[INFO] cloning repository https://github.com/lutzer/midi_clock
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lutzer/midi_clock" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flutzer%2Fmidi_clock", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flutzer%2Fmidi_clock'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c5fed2cbc4e65bf0e272519b7ee2ba8a511519b3
[INFO] testing lutzer/midi_clock against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flutzer%2Fmidi_clock" "/workspace/builds/worker-15/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-15/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lutzer/midi_clock on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-15/source/.cargo/config
[INFO] started tweaking git repo https://github.com/lutzer/midi_clock
[INFO] finished tweaking git repo https://github.com/lutzer/midi_clock
[INFO] tweaked toml for git repo https://github.com/lutzer/midi_clock written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate git repo https://github.com/lutzer/midi_clock already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 016740bc8fd1c0a6753094955d90e72723e79293f0e8f971f776062e43035a5d
[INFO] running `Command { std: "docker" "start" "-a" "016740bc8fd1c0a6753094955d90e72723e79293f0e8f971f776062e43035a5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "016740bc8fd1c0a6753094955d90e72723e79293f0e8f971f776062e43035a5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "016740bc8fd1c0a6753094955d90e72723e79293f0e8f971f776062e43035a5d", kill_on_drop: false }`
[INFO] [stdout] 016740bc8fd1c0a6753094955d90e72723e79293f0e8f971f776062e43035a5d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd9d6f29ff90a7499b2f62e868fdcf46c1af8736dae69873602e5fc680f78b69
[INFO] running `Command { std: "docker" "start" "-a" "fd9d6f29ff90a7499b2f62e868fdcf46c1af8736dae69873602e5fc680f78b69", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]    Compiling nb v1.0.0
[INFO] [stderr]    Compiling stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling semver v1.0.3
[INFO] [stderr]    Compiling cortex-m v0.7.3
[INFO] [stderr]    Compiling vcell v0.1.3
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling cortex-m v0.6.7
[INFO] [stderr]    Compiling az v1.1.2
[INFO] [stderr]    Compiling cortex-m-rt v0.6.15
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling bitfield v0.13.2
[INFO] [stderr]    Compiling stm32f1 v0.11.0
[INFO] [stderr]    Compiling heapless v0.7.3
[INFO] [stderr]    Compiling r0 v0.2.2
[INFO] [stderr]    Compiling display-interface v0.4.1
[INFO] [stderr]    Compiling byte-slice-cast v0.3.5
[INFO] [stderr]    Compiling micromath v1.1.1
[INFO] [stderr]    Compiling linked_list_allocator v0.8.11
[INFO] [stderr]    Compiling panic-halt v0.2.0
[INFO] [stderr]    Compiling numtoa v0.2.4
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]    Compiling float-cmp v0.8.0
[INFO] [stderr]    Compiling nb v0.1.3
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/linked_list_allocator-0.8.11/src/lib.rs:1:41
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "const_mut_refs", feature(const_mut_refs))]
[INFO] [stdout]   |                                         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling volatile-register v0.2.0
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `linked_list_allocator` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "fd9d6f29ff90a7499b2f62e868fdcf46c1af8736dae69873602e5fc680f78b69", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd9d6f29ff90a7499b2f62e868fdcf46c1af8736dae69873602e5fc680f78b69", kill_on_drop: false }`
[INFO] [stdout] fd9d6f29ff90a7499b2f62e868fdcf46c1af8736dae69873602e5fc680f78b69