[INFO] fetching crate dep-obj 0.8.0...
[INFO] testing dep-obj-0.8.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate dep-obj 0.8.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate dep-obj 0.8.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate dep-obj 0.8.0
[INFO] finished tweaking crates.io crate dep-obj 0.8.0
[INFO] tweaked toml for crates.io crate dep-obj 0.8.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate dep-obj 0.8.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded paste v1.0.1
[INFO] [stderr]   Downloaded dyn-clone v1.0.2
[INFO] [stderr]   Downloaded downcast-rs v1.2.0
[INFO] [stderr]   Downloaded educe v0.4.13
[INFO] [stderr]   Downloaded num-bigint v0.3.0
[INFO] [stderr]   Downloaded syn v1.0.41
[INFO] [stderr]   Downloaded enum-ordinalize v3.1.8
[INFO] [stderr]   Downloaded generics v0.1.3
[INFO] [stderr]   Downloaded macro-attr-2018 v1.1.0
[INFO] [stderr]   Downloaded generics v0.2.5
[INFO] [stderr]   Downloaded dyn-context v0.3.1
[INFO] [stderr]   Downloaded proc-macro2 v1.0.21
[INFO] [stderr]   Downloaded phantom-type v0.3.0
[INFO] [stderr]   Downloaded rand_pcg v0.2.1
[INFO] [stderr]   Downloaded components-arena v1.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0624a5d50bfa1070d30df7d2a7deaf4d2a01b6f8ebb0128a6dc8323ca1f1cb7e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0624a5d50bfa1070d30df7d2a7deaf4d2a01b6f8ebb0128a6dc8323ca1f1cb7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0624a5d50bfa1070d30df7d2a7deaf4d2a01b6f8ebb0128a6dc8323ca1f1cb7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0624a5d50bfa1070d30df7d2a7deaf4d2a01b6f8ebb0128a6dc8323ca1f1cb7e", kill_on_drop: false }`
[INFO] [stdout] 0624a5d50bfa1070d30df7d2a7deaf4d2a01b6f8ebb0128a6dc8323ca1f1cb7e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b8e308641fa246bb5bcb8e9d1ce201c371356e4afb1cb9cc9758aec44ad536ad
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b8e308641fa246bb5bcb8e9d1ce201c371356e4afb1cb9cc9758aec44ad536ad", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.21
[INFO] [stderr]    Compiling syn v1.0.41
[INFO] [stderr]    Compiling ppv-lite86 v0.2.9
[INFO] [stderr]    Compiling generics v0.2.5
[INFO] [stderr]    Compiling generics v0.1.3
[INFO] [stderr]    Compiling paste v1.0.1
[INFO] [stderr]    Compiling dyn-clone v1.0.2
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.3.0
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling rand_pcg v0.2.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling dyn-context v0.3.1
[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-0.5.6/src/lib.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 | /     feature(
[INFO] [stdout] 63 | |         ptr_offset_from,
[INFO] [stdout] 64 | |         const_fn,
[INFO] [stdout] 65 | |         const_ptr_offset_from,
[INFO] [stdout] 66 | |         const_maybe_uninit_as_ptr,
[INFO] [stdout] 67 | |         const_raw_ptr_deref,
[INFO] [stdout] 68 | |     )
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[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-0.5.6/src/lib.rs:70:39
[INFO] [stdout]    |
[INFO] [stdout] 70 | #![cfg_attr(feature = "unstable_raw", feature(raw_ref_macros))]
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^^^^^^^^^^
[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 E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `memoffset`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "b8e308641fa246bb5bcb8e9d1ce201c371356e4afb1cb9cc9758aec44ad536ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8e308641fa246bb5bcb8e9d1ce201c371356e4afb1cb9cc9758aec44ad536ad", kill_on_drop: false }`
[INFO] [stdout] b8e308641fa246bb5bcb8e9d1ce201c371356e4afb1cb9cc9758aec44ad536ad