[INFO] fetching crate poplar 0.1.0...
[INFO] testing poplar-0.1.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate poplar 0.1.0 into /workspace/builds/worker-21/source
[INFO] validating manifest of crates.io crate poplar 0.1.0 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate poplar 0.1.0
[INFO] finished tweaking crates.io crate poplar 0.1.0
[INFO] tweaked toml for crates.io crate poplar 0.1.0 written to /workspace/builds/worker-21/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rustc-std-workspace-core v1.0.0
[INFO] [stderr]   Downloaded rustc-std-workspace-alloc v1.0.0
[INFO] [stderr]   Downloaded compiler_builtins v0.1.72
[INFO] [stderr]   Downloaded pci_types v0.2.0
[INFO] [stderr]   Downloaded ptah v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f873f7cac58a20edfb3ac404e5110c18626e382b052e3521e05c6c8117dad78d
[INFO] running `Command { std: "docker" "start" "-a" "f873f7cac58a20edfb3ac404e5110c18626e382b052e3521e05c6c8117dad78d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f873f7cac58a20edfb3ac404e5110c18626e382b052e3521e05c6c8117dad78d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f873f7cac58a20edfb3ac404e5110c18626e382b052e3521e05c6c8117dad78d", kill_on_drop: false }`
[INFO] [stdout] f873f7cac58a20edfb3ac404e5110c18626e382b052e3521e05c6c8117dad78d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 484df1e6ad8efe1718616f6320ef0b0089daff6758fdc9b8c2f902b426eebea0
[INFO] running `Command { std: "docker" "start" "-a" "484df1e6ad8efe1718616f6320ef0b0089daff6758fdc9b8c2f902b426eebea0", kill_on_drop: false }`
[INFO] [stderr]    Compiling bit_field v0.10.1
[INFO] [stderr]    Compiling ptah v0.2.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/ptah-0.2.0/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(decl_macro, maybe_uninit_uninit_array, maybe_uninit_slice, never_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling pci_types 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 `ptah` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "484df1e6ad8efe1718616f6320ef0b0089daff6758fdc9b8c2f902b426eebea0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "484df1e6ad8efe1718616f6320ef0b0089daff6758fdc9b8c2f902b426eebea0", kill_on_drop: false }`
[INFO] [stdout] 484df1e6ad8efe1718616f6320ef0b0089daff6758fdc9b8c2f902b426eebea0