[INFO] fetching crate merfolk_backend_serialport 0.1.0...
[INFO] testing merfolk_backend_serialport-0.1.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate merfolk_backend_serialport 0.1.0 into /workspace/builds/worker-81/source
[INFO] validating manifest of crates.io crate merfolk_backend_serialport 0.1.0 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate merfolk_backend_serialport 0.1.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate merfolk_backend_serialport 0.1.0
[INFO] tweaked toml for crates.io crate merfolk_backend_serialport 0.1.0 written to /workspace/builds/worker-81/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mach v0.1.2
[INFO] [stderr]   Downloaded CoreFoundation-sys v0.1.4
[INFO] [stderr]   Downloaded libudev v0.2.0
[INFO] [stderr]   Downloaded ron v0.6.5
[INFO] [stderr]   Downloaded IOKit-sys v0.1.5
[INFO] [stderr]   Downloaded serialport v4.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bbbeab298c78d8a9e48fe1bfae11f3db924291ee5b3a805b598340cf2c000c89
[INFO] running `Command { std: "docker" "start" "-a" "bbbeab298c78d8a9e48fe1bfae11f3db924291ee5b3a805b598340cf2c000c89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bbbeab298c78d8a9e48fe1bfae11f3db924291ee5b3a805b598340cf2c000c89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbbeab298c78d8a9e48fe1bfae11f3db924291ee5b3a805b598340cf2c000c89", kill_on_drop: false }`
[INFO] [stdout] bbbeab298c78d8a9e48fe1bfae11f3db924291ee5b3a805b598340cf2c000c89
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 606093b28778c3f8bace77776445975717d52494b7fa585aa5b1487839af6b49
[INFO] running `Command { std: "docker" "start" "-a" "606093b28778c3f8bace77776445975717d52494b7fa585aa5b1487839af6b49", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling nix v0.16.1
[INFO] [stderr]    Compiling anyhow v1.0.43
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling spin v0.7.1
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling tokio v1.11.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling libudev v0.2.0
[INFO] [stderr]    Compiling darling_core v0.12.4
[INFO] [stderr]    Compiling serialport v4.0.1
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling thiserror-impl v1.0.29
[INFO] [stderr]    Compiling darling_macro v0.12.4
[INFO] [stderr]    Compiling thiserror v1.0.29
[INFO] [stderr]    Compiling darling v0.12.4
[INFO] [stderr]    Compiling derive_builder_core v0.10.2
[INFO] [stderr]    Compiling derive_builder_macro v0.10.2
[INFO] [stderr]    Compiling derive_builder v0.10.2
[INFO] [stderr]    Compiling merfolk v0.1.4
[INFO] [stderr]    Compiling ron v0.6.5
[INFO] [stderr]    Compiling merfolk_backend_serialport v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 28.99s
[INFO] running `Command { std: "docker" "inspect" "606093b28778c3f8bace77776445975717d52494b7fa585aa5b1487839af6b49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "606093b28778c3f8bace77776445975717d52494b7fa585aa5b1487839af6b49", kill_on_drop: false }`
[INFO] [stdout] 606093b28778c3f8bace77776445975717d52494b7fa585aa5b1487839af6b49
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-81/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fc0ce29343f8fb2972bda25fc22be6073a4fe59850d10a9053d730a0b850a6c4
[INFO] running `Command { std: "docker" "start" "-a" "fc0ce29343f8fb2972bda25fc22be6073a4fe59850d10a9053d730a0b850a6c4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling merfolk_backend_serialport v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `merfolk_frontend_register`
[INFO] [stdout]    --> test/tests.rs:153:25
[INFO] [stdout]     |
[INFO] [stdout] 153 |   let register_caller = merfolk_frontend_register::Register::builder().build().unwrap();
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^ use of undeclared crate or module `merfolk_frontend_register`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `merfolk_frontend_register`
[INFO] [stdout]    --> test/tests.rs:154:27
[INFO] [stdout]     |
[INFO] [stdout] 154 |   let register_receiver = merfolk_frontend_register::Register::builder().build().unwrap();
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^ use of undeclared crate or module `merfolk_frontend_register`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `merfolk_backend_serialport` due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "fc0ce29343f8fb2972bda25fc22be6073a4fe59850d10a9053d730a0b850a6c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc0ce29343f8fb2972bda25fc22be6073a4fe59850d10a9053d730a0b850a6c4", kill_on_drop: false }`
[INFO] [stdout] fc0ce29343f8fb2972bda25fc22be6073a4fe59850d10a9053d730a0b850a6c4