[INFO] fetching crate packed-vec 0.0.1-alpha.11...
[INFO] checking packed-vec-0.0.1-alpha.11 against 1.55.0 for beta-1.56-3
[INFO] extracting crate packed-vec 0.0.1-alpha.11 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate packed-vec 0.0.1-alpha.11 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 packed-vec 0.0.1-alpha.11
[INFO] finished tweaking crates.io crate packed-vec 0.0.1-alpha.11
[INFO] tweaked toml for crates.io crate packed-vec 0.0.1-alpha.11 written to /workspace/builds/worker-8/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-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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] 19d68a82b865e4edd0efb851b93cfec64ff4c9874af8234fa7fb3fc8c2c74c0d
[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" "19d68a82b865e4edd0efb851b93cfec64ff4c9874af8234fa7fb3fc8c2c74c0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "19d68a82b865e4edd0efb851b93cfec64ff4c9874af8234fa7fb3fc8c2c74c0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19d68a82b865e4edd0efb851b93cfec64ff4c9874af8234fa7fb3fc8c2c74c0d", kill_on_drop: false }`
[INFO] [stdout] 19d68a82b865e4edd0efb851b93cfec64ff4c9874af8234fa7fb3fc8c2c74c0d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0fff2c8b9cac5abbf3c41a7919c5e571077514ae46e996839bbd6410eeee3b6e
[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" "0fff2c8b9cac5abbf3c41a7919c5e571077514ae46e996839bbd6410eeee3b6e", kill_on_drop: false }`
[INFO] [stderr]     Checking prefix-varint v0.0.1-alpha.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/prefix-varint-0.0.1-alpha.5/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(int_bits_const, try_blocks)]
[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] error: could not compile `prefix-varint` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "0fff2c8b9cac5abbf3c41a7919c5e571077514ae46e996839bbd6410eeee3b6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0fff2c8b9cac5abbf3c41a7919c5e571077514ae46e996839bbd6410eeee3b6e", kill_on_drop: false }`
[INFO] [stdout] 0fff2c8b9cac5abbf3c41a7919c5e571077514ae46e996839bbd6410eeee3b6e
