[INFO] fetching crate cipherdogs-logo-lib 0.1.0...
[INFO] testing cipherdogs-logo-lib-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate cipherdogs-logo-lib 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate cipherdogs-logo-lib 0.1.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-4/source/rust-toolchain
[INFO] started tweaking crates.io crate cipherdogs-logo-lib 0.1.0
[INFO] finished tweaking crates.io crate cipherdogs-logo-lib 0.1.0
[INFO] tweaked toml for crates.io crate cipherdogs-logo-lib 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c8c51dc26ff0a4478c6b09c529d83d4e035a9f3e4233a081c0294dbf4373490a
[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" "c8c51dc26ff0a4478c6b09c529d83d4e035a9f3e4233a081c0294dbf4373490a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c8c51dc26ff0a4478c6b09c529d83d4e035a9f3e4233a081c0294dbf4373490a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8c51dc26ff0a4478c6b09c529d83d4e035a9f3e4233a081c0294dbf4373490a", kill_on_drop: false }`
[INFO] [stdout] c8c51dc26ff0a4478c6b09c529d83d4e035a9f3e4233a081c0294dbf4373490a
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a8cc7f72839bd474e9bf6ddb2354035d744b9e995d165fd5690825b6f1441819
[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" "a8cc7f72839bd474e9bf6ddb2354035d744b9e995d165fd5690825b6f1441819", kill_on_drop: false }`
[INFO] [stderr]    Compiling x86_64 v0.14.4
[INFO] [stderr]    Compiling conquer-util v0.3.0
[INFO] [stderr]    Compiling volatile v0.4.4
[INFO] [stderr]    Compiling font8x8 v0.3.1
[INFO] [stderr]    Compiling lock_api v0.4.5
[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/lock_api-0.4.5/src/lib.rs:93:34
[INFO] [stdout]    |
[INFO] [stdout] 93 | #![cfg_attr(feature = "nightly", feature(const_fn_trait_bound))]
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling conquer-once v0.3.2
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `lock_api` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "a8cc7f72839bd474e9bf6ddb2354035d744b9e995d165fd5690825b6f1441819", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8cc7f72839bd474e9bf6ddb2354035d744b9e995d165fd5690825b6f1441819", kill_on_drop: false }`
[INFO] [stdout] a8cc7f72839bd474e9bf6ddb2354035d744b9e995d165fd5690825b6f1441819