[INFO] fetching crate juliex 0.3.0-alpha.8...
[INFO] checking juliex-0.3.0-alpha.8 against 1.95.0 for pr-155915
[INFO] extracting crate juliex 0.3.0-alpha.8 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate juliex 0.3.0-alpha.8
[INFO] finished tweaking crates.io crate juliex 0.3.0-alpha.8
[INFO] tweaked toml for crates.io crate juliex 0.3.0-alpha.8 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate juliex 0.3.0-alpha.8 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate juliex 0.3.0-alpha.8 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded lazy_static v1.2.0
[INFO] [stderr]   Downloaded cfg-if v0.1.6
[INFO] [stderr]   Downloaded proc-macro-nested v0.1.3
[INFO] [stderr]   Downloaded rand_os v0.1.2
[INFO] [stderr]   Downloaded async-ready v2.1.0
[INFO] [stderr]   Downloaded async-datagram v2.2.0
[INFO] [stderr]   Downloaded crossbeam v0.7.2
[INFO] [stderr]   Downloaded futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded proc-macro-hack v0.5.7
[INFO] [stderr]   Downloaded futures-select-macro-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded pin-utils v0.1.0-alpha.4
[INFO] [stderr]   Downloaded futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-channel-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-util-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded romio v0.3.0-alpha.7
[INFO] [stderr]   Downloaded quote v0.6.12
[INFO] [stderr]   Downloaded getrandom v0.1.3
[INFO] [stderr]   Downloaded rand_core v0.5.0
[INFO] [stderr]   Downloaded futures-executor-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded rand v0.7.0
[INFO] [stderr]   Downloaded syn v0.15.34
[INFO] [stderr]   Downloaded libc v0.2.60
[INFO] [stderr]   Downloaded winapi v0.3.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 48d8f6eae4c52c9f9be77235a02bf3b7b1793bfae2ef91c29408b3302fc1e502
[INFO] running `Command { std: "docker" "start" "-a" "48d8f6eae4c52c9f9be77235a02bf3b7b1793bfae2ef91c29408b3302fc1e502", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "48d8f6eae4c52c9f9be77235a02bf3b7b1793bfae2ef91c29408b3302fc1e502", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48d8f6eae4c52c9f9be77235a02bf3b7b1793bfae2ef91c29408b3302fc1e502", kill_on_drop: false }`
[INFO] [stdout] 48d8f6eae4c52c9f9be77235a02bf3b7b1793bfae2ef91c29408b3302fc1e502
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c2db305a9ec8ec6488504728b309305027bb69370f33d7bdc1ea60f6b01141ff
[INFO] running `Command { std: "docker" "start" "-a" "c2db305a9ec8ec6488504728b309305027bb69370f33d7bdc1ea60f6b01141ff", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]     Checking lazy_static v1.2.0
[INFO] [stderr]     Checking rand_core v0.4.0
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]     Checking cfg-if v0.1.6
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]     Checking ppv-lite86 v0.2.5
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]    Compiling proc-macro-nested v0.1.3
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling memoffset v0.5.1
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking getrandom v0.1.3
[INFO] [stderr]     Checking num_cpus v1.10.0
[INFO] [stderr]     Checking rand_os v0.1.2
[INFO] [stderr]     Checking rand_jitter v0.1.3
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]     Checking stable_deref_trait v1.1.1
[INFO] [stderr]     Checking owning_ref v0.4.0
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]     Checking rand_core v0.5.0
[INFO] [stderr]     Checking crossbeam-epoch v0.7.2
[INFO] [stderr]     Checking smallvec v0.6.9
[INFO] [stderr]     Checking lazycell v1.2.1
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking lock_api v0.1.5
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking crossbeam-channel v0.3.9
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking async-ready v2.1.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/async-ready-2.1.0/src/lib.rs:42:1
[INFO] [stdout]    |
[INFO] [stdout] 42 | #![feature(futures_api)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `async-ready` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "c2db305a9ec8ec6488504728b309305027bb69370f33d7bdc1ea60f6b01141ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c2db305a9ec8ec6488504728b309305027bb69370f33d7bdc1ea60f6b01141ff", kill_on_drop: false }`
[INFO] [stdout] c2db305a9ec8ec6488504728b309305027bb69370f33d7bdc1ea60f6b01141ff
