[INFO] fetching crate esp8266-wifi-serial 0.1.3...
[INFO] checking esp8266-wifi-serial-0.1.3 against try#cac44d9528e3bbbdaa1537d187bd489ccc5de18c for pr-91141
[INFO] extracting crate esp8266-wifi-serial 0.1.3 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate esp8266-wifi-serial 0.1.3 on toolchain cac44d9528e3bbbdaa1537d187bd489ccc5de18c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "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-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded no-std-net v0.5.0
[INFO] [stderr]   Downloaded no-stdout v0.1.0
[INFO] [stderr]   Downloaded simple-clock v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] cb6d845d76acf092b4f4fcb198fee46f63c10c451b0ed0288e41ce977dca2f9a
[INFO] running `Command { std: "docker" "start" "-a" "cb6d845d76acf092b4f4fcb198fee46f63c10c451b0ed0288e41ce977dca2f9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cb6d845d76acf092b4f4fcb198fee46f63c10c451b0ed0288e41ce977dca2f9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cb6d845d76acf092b4f4fcb198fee46f63c10c451b0ed0288e41ce977dca2f9a", kill_on_drop: false }`
[INFO] [stdout] cb6d845d76acf092b4f4fcb198fee46f63c10c451b0ed0288e41ce977dca2f9a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 73a76afccc22c16cdc1bacbec06433b5a064272a7ba7c90cfd5578f0bcf86f71
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "73a76afccc22c16cdc1bacbec06433b5a064272a7ba7c90cfd5578f0bcf86f71", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling pkg-config v0.3.22
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling heapless v0.7.8
[INFO] [stderr]     Checking nb v1.0.0
[INFO] [stderr]    Compiling nix v0.16.1
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking simple-clock v0.1.0
[INFO] [stderr]     Checking no-stdout v0.1.0
[INFO] [stderr]     Checking no-std-net v0.5.0
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]     Checking assert_matches v1.5.0
[INFO] [stderr]     Checking hash32 v0.2.1
[INFO] [stderr]     Checking spin v0.9.2
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking embedded-hal v0.2.6
[INFO] [stderr]    Compiling nom v6.2.1
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]     Checking libudev v0.2.0
[INFO] [stderr]     Checking serialport v4.0.1
[INFO] [stderr]     Checking esp8266-wifi-serial v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `guard`
[INFO] [stdout]   --> tests/common/mod.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 |     guard: Rc<MutexGuard<'static, ()>>,
[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 [unoptimized + debuginfo] target(s) in 36.31s
[INFO] running `Command { std: "docker" "inspect" "73a76afccc22c16cdc1bacbec06433b5a064272a7ba7c90cfd5578f0bcf86f71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73a76afccc22c16cdc1bacbec06433b5a064272a7ba7c90cfd5578f0bcf86f71", kill_on_drop: false }`
[INFO] [stdout] 73a76afccc22c16cdc1bacbec06433b5a064272a7ba7c90cfd5578f0bcf86f71