[INFO] updating cached repository https://github.com/metaworm/easy-rpc
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] abdea55a0b278b68339a60ae6aba9b4d5f1d249b
[INFO] testing metaworm/easy-rpc against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmetaworm%2Feasy-rpc" "/workspace/builds/worker-5/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/metaworm/easy-rpc on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/metaworm/easy-rpc
[INFO] finished tweaking git repo https://github.com/metaworm/easy-rpc
[INFO] tweaked toml for git repo https://github.com/metaworm/easy-rpc written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/metaworm/easy-rpc already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"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" "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] bb83b4568264e2c402791fe3c3baf152d5737b5a05a33ca0c8d99d5abd0c41d1
[INFO] running `"docker" "start" "-a" "bb83b4568264e2c402791fe3c3baf152d5737b5a05a33ca0c8d99d5abd0c41d1"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling nix v0.10.0
[INFO] [stderr]    Compiling unicode-normalization v0.1.11
[INFO] [stderr]    Compiling memrange v0.1.3
[INFO] [stderr]    Compiling tokio-executor v0.1.9
[INFO] [stderr]    Compiling serde_bytes v0.11.3
[INFO] [stderr]    Compiling base64 v0.9.3
[INFO] [stderr]    Compiling rmp v0.8.8
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling shared_memory_derive v0.10.0
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling theban_interval_tree v0.7.1
[INFO] [stderr]    Compiling rmpv v0.4.2
[INFO] [stderr]    Compiling rmp-serde v0.14.2
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling tokio-reactor v0.1.11
[INFO] [stderr]    Compiling tokio-codec v0.1.1
[INFO] [stderr]    Compiling idna v0.1.5
[INFO] [stderr]    Compiling url v1.7.2
[INFO] [stderr]    Compiling tokio-tcp v0.1.3
[INFO] [stderr]    Compiling websocket-base v0.24.0
[INFO] [stderr]    Compiling hyper v0.10.16
[INFO] [stderr]    Compiling shared_memory v0.10.0
[INFO] [stderr]    Compiling websocket v0.24.0
[INFO] [stderr]    Compiling easy-rpc v0.1.0 (/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(unboxed_closures, fn_traits)]
[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 `easy-rpc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "bb83b4568264e2c402791fe3c3baf152d5737b5a05a33ca0c8d99d5abd0c41d1"`
[INFO] running `"docker" "rm" "-f" "bb83b4568264e2c402791fe3c3baf152d5737b5a05a33ca0c8d99d5abd0c41d1"`
[INFO] [stdout] bb83b4568264e2c402791fe3c3baf152d5737b5a05a33ca0c8d99d5abd0c41d1