[INFO] fetching crate rwcell 0.1.2...
[INFO] testing rwcell-0.1.2 against 1.47.0 for beta-1.48-1
[INFO] extracting crate rwcell 0.1.2 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate rwcell 0.1.2 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rwcell 0.1.2
[INFO] finished tweaking crates.io crate rwcell 0.1.2
[INFO] tweaked toml for crates.io crate rwcell 0.1.2 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b4350a13c5a82f2cc8163e5b94202a77f80df3bbf68ddd40ea1d55ffdb4ff28d
[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" "b4350a13c5a82f2cc8163e5b94202a77f80df3bbf68ddd40ea1d55ffdb4ff28d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b4350a13c5a82f2cc8163e5b94202a77f80df3bbf68ddd40ea1d55ffdb4ff28d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4350a13c5a82f2cc8163e5b94202a77f80df3bbf68ddd40ea1d55ffdb4ff28d", kill_on_drop: false }`
[INFO] [stdout] b4350a13c5a82f2cc8163e5b94202a77f80df3bbf68ddd40ea1d55ffdb4ff28d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 111f9a09837a05435c8230850a1c624d4f5e87c1c74fa5f5ed2ef1aeca2309fd
[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" "111f9a09837a05435c8230850a1c624d4f5e87c1c74fa5f5ed2ef1aeca2309fd", kill_on_drop: false }`
[INFO] [stderr]    Compiling rwcell v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.14s
[INFO] running `Command { std: "docker" "inspect" "111f9a09837a05435c8230850a1c624d4f5e87c1c74fa5f5ed2ef1aeca2309fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "111f9a09837a05435c8230850a1c624d4f5e87c1c74fa5f5ed2ef1aeca2309fd", kill_on_drop: false }`
[INFO] [stdout] 111f9a09837a05435c8230850a1c624d4f5e87c1c74fa5f5ed2ef1aeca2309fd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "test" "--frozen" "--no-run" "--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] c10423d77a4e7490c36edd87948260dc5c6303edcb577b63be7dd041b64accf2
[INFO] running `Command { std: "docker" "start" "-a" "c10423d77a4e7490c36edd87948260dc5c6303edcb577b63be7dd041b64accf2", kill_on_drop: false }`
[INFO] [stderr]    Compiling rwcell v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(time2)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]   --> src/rwcell.rs:48:50
[INFO] [stdout]    |
[INFO] [stdout] 48 |             values: unsafe { Some(UnsafeCell::new([value, mem::uninitialized(), mem::uninitialized()])) },
[INFO] [stdout]    |                                                           ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]   --> src/rwcell.rs:48:72
[INFO] [stdout]    |
[INFO] [stdout] 48 |             values: unsafe { Some(UnsafeCell::new([value, mem::uninitialized(), mem::uninitialized()])) },
[INFO] [stdout]    |                                                                                 ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 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 `rwcell`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "c10423d77a4e7490c36edd87948260dc5c6303edcb577b63be7dd041b64accf2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c10423d77a4e7490c36edd87948260dc5c6303edcb577b63be7dd041b64accf2", kill_on_drop: false }`
[INFO] [stdout] c10423d77a4e7490c36edd87948260dc5c6303edcb577b63be7dd041b64accf2
