executor v2.4.1
[INFO] [stderr]     Checking async-std v1.13.0
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stderr]     Checking rust_io v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Rng` and `thread_rng`
[INFO] [stdout]  --> src/lib.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | use rand::{Rng, thread_rng};
[INFO] [stdout]   |            ^^^  ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/lib.rs:782:29
[INFO] [stdout]     |
[INFO] [stdout] 782 |                 .map_error(|t| String::from("Error B"));
[INFO] [stdout]     |                             ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/lib.rs:930:29
[INFO] [stdout]     |
[INFO] [stdout] 930 |                 .map_error(|t| String::from("Error B"))
[INFO] [stdout]     |                             ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.62s
[INFO] running `Command { std: "docker" "inspect" "c2e331859b73779babe5c49d9421a7344eb55642a1b709a6aa869ade55daede6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c2e331859b73779babe5c49d9421a7344eb55642a1b709a6aa869ade55daede6", kill_on_drop: false }`
[INFO] [stdout] c2e331859b73779babe5c49d9421a7344eb55642a1b709a6aa869ade55daede6