[INFO] fetching crate hidefix 0.3.0...
[INFO] testing hidefix-0.3.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate hidefix 0.3.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate hidefix 0.3.0 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 hidefix 0.3.0
[INFO] finished tweaking crates.io crate hidefix 0.3.0
[INFO] tweaked toml for crates.io crate hidefix 0.3.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate hidefix 0.3.0 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] 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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6dc37add27fd6f364e47ee4770b2de8c78b228cc8cbb0e050f4b742f56ea4a95
[INFO] running `Command { std: "docker" "start" "-a" "6dc37add27fd6f364e47ee4770b2de8c78b228cc8cbb0e050f4b742f56ea4a95", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6dc37add27fd6f364e47ee4770b2de8c78b228cc8cbb0e050f4b742f56ea4a95", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6dc37add27fd6f364e47ee4770b2de8c78b228cc8cbb0e050f4b742f56ea4a95", kill_on_drop: false }`
[INFO] [stdout] 6dc37add27fd6f364e47ee4770b2de8c78b228cc8cbb0e050f4b742f56ea4a95
[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] d3f22b5d3341ff4bd8d9486726d5c6fb7f02af06d777cd527c4d889546f24d51
[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" "d3f22b5d3341ff4bd8d9486726d5c6fb7f02af06d777cd527c4d889546f24d51", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.62
[INFO] [stderr]    Compiling once_cell v1.5.1
[INFO] [stderr]    Compiling smallvec v1.4.2
[INFO] [stderr]    Compiling ndarray v0.13.1
[INFO] [stderr]    Compiling hdf5 v0.7.0
[INFO] [stderr]    Compiling ascii v1.0.0
[INFO] [stderr]    Compiling strength_reduce v0.2.3
[INFO] [stderr]    Compiling byte-slice-cast v1.0.0
[INFO] [stderr]    Compiling libloading v0.6.5
[INFO] [stderr]    Compiling tokio v0.3.3
[INFO] [stderr]    Compiling hashbrown v0.9.1
[INFO] [stderr]    Compiling pin-project-internal v1.0.1
[INFO] [stderr]    Compiling futures-macro v0.3.8
[INFO] [stderr]    Compiling derivative v2.1.1
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling hdf5-derive v0.7.0
[INFO] [stderr]    Compiling async-stream-impl v0.3.0
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling zerocopy-derive v0.2.0
[INFO] [stderr]    Compiling futures-task v0.3.8
[INFO] [stderr]    Compiling parking_lot_core v0.7.2
[INFO] [stderr]    Compiling hdf5-sys v0.7.0
[INFO] [stderr]    Compiling hdf5-types v0.7.0
[INFO] [stderr]    Compiling parking_lot v0.10.2
[INFO] [stderr]    Compiling lru v0.6.1
[INFO] [stderr]    Compiling cmake v0.1.44
[INFO] [stderr]    Compiling libz-sys v1.1.2
[INFO] [stderr]    Compiling hdf5-src v0.7.0
[INFO] [stderr]    Compiling libdeflate-sys v0.5.0
[INFO] [stderr]    Compiling zerocopy v0.3.0
[INFO] [stderr]    Compiling async-stream v0.3.0
[INFO] [stderr]    Compiling pin-project v1.0.1
[INFO] [stderr]    Compiling futures-util v0.3.8
[INFO] [stderr]    Compiling libdeflater v0.5.0
[INFO] [stderr]    Compiling toml v0.5.7
[INFO] [stderr]    Compiling bincode v1.3.1
[INFO] [stderr]    Compiling serde_bytes v0.11.5
[INFO] [stderr]    Compiling proc-macro-crate v0.1.5
[INFO] [stderr]    Compiling num_enum_derive v0.5.1
[INFO] [stderr]    Compiling futures-executor v0.3.8
[INFO] [stderr]    Compiling futures v0.3.8
[INFO] [stderr]    Compiling num_enum v0.5.1
[INFO] [stderr]    Compiling flexbuffers v0.1.1
[INFO] [stderr]    Compiling hidefix v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:47:1
[INFO] [stdout]    |
[INFO] [stdout] 47 | #![feature(test)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:48:1
[INFO] [stdout]    |
[INFO] [stdout] 48 | #![feature(const_generics, fixed_size_array, cow_is_borrowed, array_methods)]
[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 `hidefix`
[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" "d3f22b5d3341ff4bd8d9486726d5c6fb7f02af06d777cd527c4d889546f24d51", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3f22b5d3341ff4bd8d9486726d5c6fb7f02af06d777cd527c4d889546f24d51", kill_on_drop: false }`
[INFO] [stdout] d3f22b5d3341ff4bd8d9486726d5c6fb7f02af06d777cd527c4d889546f24d51