[INFO] fetching crate unix_exec_piper 0.1.4...
[INFO] checking unix_exec_piper-0.1.4 against try#c387b04bf028733cd561d62128c8a5eee4bc1458+rustflags=-Dtail_expr_drop_order for pr-130930
[INFO] extracting crate unix_exec_piper 0.1.4 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate unix_exec_piper 0.1.4 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 unix_exec_piper 0.1.4
[INFO] finished tweaking crates.io crate unix_exec_piper 0.1.4
[INFO] tweaked toml for crates.io crate unix_exec_piper 0.1.4 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate crates.io crate unix_exec_piper 0.1.4 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" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] b4c087a72a82f5af5ed165762191578ca16d461291be581e11bac6ab55d4a8e6
[INFO] running `Command { std: "docker" "start" "-a" "b4c087a72a82f5af5ed165762191578ca16d461291be581e11bac6ab55d4a8e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b4c087a72a82f5af5ed165762191578ca16d461291be581e11bac6ab55d4a8e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4c087a72a82f5af5ed165762191578ca16d461291be581e11bac6ab55d4a8e6", kill_on_drop: false }`
[INFO] [stdout] b4c087a72a82f5af5ed165762191578ca16d461291be581e11bac6ab55d4a8e6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 4c9576879bfbce7c68734ac17277afb07d3a0ae0880bfa0bb82c864292e2ccf6
[INFO] running `Command { std: "docker" "start" "-a" "4c9576879bfbce7c68734ac17277afb07d3a0ae0880bfa0bb82c864292e2ccf6", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.77
[INFO] [stderr]     Checking errno v0.2.6
[INFO] [stderr]     Checking unix_exec_piper v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:132:41
[INFO] [stdout]     |
[INFO] [stdout] 132 |             let exited_normally: bool = unsafe { libc::WIFEXITED(status_code) };
[INFO] [stdout]     |                                         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]    --> src/libc_util.rs:122:13
[INFO] [stdout]     |
[INFO] [stdout] 122 |         let input = String::from("Hello World!");
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:144:46
[INFO] [stdout]     |
[INFO] [stdout] 144 |                 let exit_code: libc::c_int = unsafe { libc::WEXITSTATUS(status_code) };
[INFO] [stdout]     |                                              ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:132:41
[INFO] [stdout]     |
[INFO] [stdout] 132 |             let exited_normally: bool = unsafe { libc::WIFEXITED(status_code) };
[INFO] [stdout]     |                                         ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/lib.rs:144:46
[INFO] [stdout]     |
[INFO] [stdout] 144 |                 let exit_code: libc::c_int = unsafe { libc::WEXITSTATUS(status_code) };
[INFO] [stdout]     |                                              ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.37s
[INFO] running `Command { std: "docker" "inspect" "4c9576879bfbce7c68734ac17277afb07d3a0ae0880bfa0bb82c864292e2ccf6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c9576879bfbce7c68734ac17277afb07d3a0ae0880bfa0bb82c864292e2ccf6", kill_on_drop: false }`
[INFO] [stdout] 4c9576879bfbce7c68734ac17277afb07d3a0ae0880bfa0bb82c864292e2ccf6