[INFO] fetching crate queueue 0.1.1-beta.3...
[INFO] testing queueue-0.1.1-beta.3 against 1.49.0 for beta-1.50-1
[INFO] extracting crate queueue 0.1.1-beta.3 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate queueue 0.1.1-beta.3 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 queueue 0.1.1-beta.3
[INFO] finished tweaking crates.io crate queueue 0.1.1-beta.3
[INFO] tweaked toml for crates.io crate queueue 0.1.1-beta.3 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/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] 0ec332329d95d005facee53d98729be2d19a77e37710b4b542d559363793e9a8
[INFO] running `Command { std: "docker" "start" "-a" "0ec332329d95d005facee53d98729be2d19a77e37710b4b542d559363793e9a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0ec332329d95d005facee53d98729be2d19a77e37710b4b542d559363793e9a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ec332329d95d005facee53d98729be2d19a77e37710b4b542d559363793e9a8", kill_on_drop: false }`
[INFO] [stdout] 0ec332329d95d005facee53d98729be2d19a77e37710b4b542d559363793e9a8
[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" "+1.49.0" "build" "--frozen" "--message-format=json", 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] 5323f44d17fcaceb03ed8403bfb7ac490a7b9db12b5130023228256c303f6a20
[INFO] running `Command { std: "docker" "start" "-a" "5323f44d17fcaceb03ed8403bfb7ac490a7b9db12b5130023228256c303f6a20", kill_on_drop: false }`
[INFO] [stderr]    Compiling queueue v0.1.1-beta.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_generics, maybe_uninit_uninit_array, internal_uninit_const, const_fn, const_in_array_repeat_expressions)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_generics, maybe_uninit_uninit_array, internal_uninit_const, const_fn, const_in_array_repeat_expressions)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]   = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
[INFO] [stdout]   = help: consider using `min_const_generics` instead, which is more stable and complete
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]   --> src/queue/nonblocking.rs:35:25
[INFO] [stdout]    |
[INFO] [stdout] 35 |     slots: [Slot<T, S>; {N}],
[INFO] [stdout]    |                         ^^^ help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around const expression
[INFO] [stdout]    --> src/timing_wheel/hierarchical.rs:222:31
[INFO] [stdout]     |
[INFO] [stdout] 222 |     storage: [MaybeUninit<T>; {N}],
[INFO] [stdout]     |                               ^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: constant expression depends on a generic parameter
[INFO] [stdout]    --> src/timing_wheel/hierarchical.rs:103:13
[INFO] [stdout]     |
[INFO] [stdout] 103 |     levels: [WheelLevel<S, CUTOFF>; LEVEL],
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this may fail depending on what value the parameter takes
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `queueue`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "5323f44d17fcaceb03ed8403bfb7ac490a7b9db12b5130023228256c303f6a20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5323f44d17fcaceb03ed8403bfb7ac490a7b9db12b5130023228256c303f6a20", kill_on_drop: false }`
[INFO] [stdout] 5323f44d17fcaceb03ed8403bfb7ac490a7b9db12b5130023228256c303f6a20