[INFO] fetching crate nova-snark 0.4.0...
[INFO] testing nova-snark-0.4.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate nova-snark 0.4.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate nova-snark 0.4.0 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] started tweaking crates.io crate nova-snark 0.4.0
[INFO] finished tweaking crates.io crate nova-snark 0.4.0
[INFO] tweaked toml for crates.io crate nova-snark 0.4.0 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 44c0dee65e63e4eba2d9534dacf1bd4c7e6637a9945e3a4e6a6f509a41a63bea
[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" "44c0dee65e63e4eba2d9534dacf1bd4c7e6637a9945e3a4e6a6f509a41a63bea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "44c0dee65e63e4eba2d9534dacf1bd4c7e6637a9945e3a4e6a6f509a41a63bea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44c0dee65e63e4eba2d9534dacf1bd4c7e6637a9945e3a4e6a6f509a41a63bea", kill_on_drop: false }`
[INFO] [stdout] 44c0dee65e63e4eba2d9534dacf1bd4c7e6637a9945e3a4e6a6f509a41a63bea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 649fbe6986c8289ce70154b1dc0afd6b50f30241b343efc07c509d522bb00796
[INFO] running `Command { std: "docker" "start" "-a" "649fbe6986c8289ce70154b1dc0afd6b50f30241b343efc07c509d522bb00796", kill_on_drop: false }`
[INFO] [stderr]    Compiling radium v0.6.2
[INFO] [stderr]    Compiling funty v1.2.0
[INFO] [stderr]    Compiling execute-command-tokens v0.1.4
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling byte-slice-cast v1.2.1
[INFO] [stderr]    Compiling wyz v0.4.0
[INFO] [stderr]    Compiling lock_api v0.4.6
[INFO] [stderr]    Compiling blst v0.3.7
[INFO] [stderr]    Compiling threadpool v1.8.1
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.7
[INFO] [stderr]    Compiling zeroize_derive v1.1.1
[INFO] [stderr]    Compiling execute-command-macro-impl v0.1.6
[INFO] [stderr]    Compiling sha3 v0.8.2
[INFO] [stderr]    Compiling crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling spin v0.9.2
[INFO] [stderr]    Compiling blake2s_simd v0.5.11
[INFO] [stderr]    Compiling blake2b_simd v0.5.11
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling flume v0.10.11
[INFO] [stderr]    Compiling bitvec v0.22.3
[INFO] [stderr]    Compiling yastl v0.1.2
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling execute-command-macro v0.1.6
[INFO] [stderr]    Compiling zeroize v1.3.0
[INFO] [stderr]    Compiling execute v0.2.9
[INFO] [stderr]    Compiling merlin v2.0.1
[INFO] [stderr]    Compiling ff v0.11.0
[INFO] [stderr]    Compiling group v0.11.0
[INFO] [stderr]    Compiling pairing v0.21.0
[INFO] [stderr]    Compiling pasta_curves v0.2.1
[INFO] [stderr]    Compiling blstrs v0.4.2
[INFO] [stderr]    Compiling bellperson v0.18.2
[INFO] [stderr]    Compiling nova-snark v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(test)]
[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 `nova-snark` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "649fbe6986c8289ce70154b1dc0afd6b50f30241b343efc07c509d522bb00796", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "649fbe6986c8289ce70154b1dc0afd6b50f30241b343efc07c509d522bb00796", kill_on_drop: false }`
[INFO] [stdout] 649fbe6986c8289ce70154b1dc0afd6b50f30241b343efc07c509d522bb00796