[INFO] fetching crate esp8266-wifi-serial 0.1.3...
[INFO] checking esp8266-wifi-serial-0.1.3 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate esp8266-wifi-serial 0.1.3 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate esp8266-wifi-serial 0.1.3 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 esp8266-wifi-serial 0.1.3
[INFO] finished tweaking crates.io crate esp8266-wifi-serial 0.1.3
[INFO] tweaked toml for crates.io crate esp8266-wifi-serial 0.1.3 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7014e13d5becc920d4bea3cd87942c8a13d359bf" "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 49 packages to latest compatible versions
[INFO] [stderr]       Adding bitflags v1.3.2 (available: v2.6.0)
[INFO] [stderr]       Adding embedded-hal v0.2.7 (available: v1.0.0)
[INFO] [stderr]       Adding hash32 v0.2.1 (available: v0.3.1)
[INFO] [stderr]       Adding heapless v0.7.17 (available: v0.8.0)
[INFO] [stderr]       Adding memchr v2.3.4 (available: v2.7.4)
[INFO] [stderr]       Adding nb v0.1.3 (available: v1.1.0)
[INFO] [stderr]       Adding nix v0.26.4 (available: v0.29.0)
[INFO] [stderr]       Adding no-std-net v0.5.0 (available: v0.6.0)
[INFO] [stderr]       Adding nom v6.2.2 (available: v7.1.3)
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] ca83a71cacb52ea221beedbb580a1cfb7efa227386c253e4bc403e142b4e1778
[INFO] running `Command { std: "docker" "start" "-a" "ca83a71cacb52ea221beedbb580a1cfb7efa227386c253e4bc403e142b4e1778", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ca83a71cacb52ea221beedbb580a1cfb7efa227386c253e4bc403e142b4e1778", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca83a71cacb52ea221beedbb580a1cfb7efa227386c253e4bc403e142b4e1778", kill_on_drop: false }`
[INFO] [stdout] ca83a71cacb52ea221beedbb580a1cfb7efa227386c253e4bc403e142b4e1778
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 658054a794427f8e1fd0d1b1dd185a643c1cc2d52f8d9821970391f17688f2d3
[INFO] running `Command { std: "docker" "start" "-a" "658054a794427f8e1fd0d1b1dd185a643c1cc2d52f8d9821970391f17688f2d3", kill_on_drop: false }`
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling nom v6.2.2
[INFO] [stderr]    Compiling heapless v0.7.17
[INFO] [stderr]    Compiling serde v1.0.210
[INFO] [stderr]     Checking hash32 v0.2.1
[INFO] [stderr]     Checking nix v0.26.4
[INFO] [stderr]     Checking lock_api v0.4.12
[INFO] [stderr]     Checking unescaper v0.1.5
[INFO] [stderr]     Checking no-stdout v0.1.0
[INFO] [stderr]     Checking simple-clock v0.1.0
[INFO] [stderr]     Checking no-std-net v0.5.0
[INFO] [stderr]     Checking assert_matches v1.5.0
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]     Checking libudev v0.3.0
[INFO] [stderr]     Checking serialport v4.5.1
[INFO] [stderr]     Checking esp8266-wifi-serial v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `guard` is never read
[INFO] [stdout]   --> tests/common/mod.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 40 | struct SerialPortWrapper {
[INFO] [stdout]    |        ----------------- field in this struct
[INFO] [stdout] 41 |     guard: Rc<MutexGuard<'static, ()>>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `SerialPortWrapper` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[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 8.45s
[INFO] running `Command { std: "docker" "inspect" "658054a794427f8e1fd0d1b1dd185a643c1cc2d52f8d9821970391f17688f2d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "658054a794427f8e1fd0d1b1dd185a643c1cc2d52f8d9821970391f17688f2d3", kill_on_drop: false }`
[INFO] [stdout] 658054a794427f8e1fd0d1b1dd185a643c1cc2d52f8d9821970391f17688f2d3