[INFO] fetching crate mfrc522 0.7.0...
[INFO] checking mfrc522-0.7.0 against try#7014e13d5becc920d4bea3cd87942c8a13d359bf+rustflags=-Dtail_expr_drop_order for pr-129864
[INFO] extracting crate mfrc522 0.7.0 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate mfrc522 0.7.0 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 mfrc522 0.7.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate mfrc522 0.7.0
[INFO] tweaked toml for crates.io crate mfrc522 0.7.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate mfrc522 0.7.0 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] 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] bb57373bcc942defa685d30f57488f4f0898dac88da8d9ff7aa711dfceff7971
[INFO] running `Command { std: "docker" "start" "-a" "bb57373bcc942defa685d30f57488f4f0898dac88da8d9ff7aa711dfceff7971", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb57373bcc942defa685d30f57488f4f0898dac88da8d9ff7aa711dfceff7971", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb57373bcc942defa685d30f57488f4f0898dac88da8d9ff7aa711dfceff7971", kill_on_drop: false }`
[INFO] [stdout] bb57373bcc942defa685d30f57488f4f0898dac88da8d9ff7aa711dfceff7971
[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] 27ce6a284788a0a9119744e7f8f5b3f69fc23e6a38c8cc327c8e60e1ef5d0ddf
[INFO] running `Command { std: "docker" "start" "-a" "27ce6a284788a0a9119744e7f8f5b3f69fc23e6a38c8cc327c8e60e1ef5d0ddf", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.152
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling memoffset v0.7.1
[INFO] [stderr]    Compiling semver v1.0.21
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]     Checking nb v1.1.0
[INFO] [stderr]     Checking embedded-hal v1.0.0
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]     Checking hash32 v0.2.1
[INFO] [stderr]    Compiling embedded-hal-bus v0.1.0
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking num-complex v0.3.1
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking critical-section v1.1.2
[INFO] [stderr]     Checking lock_api v0.4.11
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking embedded-hal v0.2.7
[INFO] [stderr]     Checking embedded-hal-nb v1.0.0
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling heapless v0.7.17
[INFO] [stderr]     Checking num v0.3.1
[INFO] [stderr]     Checking embedded-time v0.12.1
[INFO] [stderr]     Checking mfrc522 v0.7.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking nix v0.26.4
[INFO] [stderr]     Checking nix v0.27.1
[INFO] [stderr]     Checking nix v0.23.2
[INFO] [stderr]     Checking embedded-hal-mock v0.10.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.56
[INFO] [stderr]     Checking gpio-cdev v0.6.0
[INFO] [stderr]     Checking thiserror v1.0.56
[INFO] [stderr]     Checking unescaper v0.1.3
[INFO] [stderr]     Checking i2cdev v0.6.0
[INFO] [stderr]     Checking spidev v0.6.0
[INFO] [stderr]     Checking serialport v4.3.0
[INFO] [stderr]     Checking sysfs_gpio v0.6.1
[INFO] [stderr]     Checking linux-embedded-hal v0.4.0
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.13s
[INFO] running `Command { std: "docker" "inspect" "27ce6a284788a0a9119744e7f8f5b3f69fc23e6a38c8cc327c8e60e1ef5d0ddf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27ce6a284788a0a9119744e7f8f5b3f69fc23e6a38c8cc327c8e60e1ef5d0ddf", kill_on_drop: false }`
[INFO] [stdout] 27ce6a284788a0a9119744e7f8f5b3f69fc23e6a38c8cc327c8e60e1ef5d0ddf