[INFO] cloning repository https://github.com/jlricon/rlinks
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jlricon/rlinks" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjlricon%2Frlinks", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjlricon%2Frlinks'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f39102c47e45b875a008756cdc87a590ff5f58c1
[INFO] checking jlricon/rlinks against 1.55.0 for beta-1.56-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjlricon%2Frlinks" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jlricon/rlinks on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jlricon/rlinks
[INFO] finished tweaking git repo https://github.com/jlricon/rlinks
[INFO] tweaked toml for git repo https://github.com/jlricon/rlinks written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/jlricon/rlinks already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1531bd156610a2b325c2d31549b6004ec1fcafc8e81a96f0aac8e420b1f90123
[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" "1531bd156610a2b325c2d31549b6004ec1fcafc8e81a96f0aac8e420b1f90123", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1531bd156610a2b325c2d31549b6004ec1fcafc8e81a96f0aac8e420b1f90123", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1531bd156610a2b325c2d31549b6004ec1fcafc8e81a96f0aac8e420b1f90123", kill_on_drop: false }`
[INFO] [stdout] 1531bd156610a2b325c2d31549b6004ec1fcafc8e81a96f0aac8e420b1f90123
[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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--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] 0164d0bce990202fb08d4b37525597fe6b9d85656668c9a90520371bcbb4cf80
[INFO] running `Command { std: "docker" "start" "-a" "0164d0bce990202fb08d4b37525597fe6b9d85656668c9a90520371bcbb4cf80", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.42
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling getrandom v0.1.11
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking ppv-lite86 v0.2.5
[INFO] [stderr]    Compiling itoa v0.4.4
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling curl v0.4.23
[INFO] [stderr]     Checking bit-vec v0.5.1
[INFO] [stderr]    Compiling isahc v0.7.3
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]     Checking lock_api v0.3.1
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]    Compiling serde v1.0.99
[INFO] [stderr]    Compiling ryu v1.0.0
[INFO] [stderr]     Checking tendril v0.4.1
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking socket2 v0.3.11
[INFO] [stderr]     Checking termios v0.3.1
[INFO] [stderr]     Checking clicolors-control v1.0.1
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking bit-set v0.5.1
[INFO] [stderr]     Checking clap v2.33.1
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking number_prefix v0.2.8
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]    Compiling proc-macro-hack v0.5.9
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.18
[INFO] [stderr]     Checking parking_lot_core v0.6.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking sluice v0.4.2
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]     Checking parking_lot v0.9.0
[INFO] [stderr]     Checking http v0.1.18
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]    Compiling openssl-sys v0.9.49
[INFO] [stderr]    Compiling libnghttp2-sys v0.1.2
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling curl-sys v0.4.21
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stderr]     Checking chrono v0.4.9
[INFO] [stderr]     Checking console v0.8.0
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]     Checking indicatif v0.11.0
[INFO] [stderr]    Compiling string_cache_codegen v0.4.2
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling string_cache v0.7.3
[INFO] [stderr]    Compiling serde_json v1.0.40
[INFO] [stderr]    Compiling markup5ever v0.8.1
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling futures-join-macro-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling html5ever v0.23.0
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.18
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/futures-util-preview-0.3.0-alpha.18/src/lib.rs:4:38
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![cfg_attr(feature = "async-await", feature(async_await))]
[INFO] [stdout]   |                                      ^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[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 `futures-util-preview` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "0164d0bce990202fb08d4b37525597fe6b9d85656668c9a90520371bcbb4cf80", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0164d0bce990202fb08d4b37525597fe6b9d85656668c9a90520371bcbb4cf80", kill_on_drop: false }`
[INFO] [stdout] 0164d0bce990202fb08d4b37525597fe6b9d85656668c9a90520371bcbb4cf80
