[INFO] fetching crate ramp 0.5.9...
[INFO] testing ramp-0.5.9 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate ramp 0.5.9 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate ramp 0.5.9 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ramp 0.5.9
[INFO] finished tweaking crates.io crate ramp 0.5.9
[INFO] tweaked toml for crates.io crate ramp 0.5.9 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate ramp 0.5.9 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--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 num-integer v0.1.35
[INFO] [stderr]   Downloaded memchr v2.0.1
[INFO] [stderr]   Downloaded lazy_static v1.0.0
[INFO] [stderr]   Downloaded num-traits v0.1.40
[INFO] [stderr]   Downloaded utf8-ranges v1.0.0
[INFO] [stderr]   Downloaded rand v0.5.4
[INFO] [stderr]   Downloaded rand_core v0.2.1
[INFO] [stderr]   Downloaded magenta v0.1.1
[INFO] [stderr]   Downloaded thread_local v0.3.5
[INFO] [stderr]   Downloaded log v0.3.8
[INFO] [stderr]   Downloaded winapi v0.3.5
[INFO] [stderr]   Downloaded cc v1.0.17
[INFO] [stderr]   Downloaded ieee754 v0.2.2
[INFO] [stderr]   Downloaded regex-syntax v0.4.1
[INFO] [stderr]   Downloaded magenta-sys v0.1.1
[INFO] [stderr]   Downloaded regex v0.2.3
[INFO] [stderr]   Downloaded rand v0.3.16
[INFO] [stderr]   Downloaded rand v0.4.1
[INFO] [stderr]   Downloaded rust-gmp v0.2.10
[INFO] [stderr]   Downloaded aho-corasick v0.6.4
[INFO] [stderr]   Downloaded quickcheck v0.6.0
[INFO] [stderr]   Downloaded libc v0.2.29
[INFO] [stderr]   Downloaded num-bigint v0.1.40
[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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7c7ba3d75afba39d441e5839370b0549e1c31ebe608f2020ef1b848ea4a39a6e
[INFO] running `Command { std: "docker" "start" "-a" "7c7ba3d75afba39d441e5839370b0549e1c31ebe608f2020ef1b848ea4a39a6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7c7ba3d75afba39d441e5839370b0549e1c31ebe608f2020ef1b848ea4a39a6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c7ba3d75afba39d441e5839370b0549e1c31ebe608f2020ef1b848ea4a39a6e", kill_on_drop: false }`
[INFO] [stdout] 7c7ba3d75afba39d441e5839370b0549e1c31ebe608f2020ef1b848ea4a39a6e
[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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d309e92bc7e99f41f02294a1bfb69ef0ec3b2219070c6970f356257931da663f
[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" "d309e92bc7e99f41f02294a1bfb69ef0ec3b2219070c6970f356257931da663f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.29
[INFO] [stderr]    Compiling num-traits v0.1.40
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling rustc-cfg v0.2.0
[INFO] [stderr]    Compiling cc v1.0.17
[INFO] [stderr]    Compiling rand_core v0.2.1
[INFO] [stderr]    Compiling hamming v0.1.3
[INFO] [stderr]    Compiling ieee754 v0.2.2
[INFO] [stderr]    Compiling rand v0.3.16
[INFO] [stderr]    Compiling rand v0.5.4
[INFO] [stderr]    Compiling num-integer v0.1.35
[INFO] [stderr]    Compiling num-bigint v0.1.40
[INFO] [stderr]    Compiling ramp v0.5.9 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![feature(core_intrinsics, asm, allocator_api)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:18:1
[INFO] [stdout]    |
[INFO] [stdout] 18 | #![feature(step_trait, step_trait_ext, ptr_internals, raw_vec_internals)]
[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 `ramp`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "d309e92bc7e99f41f02294a1bfb69ef0ec3b2219070c6970f356257931da663f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d309e92bc7e99f41f02294a1bfb69ef0ec3b2219070c6970f356257931da663f", kill_on_drop: false }`
[INFO] [stdout] d309e92bc7e99f41f02294a1bfb69ef0ec3b2219070c6970f356257931da663f