[INFO] fetching crate syntex_bitflags 0.1.0...
[INFO] testing syntex_bitflags-0.1.0 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate syntex_bitflags 0.1.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate syntex_bitflags 0.1.0 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate syntex_bitflags 0.1.0
[INFO] finished tweaking crates.io crate syntex_bitflags 0.1.0
[INFO] tweaked toml for crates.io crate syntex_bitflags 0.1.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 18e9d31eb67d815821bf366a8475fb670b523a5c41a309dbbfa4fb2b6cdb431a
[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" "18e9d31eb67d815821bf366a8475fb670b523a5c41a309dbbfa4fb2b6cdb431a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "18e9d31eb67d815821bf366a8475fb670b523a5c41a309dbbfa4fb2b6cdb431a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18e9d31eb67d815821bf366a8475fb670b523a5c41a309dbbfa4fb2b6cdb431a", kill_on_drop: false }`
[INFO] [stdout] 18e9d31eb67d815821bf366a8475fb670b523a5c41a309dbbfa4fb2b6cdb431a
[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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 25cfd8a6da46d4338e31887673e2e6a78c3ad5015cef8af1991e6a8142dc33df
[INFO] running `Command { std: "docker" "start" "-a" "25cfd8a6da46d4338e31887673e2e6a78c3ad5015cef8af1991e6a8142dc33df", kill_on_drop: false }`
[INFO] [stderr]    Compiling syntex_bitflags v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: malformed `unstable` attribute input
[INFO] [stdout]   --> src/lib.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![unstable]
[INFO] [stdout]    | ^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot find attribute `staged_api` in this scope
[INFO] [stdout]   --> src/lib.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![staged_api]
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `syntex_bitflags`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "25cfd8a6da46d4338e31887673e2e6a78c3ad5015cef8af1991e6a8142dc33df", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25cfd8a6da46d4338e31887673e2e6a78c3ad5015cef8af1991e6a8142dc33df", kill_on_drop: false }`
[INFO] [stdout] 25cfd8a6da46d4338e31887673e2e6a78c3ad5015cef8af1991e6a8142dc33df