[INFO] fetching crate rpni 0.1.1...
[INFO] testing rpni-0.1.1 against 1.59.0 for beta-1.60-1
[INFO] extracting crate rpni 0.1.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate rpni 0.1.1 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-6/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate rpni 0.1.1
[INFO] finished tweaking crates.io crate rpni 0.1.1
[INFO] tweaked toml for crates.io crate rpni 0.1.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate rpni 0.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7d275edf7a7ab6128e5c9551577d6f32a6b545d5bd00dcc069eeba933966bdf4
[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" "7d275edf7a7ab6128e5c9551577d6f32a6b545d5bd00dcc069eeba933966bdf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7d275edf7a7ab6128e5c9551577d6f32a6b545d5bd00dcc069eeba933966bdf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d275edf7a7ab6128e5c9551577d6f32a6b545d5bd00dcc069eeba933966bdf4", kill_on_drop: false }`
[INFO] [stdout] 7d275edf7a7ab6128e5c9551577d6f32a6b545d5bd00dcc069eeba933966bdf4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dd43c855eb0514d41de36cecae84009e6fea417ac7c251d86e1fbe8946525e76
[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" "dd43c855eb0514d41de36cecae84009e6fea417ac7c251d86e1fbe8946525e76", kill_on_drop: false }`
[INFO] [stderr]    Compiling anyhow v1.0.53
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling utf8-chars v1.0.2
[INFO] [stderr]    Compiling rpni v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.54s
[INFO] running `Command { std: "docker" "inspect" "dd43c855eb0514d41de36cecae84009e6fea417ac7c251d86e1fbe8946525e76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd43c855eb0514d41de36cecae84009e6fea417ac7c251d86e1fbe8946525e76", kill_on_drop: false }`
[INFO] [stdout] dd43c855eb0514d41de36cecae84009e6fea417ac7c251d86e1fbe8946525e76
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2b95e21cc2b50a36869111ad6db1d72ec59d21d6fc37529c62082661e2149aa7
[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" "2b95e21cc2b50a36869111ad6db1d72ec59d21d6fc37529c62082661e2149aa7", kill_on_drop: false }`
[INFO] [stderr]    Compiling rpni v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:27
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(test, feature(assert_matches))]
[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 `rpni` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "2b95e21cc2b50a36869111ad6db1d72ec59d21d6fc37529c62082661e2149aa7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b95e21cc2b50a36869111ad6db1d72ec59d21d6fc37529c62082661e2149aa7", kill_on_drop: false }`
[INFO] [stdout] 2b95e21cc2b50a36869111ad6db1d72ec59d21d6fc37529c62082661e2149aa7