[INFO] cloning repository https://github.com/japaric/xargo
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/japaric/xargo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaparic%2Fxargo"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaparic%2Fxargo'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 14141603edd46920c24d0713f1f082c2acac8fda
[INFO] testing japaric/xargo against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjaparic%2Fxargo" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/japaric/xargo 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/japaric/xargo
[INFO] finished tweaking git repo https://github.com/japaric/xargo
[INFO] tweaked toml for git repo https://github.com/japaric/xargo written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/japaric/xargo 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] 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] 6d9b5dcb1bcdfacf8fb1151ae0ab2d870ca0d4c545a3523903407a1639088b5d
[INFO] running `"docker" "start" "-a" "6d9b5dcb1bcdfacf8fb1151ae0ab2d870ca0d4c545a3523903407a1639088b5d"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling libc v0.2.68
[INFO] [stderr]    Compiling same-file v0.1.3
[INFO] [stderr]    Compiling xargo v0.3.20 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling dtoa v0.2.2
[INFO] [stderr]    Compiling semver v0.1.20
[INFO] [stderr]    Compiling serde v0.8.23
[INFO] [stderr]    Compiling itoa v0.1.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.35
[INFO] [stderr]    Compiling toml v0.2.1
[INFO] [stderr]    Compiling walkdir v1.0.7
[INFO] [stderr]    Compiling rustc_version v0.1.7
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling fs2 v0.4.3
[INFO] [stderr]    Compiling backtrace v0.3.46
[INFO] [stderr]    Compiling error-chain v0.7.2
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling serde_json v0.8.6
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.79s
[INFO] running `"docker" "inspect" "6d9b5dcb1bcdfacf8fb1151ae0ab2d870ca0d4c545a3523903407a1639088b5d"`
[INFO] running `"docker" "rm" "-f" "6d9b5dcb1bcdfacf8fb1151ae0ab2d870ca0d4c545a3523903407a1639088b5d"`
[INFO] [stdout] 6d9b5dcb1bcdfacf8fb1151ae0ab2d870ca0d4c545a3523903407a1639088b5d
[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" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 89c1ef1491247c69df1f251374c435a8a75deaae1db08d7f8affc2a9375b9432
[INFO] running `"docker" "start" "-a" "89c1ef1491247c69df1f251374c435a8a75deaae1db08d7f8affc2a9375b9432"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling owning_ref v0.2.4
[INFO] [stderr]    Compiling thread-id v3.3.0
[INFO] [stderr]    Compiling parking_lot_core v0.2.14
[INFO] [stderr]    Compiling parking_lot v0.3.8
[INFO] [stderr]    Compiling xargo v0.3.20 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> tests/smoke.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(const_fn)]
[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 `xargo`.
[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" "89c1ef1491247c69df1f251374c435a8a75deaae1db08d7f8affc2a9375b9432"`
[INFO] running `"docker" "rm" "-f" "89c1ef1491247c69df1f251374c435a8a75deaae1db08d7f8affc2a9375b9432"`
[INFO] [stdout] 89c1ef1491247c69df1f251374c435a8a75deaae1db08d7f8affc2a9375b9432