[INFO] fetching crate syndicate-server 0.24.0...
[INFO] testing syndicate-server-0.24.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate syndicate-server 0.24.0 into /workspace/builds/worker-119/source
[INFO] validating manifest of crates.io crate syndicate-server 0.24.0 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 crates.io crate syndicate-server 0.24.0
[INFO] finished tweaking crates.io crate syndicate-server 0.24.0
[INFO] tweaked toml for crates.io crate syndicate-server 0.24.0 written to /workspace/builds/worker-119/source/Cargo.toml
[INFO] crate crates.io crate syndicate-server 0.24.0 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 }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-119/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-119/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] fb0c3aa3dfc1c9ed93d463e3a940aed9884490a1de3ba9ab385a743979520c54
[INFO] running `Command { std: "docker" "start" "-a" "fb0c3aa3dfc1c9ed93d463e3a940aed9884490a1de3ba9ab385a743979520c54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fb0c3aa3dfc1c9ed93d463e3a940aed9884490a1de3ba9ab385a743979520c54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb0c3aa3dfc1c9ed93d463e3a940aed9884490a1de3ba9ab385a743979520c54", kill_on_drop: false }`
[INFO] [stdout] fb0c3aa3dfc1c9ed93d463e3a940aed9884490a1de3ba9ab385a743979520c54
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-119/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-119/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] 81c51980a5fbb8740df39e48b7001c4bc55f8fdb069197c0178f11e6d6d71b60
[INFO] running `Command { std: "docker" "start" "-a" "81c51980a5fbb8740df39e48b7001c4bc55f8fdb069197c0178f11e6d6d71b60", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
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[INFO] [stderr]    Compiling rand_chacha v0.3.1
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[INFO] [stderr]    Compiling block-buffer v0.9.0
[INFO] [stderr]    Compiling crypto-mac v0.11.1
[INFO] [stderr]    Compiling num-complex v0.4.0
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling hmac v0.11.0
[INFO] [stderr]    Compiling sha2 v0.9.9
[INFO] [stderr]    Compiling sha-1 v0.9.8
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling mio-extras v2.0.6
[INFO] [stderr]    Compiling notify v4.0.17
[INFO] [stderr]    Compiling num v0.4.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]    Compiling futures-macro v0.3.21
[INFO] [stderr]    Compiling tracing-attributes v0.1.19
[INFO] [stderr]    Compiling pin-project-internal v1.0.10
[INFO] [stderr]    Compiling tokio-macros v1.7.0
[INFO] [stderr]    Compiling tokio v1.16.1
[INFO] [stderr]    Compiling structopt v0.3.26
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling pin-project v1.0.10
[INFO] [stderr]    Compiling tungstenite v0.13.0
[INFO] [stderr]    Compiling tracing v0.1.30
[INFO] [stderr]    Compiling tracing-futures v0.2.5
[INFO] [stderr]    Compiling futures-executor v0.3.21
[INFO] [stderr]    Compiling futures v0.3.21
[INFO] [stderr]    Compiling tokio-util v0.6.9
[INFO] [stderr]    Compiling tokio-tungstenite v0.14.0
[INFO] [stderr]    Compiling serde_bytes v0.11.5
[INFO] [stderr]    Compiling tracing-serde v0.1.3
[INFO] [stderr]    Compiling preserves v2.3.0
[INFO] [stderr]    Compiling tracing-subscriber v0.2.25
[INFO] [stderr]    Compiling preserves-schema v2.4.0
[INFO] [stderr]    Compiling syndicate v0.23.0
[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/syndicate-0.23.0/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(min_specialization)]
[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 `syndicate` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "81c51980a5fbb8740df39e48b7001c4bc55f8fdb069197c0178f11e6d6d71b60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "81c51980a5fbb8740df39e48b7001c4bc55f8fdb069197c0178f11e6d6d71b60", kill_on_drop: false }`
[INFO] [stdout] 81c51980a5fbb8740df39e48b7001c4bc55f8fdb069197c0178f11e6d6d71b60