[INFO] fetching crate dep-obj 0.27.1...
[INFO] testing dep-obj-0.27.1 against 1.55.0 for beta-1.56-1
[INFO] extracting crate dep-obj 0.27.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate dep-obj 0.27.1 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate dep-obj 0.27.1
[INFO] finished tweaking crates.io crate dep-obj 0.27.1
[INFO] tweaked toml for crates.io crate dep-obj 0.27.1 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate dep-obj 0.27.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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 macro-attr-2018 v1.1.1
[INFO] [stderr]   Downloaded panicking v0.0.1
[INFO] [stderr]   Downloaded phantom-type v0.3.1
[INFO] [stderr]   Downloaded generics v0.3.2
[INFO] [stderr]   Downloaded dyn-context v0.10.7
[INFO] [stderr]   Downloaded components-arena v2.1.5
[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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7ac4ec81020292b377a8a29db3f217dc1ec12da07fca762c0704c848fa8fd20a
[INFO] running `Command { std: "docker" "start" "-a" "7ac4ec81020292b377a8a29db3f217dc1ec12da07fca762c0704c848fa8fd20a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7ac4ec81020292b377a8a29db3f217dc1ec12da07fca762c0704c848fa8fd20a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ac4ec81020292b377a8a29db3f217dc1ec12da07fca762c0704c848fa8fd20a", kill_on_drop: false }`
[INFO] [stdout] 7ac4ec81020292b377a8a29db3f217dc1ec12da07fca762c0704c848fa8fd20a
[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=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" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 48715e59b3118971c9386b5b20bf011dafcc5a17a50b86673b4e73f43a8ed2ab
[INFO] running `Command { std: "docker" "start" "-a" "48715e59b3118971c9386b5b20bf011dafcc5a17a50b86673b4e73f43a8ed2ab", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling generics v0.3.2
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling panicking v0.0.1
[INFO] [stderr]    Compiling paste v1.0.5
[INFO] [stderr]    Compiling macro-attr-2018 v1.1.1
[INFO] [stderr]    Compiling downcast-rs v1.2.0
[INFO] [stderr]    Compiling dyn-clone v1.0.4
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.4.0
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling rand v0.8.4
[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/memoffset-0.6.4/src/lib.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 | /     feature(
[INFO] [stdout] 63 | |         const_ptr_offset_from,
[INFO] [stdout] 64 | |         const_maybe_uninit_as_ptr,
[INFO] [stdout] 65 | |         const_raw_ptr_deref,
[INFO] [stdout] 66 | |         const_refs_to_cell,
[INFO] [stdout] 67 | |     )
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[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 `memoffset` 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" "48715e59b3118971c9386b5b20bf011dafcc5a17a50b86673b4e73f43a8ed2ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48715e59b3118971c9386b5b20bf011dafcc5a17a50b86673b4e73f43a8ed2ab", kill_on_drop: false }`
[INFO] [stdout] 48715e59b3118971c9386b5b20bf011dafcc5a17a50b86673b4e73f43a8ed2ab