[INFO] fetching crate rwcell 0.1.2...
[INFO] testing rwcell-0.1.2 against 1.54.0 for beta-1.55-1
[INFO] extracting crate rwcell 0.1.2 into /workspace/builds/worker-22/source
[INFO] validating manifest of crates.io crate rwcell 0.1.2 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-22/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 43c0ddb90e406bbbfd644d6300e1b491b0861bf4c60aaa1cc49397994669df2b
[INFO] running `Command { std: "docker" "start" "-a" "43c0ddb90e406bbbfd644d6300e1b491b0861bf4c60aaa1cc49397994669df2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "43c0ddb90e406bbbfd644d6300e1b491b0861bf4c60aaa1cc49397994669df2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "43c0ddb90e406bbbfd644d6300e1b491b0861bf4c60aaa1cc49397994669df2b", kill_on_drop: false }`
[INFO] [stdout] 43c0ddb90e406bbbfd644d6300e1b491b0861bf4c60aaa1cc49397994669df2b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8914a9eb3d57d4b072c0d5fbf54dd72fa0869d135b8f43acc43c4c7c3696391a
[INFO] running `Command { std: "docker" "start" "-a" "8914a9eb3d57d4b072c0d5fbf54dd72fa0869d135b8f43acc43c4c7c3696391a", kill_on_drop: false }`
[INFO] [stderr]    Compiling rwcell v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
[INFO] running `Command { std: "docker" "inspect" "8914a9eb3d57d4b072c0d5fbf54dd72fa0869d135b8f43acc43c4c7c3696391a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8914a9eb3d57d4b072c0d5fbf54dd72fa0869d135b8f43acc43c4c7c3696391a", kill_on_drop: false }`
[INFO] [stdout] 8914a9eb3d57d4b072c0d5fbf54dd72fa0869d135b8f43acc43c4c7c3696391a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 21f06e0b520bbe57e86cf8d0ee9a487583a654ac1b78c9cb2d4155b93d446529
[INFO] running `Command { std: "docker" "start" "-a" "21f06e0b520bbe57e86cf8d0ee9a487583a654ac1b78c9cb2d4155b93d446529", 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" "21f06e0b520bbe57e86cf8d0ee9a487583a654ac1b78c9cb2d4155b93d446529", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21f06e0b520bbe57e86cf8d0ee9a487583a654ac1b78c9cb2d4155b93d446529", kill_on_drop: false }`
[INFO] [stdout] 21f06e0b520bbe57e86cf8d0ee9a487583a654ac1b78c9cb2d4155b93d446529
