[INFO] fetching crate eloggr 0.1.2...
[INFO] testing eloggr-0.1.2 against 1.55.0 for beta-1.56-1
[INFO] extracting crate eloggr 0.1.2 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate eloggr 0.1.2 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] started tweaking crates.io crate eloggr 0.1.2
[INFO] finished tweaking crates.io crate eloggr 0.1.2
[INFO] tweaked toml for crates.io crate eloggr 0.1.2 written to /workspace/builds/worker-2/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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded fallible v0.1.3
[INFO] [stderr]   Downloaded rel v0.2.0
[INFO] [stderr]   Downloaded default_allocator v0.3.0
[INFO] [stderr]   Downloaded utf v0.1.6
[INFO] [stderr]   Downloaded heap v0.1.0
[INFO] [stderr]   Downloaded loca v0.7.2
[INFO] [stderr]   Downloaded idem v0.4.0
[INFO] [stderr]   Downloaded null-terminated v0.3.15
[INFO] [stderr]   Downloaded i-o v0.4.7
[INFO] [stderr]   Downloaded hash-table v0.2.5
[INFO] [stderr]   Downloaded idem v0.1.1
[INFO] [stderr]   Downloaded flags v0.1.5
[INFO] [stderr]   Downloaded abort v0.1.3
[INFO] [stderr]   Downloaded unix-tty v0.3.4
[INFO] [stderr]   Downloaded tempus v0.2.4
[INFO] [stderr]   Downloaded ptr v0.2.3
[INFO] [stderr]   Downloaded unix v0.6.12
[INFO] [stderr]   Downloaded system-call v0.1.3
[INFO] [stderr]   Downloaded containers v0.9.12
[INFO] [stderr]   Downloaded libc-interface v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] d7e989095d272efeb9fe9c1a739c9f507b52088e568d6df567cad71a6637ca6a
[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" "d7e989095d272efeb9fe9c1a739c9f507b52088e568d6df567cad71a6637ca6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d7e989095d272efeb9fe9c1a739c9f507b52088e568d6df567cad71a6637ca6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d7e989095d272efeb9fe9c1a739c9f507b52088e568d6df567cad71a6637ca6a", kill_on_drop: false }`
[INFO] [stdout] d7e989095d272efeb9fe9c1a739c9f507b52088e568d6df567cad71a6637ca6a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 4dd1392b5190eec7ba04f9e9f3bcfdec5d3f6d868083ca60b0854147c0e173b9
[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" "4dd1392b5190eec7ba04f9e9f3bcfdec5d3f6d868083ca60b0854147c0e173b9", kill_on_drop: false }`
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling ptr v0.2.3
[INFO] [stderr]    Compiling hash-table v0.2.5
[INFO] [stderr]    Compiling containers v0.9.12
[INFO] [stderr]    Compiling heap v0.1.0
[INFO] [stderr]    Compiling abort v0.1.3
[INFO] [stderr]    Compiling rel v0.2.0
[INFO] [stderr]    Compiling i-o v0.4.7
[INFO] [stderr]    Compiling idem v0.4.0
[INFO] [stderr]    Compiling libc-interface v0.1.2
[INFO] [stderr]    Compiling utf v0.1.6
[INFO] [stderr]    Compiling system-call v0.1.3
[INFO] [stderr]    Compiling flags v0.1.5
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling fallible v0.1.3
[INFO] [stderr]    Compiling unix v0.6.12
[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/system-call-0.1.3/src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(llvm_asm)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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]    Compiling idem v0.1.1
[INFO] [stderr] error: could not compile `system-call` 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" "4dd1392b5190eec7ba04f9e9f3bcfdec5d3f6d868083ca60b0854147c0e173b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4dd1392b5190eec7ba04f9e9f3bcfdec5d3f6d868083ca60b0854147c0e173b9", kill_on_drop: false }`
[INFO] [stdout] 4dd1392b5190eec7ba04f9e9f3bcfdec5d3f6d868083ca60b0854147c0e173b9