[INFO] fetching crate topcat 0.1.0...
[INFO] checking topcat-0.1.0 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate topcat 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate topcat 0.1.0 on toolchain 7014e13d5becc920d4bea3cd87942c8a13d359bf
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate topcat 0.1.0
[INFO] finished tweaking crates.io crate topcat 0.1.0
[INFO] tweaked toml for crates.io crate topcat 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate topcat 0.1.0 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" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 44be450a9cbbaea788081e95cf9d49b5ec9ab0f7b7d0bba1c1d3874c24a21cd1
[INFO] running `Command { std: "docker" "start" "-a" "44be450a9cbbaea788081e95cf9d49b5ec9ab0f7b7d0bba1c1d3874c24a21cd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "44be450a9cbbaea788081e95cf9d49b5ec9ab0f7b7d0bba1c1d3874c24a21cd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44be450a9cbbaea788081e95cf9d49b5ec9ab0f7b7d0bba1c1d3874c24a21cd1", kill_on_drop: false }`
[INFO] [stdout] 44be450a9cbbaea788081e95cf9d49b5ec9ab0f7b7d0bba1c1d3874c24a21cd1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d05d03107206b8de225195a86200fd4506d2ac49b372e98e7b12b198baf8869c
[INFO] running `Command { std: "docker" "start" "-a" "d05d03107206b8de225195a86200fd4506d2ac49b372e98e7b12b198baf8869c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling unicode-segmentation v1.11.0
[INFO] [stderr]    Compiling rustix v0.38.31
[INFO] [stderr]     Checking aho-corasick v1.1.2
[INFO] [stderr]     Checking indexmap v2.1.0
[INFO] [stderr]     Checking anstream v0.6.13
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking petgraph v0.6.4
[INFO] [stderr]     Checking regex-automata v0.4.6
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking tempfile v3.10.1
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]     Checking regex v1.10.3
[INFO] [stderr]     Checking env_filter v0.1.0
[INFO] [stderr]     Checking env_logger v0.11.3
[INFO] [stderr]     Checking structopt v0.3.26
[INFO] [stderr]     Checking topcat v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/fs.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl MockFileSystem {
[INFO] [stdout]    | ------------------- associated function in this implementation
[INFO] [stdout] 21 |     pub fn new(files: Vec<String>) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/fs.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl MockFileSystem {
[INFO] [stdout]    | ------------------- associated function in this implementation
[INFO] [stdout] 21 |     pub fn new(files: Vec<String>) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.00s
[INFO] running `Command { std: "docker" "inspect" "d05d03107206b8de225195a86200fd4506d2ac49b372e98e7b12b198baf8869c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d05d03107206b8de225195a86200fd4506d2ac49b372e98e7b12b198baf8869c", kill_on_drop: false }`
[INFO] [stdout] d05d03107206b8de225195a86200fd4506d2ac49b372e98e7b12b198baf8869c