[INFO] fetching crate multiproof-rs 0.1.7...
[INFO] testing multiproof-rs-0.1.7 against 1.44.0 for beta-1.45-1
[INFO] extracting crate multiproof-rs 0.1.7 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate multiproof-rs 0.1.7 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate multiproof-rs 0.1.7
[INFO] finished tweaking crates.io crate multiproof-rs 0.1.7
[INFO] tweaked toml for crates.io crate multiproof-rs 0.1.7 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] dc8fedd11b465d4ffb6368befe7a26b621a258747e2fbd62baaa5c39c5715340
[INFO] running `"docker" "start" "-a" "dc8fedd11b465d4ffb6368befe7a26b621a258747e2fbd62baaa5c39c5715340"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling byte-tools v0.3.1
[INFO] [stderr]    Compiling keccak v0.1.0
[INFO] [stderr]    Compiling half v1.6.0
[INFO] [stderr]    Compiling rustc-hex v2.1.0
[INFO] [stderr]    Compiling opaque-debug v0.2.3
[INFO] [stderr]    Compiling hex v0.4.2
[INFO] [stderr]    Compiling block-padding v0.1.5
[INFO] [stderr]    Compiling rlp v0.4.5
[INFO] [stderr]    Compiling serde_cbor v0.10.2
[INFO] [stderr]    Compiling generic-array v0.12.3
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling sha3 v0.8.2
[INFO] [stderr]    Compiling multiproof-rs v0.1.7 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(box_syntax, box_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `multiproof-rs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "dc8fedd11b465d4ffb6368befe7a26b621a258747e2fbd62baaa5c39c5715340"`
[INFO] running `"docker" "rm" "-f" "dc8fedd11b465d4ffb6368befe7a26b621a258747e2fbd62baaa5c39c5715340"`
[INFO] [stdout] dc8fedd11b465d4ffb6368befe7a26b621a258747e2fbd62baaa5c39c5715340