[INFO] fetching crate keytokey 0.3.0...
[INFO] testing keytokey-0.3.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate keytokey 0.3.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate keytokey 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 keytokey 0.3.0
[INFO] finished tweaking crates.io crate keytokey 0.3.0
[INFO] tweaked toml for crates.io crate keytokey 0.3.0 written to /workspace/builds/worker-1/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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded generic-array v0.11.1
[INFO] [stderr]   Downloaded heapless v0.4.4
[INFO] [stderr]   Downloaded smallbitvec v2.5.0
[INFO] [stderr]   Downloaded no-std-compat v0.1.1
[INFO] [stderr]   Downloaded num_enum v0.3.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] [stdout] 4bb67998a724adc3b9351e0c0b2c704b3358869477a54c660e71868340a29c30
[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" "4bb67998a724adc3b9351e0c0b2c704b3358869477a54c660e71868340a29c30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4bb67998a724adc3b9351e0c0b2c704b3358869477a54c660e71868340a29c30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bb67998a724adc3b9351e0c0b2c704b3358869477a54c660e71868340a29c30", kill_on_drop: false }`
[INFO] [stdout] 4bb67998a724adc3b9351e0c0b2c704b3358869477a54c660e71868340a29c30
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] a5ef3a49a48d9e93f12f409482794b4744956efe48b083c083514575d6ca1ae0
[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" "a5ef3a49a48d9e93f12f409482794b4744956efe48b083c083514575d6ca1ae0", kill_on_drop: false }`
[INFO] [stderr]    Compiling heapless v0.4.4
[INFO] [stderr]    Compiling smallbitvec v2.5.0
[INFO] [stderr]    Compiling no-std-compat v0.1.1
[INFO] [stderr]    Compiling hash32 v0.1.1
[INFO] [stderr]    Compiling num_enum v0.3.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/no-std-compat-0.1.1/src/lib.rs:1:43
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(not(feature = "std"), no_std, feature(fixed_size_array, core_intrinsics, core_panic_info, core_panic, raw, unicode_internals))]
[INFO] [stdout]   |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/no-std-compat-0.1.1/src/lib.rs:2:59
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(all(not(feature = "std"), feature = "alloc"), feature(alloc_prelude, 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 `no-std-compat`
[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" "a5ef3a49a48d9e93f12f409482794b4744956efe48b083c083514575d6ca1ae0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a5ef3a49a48d9e93f12f409482794b4744956efe48b083c083514575d6ca1ae0", kill_on_drop: false }`
[INFO] [stdout] a5ef3a49a48d9e93f12f409482794b4744956efe48b083c083514575d6ca1ae0