[INFO] cloning repository https://github.com/attaca/attaca
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/attaca/attaca" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fattaca%2Fattaca"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fattaca%2Fattaca'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 865df52c16599c50b33e86dbbff115eae772f94a
[INFO] testing attaca/attaca against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fattaca%2Fattaca" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/attaca/attaca 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/attaca/attaca
[INFO] removed workspace from git repo https://github.com/attaca/attaca
[INFO] finished tweaking git repo https://github.com/attaca/attaca
[INFO] tweaked toml for git repo https://github.com/attaca/attaca written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/attaca/attaca 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] error: the lock file /workspace/builds/worker-6/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[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-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" "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] 17757d12c58907519479ab56c83fe43b4f33cba1dad1dc0fdb9a534689178d3e
[INFO] running `"docker" "start" "-a" "17757d12c58907519479ab56c83fe43b4f33cba1dad1dc0fdb9a534689178d3e"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling syn v1.0.30
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling gimli v0.21.0
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling object v0.19.0
[INFO] [stderr]    Compiling arrayref v0.3.6
[INFO] [stderr]    Compiling keccak v0.1.0
[INFO] [stderr]    Compiling futures-await-await-macro v0.1.1
[INFO] [stderr]    Compiling futures v0.1.29
[INFO] [stderr]    Compiling leb128 v0.2.4
[INFO] [stderr]    Compiling uuid v0.6.5
[INFO] [stderr]    Compiling block-buffer v0.3.3
[INFO] [stderr]    Compiling smallvec v0.6.13
[INFO] [stderr]    Compiling im v9.0.0
[INFO] [stderr]    Compiling peg v0.5.7
[INFO] [stderr]    Compiling quote v1.0.6
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling memchr v1.0.2
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling nom v3.2.1
[INFO] [stderr]    Compiling generic-array v0.9.0
[INFO] [stderr]    Compiling chrono v0.4.11
[INFO] [stderr]    Compiling digest v0.7.6
[INFO] [stderr]    Compiling sha3 v0.7.3
[INFO] [stderr]    Compiling ntriple v0.1.1
[INFO] [stderr]    Compiling parking_lot_core v0.2.14
[INFO] [stderr]    Compiling parking_lot v0.5.5
[INFO] [stderr]    Compiling addr2line v0.12.1
[INFO] [stderr]    Compiling backtrace v0.3.48
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling futures-await-async-macro v0.1.4
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/futures-await-async-macro-0.1.4/src/lib.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | #![feature(proc_macro)]
[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 `futures-await-async-macro`.
[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] [stderr] error: build failed
[INFO] running `"docker" "inspect" "17757d12c58907519479ab56c83fe43b4f33cba1dad1dc0fdb9a534689178d3e"`
[INFO] running `"docker" "rm" "-f" "17757d12c58907519479ab56c83fe43b4f33cba1dad1dc0fdb9a534689178d3e"`
[INFO] [stdout] 17757d12c58907519479ab56c83fe43b4f33cba1dad1dc0fdb9a534689178d3e