[INFO] fetching crate bear 0.2.0...
[INFO] checking bear-0.2.0 against try#f6e2f78768c57172b99c3e85892f867894dc7e30 for pr-75502
[INFO] extracting crate bear 0.2.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate bear 0.2.0 on toolchain f6e2f78768c57172b99c3e85892f867894dc7e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate bear 0.2.0
[INFO] finished tweaking crates.io crate bear 0.2.0
[INFO] tweaked toml for crates.io crate bear 0.2.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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:e18d859f9e32a1da89bc7b2d7d51e13b57342044d1295d9fc0dd0068c58eb3d1" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 14cd64f1fc5df8893a65fb8e780d19b3ba6e749401caa5e451c3a4cc24d49c78
[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" "14cd64f1fc5df8893a65fb8e780d19b3ba6e749401caa5e451c3a4cc24d49c78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "14cd64f1fc5df8893a65fb8e780d19b3ba6e749401caa5e451c3a4cc24d49c78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14cd64f1fc5df8893a65fb8e780d19b3ba6e749401caa5e451c3a4cc24d49c78", kill_on_drop: false }`
[INFO] [stdout] 14cd64f1fc5df8893a65fb8e780d19b3ba6e749401caa5e451c3a4cc24d49c78
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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=forbid" "-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:e18d859f9e32a1da89bc7b2d7d51e13b57342044d1295d9fc0dd0068c58eb3d1" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "check" "--frozen" "--all" "--all-targets" "--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] c0a8f121f0279706cedca989b4ebbcbe8b9f8fbd9f9d5a89cfa54df6262a26b7
[INFO] running `Command { std: "docker" "start" "-a" "c0a8f121f0279706cedca989b4ebbcbe8b9f8fbd9f9d5a89cfa54df6262a26b7", kill_on_drop: false }`
[INFO] [stderr]     Checking bear v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: malformed `unstable` attribute input
[INFO] [stdout]   --> src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![unstable]
[INFO] [stdout]    | ^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: malformed `unstable` attribute input
[INFO] [stdout]   --> src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![unstable]
[INFO] [stdout]    | ^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bear`.
[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] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c0a8f121f0279706cedca989b4ebbcbe8b9f8fbd9f9d5a89cfa54df6262a26b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0a8f121f0279706cedca989b4ebbcbe8b9f8fbd9f9d5a89cfa54df6262a26b7", kill_on_drop: false }`
[INFO] [stdout] c0a8f121f0279706cedca989b4ebbcbe8b9f8fbd9f9d5a89cfa54df6262a26b7