[INFO] cloning repository https://github.com/LooMaclin/tux_async_example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LooMaclin/tux_async_example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLooMaclin%2Ftux_async_example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLooMaclin%2Ftux_async_example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a42870d0c2d19a9213a03f4c191909d2cce56a64
[INFO] testing LooMaclin/tux_async_example against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLooMaclin%2Ftux_async_example" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/LooMaclin/tux_async_example on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/LooMaclin/tux_async_example
[INFO] finished tweaking git repo https://github.com/LooMaclin/tux_async_example
[INFO] tweaked toml for git repo https://github.com/LooMaclin/tux_async_example written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/LooMaclin/tux_async_example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tokio-async-await v0.1.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ef8c6465a21185b718951bda2573bb46cf8321a0c3e6706bce7f26e217002cf2
[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" "ef8c6465a21185b718951bda2573bb46cf8321a0c3e6706bce7f26e217002cf2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ef8c6465a21185b718951bda2573bb46cf8321a0c3e6706bce7f26e217002cf2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef8c6465a21185b718951bda2573bb46cf8321a0c3e6706bce7f26e217002cf2", kill_on_drop: false }`
[INFO] [stdout] ef8c6465a21185b718951bda2573bb46cf8321a0c3e6706bce7f26e217002cf2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 664812e68e72c2ce2931993fbe780ce3beacafe7cf6488512d6fd697efa59f03
[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" "664812e68e72c2ce2931993fbe780ce3beacafe7cf6488512d6fd697efa59f03", kill_on_drop: false }`
[INFO] [stderr]    Compiling futures v0.1.25
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling num_cpus v1.10.0
[INFO] [stderr]    Compiling bytes v0.4.11
[INFO] [stderr]    Compiling mio v0.6.16
[INFO] [stderr]    Compiling rand_pcg v0.1.1
[INFO] [stderr]    Compiling smallvec v0.6.8
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling crossbeam-channel v0.3.8
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.1
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]    Compiling crossbeam-deque v0.6.3
[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-0.1.25/src/lib.rs:161:42
[INFO] [stdout]     |
[INFO] [stdout] 161 | #![cfg_attr(feature = "nightly", feature(pin))]
[INFO] [stdout]     |                                          ^^^
[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` 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" "664812e68e72c2ce2931993fbe780ce3beacafe7cf6488512d6fd697efa59f03", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "664812e68e72c2ce2931993fbe780ce3beacafe7cf6488512d6fd697efa59f03", kill_on_drop: false }`
[INFO] [stdout] 664812e68e72c2ce2931993fbe780ce3beacafe7cf6488512d6fd697efa59f03