[INFO] fetching crate unmp-link-redis 0.7.0...
[INFO] documenting unmp-link-redis-0.7.0 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate unmp-link-redis 0.7.0 into /workspace/builds/worker-48/source
[INFO] validating manifest of crates.io crate unmp-link-redis 0.7.0 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unmp-link-redis 0.7.0
[INFO] finished tweaking crates.io crate unmp-link-redis 0.7.0
[INFO] tweaked toml for crates.io crate unmp-link-redis 0.7.0 written to /workspace/builds/worker-48/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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 redis v0.20.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a94ba8d288cfb8f5d47491ba83879a07694c207dc2dc62ff2547f17db63020e1
[INFO] running `Command { std: "docker" "start" "-a" "a94ba8d288cfb8f5d47491ba83879a07694c207dc2dc62ff2547f17db63020e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a94ba8d288cfb8f5d47491ba83879a07694c207dc2dc62ff2547f17db63020e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a94ba8d288cfb8f5d47491ba83879a07694c207dc2dc62ff2547f17db63020e1", kill_on_drop: false }`
[INFO] [stdout] a94ba8d288cfb8f5d47491ba83879a07694c207dc2dc62ff2547f17db63020e1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/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" "RUSTDOCFLAGS=--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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 632cca8dd7ab8b717243b9f58169c8e1d56949a5cb34163b3b75e3729efa5a78
[INFO] running `Command { std: "docker" "start" "-a" "632cca8dd7ab8b717243b9f58169c8e1d56949a5cb34163b3b75e3729efa5a78", kill_on_drop: false }`
[INFO] [stderr]    Compiling signal-hook v0.3.9
[INFO] [stderr]    Compiling heapless v0.7.4
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]    Compiling crc16 v0.4.0
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking fixed-queue v0.3.10
[INFO] [stderr]     Checking dtoa v0.4.8
[INFO] [stderr]     Checking sha1 v0.6.0
[INFO] [stderr]     Checking unmp-id v2.0.0
[INFO] [stderr]    Compiling tokio v1.9.0
[INFO] [stderr]    Compiling futures-util v0.3.16
[INFO] [stderr]     Checking futures-lite v1.12.0
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking spin v0.9.2
[INFO] [stderr]     Checking futures-intrusive v0.4.0
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]    Compiling ctor v0.1.20
[INFO] [stderr]    Compiling async-trait v0.1.51
[INFO] [stderr]     Checking hash32 v0.2.1
[INFO] [stderr]     Checking unmp-link v0.7.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/unmp-link-0.7.0/src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(const_btree_new)]
[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 `unmp-link` 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" "632cca8dd7ab8b717243b9f58169c8e1d56949a5cb34163b3b75e3729efa5a78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "632cca8dd7ab8b717243b9f58169c8e1d56949a5cb34163b3b75e3729efa5a78", kill_on_drop: false }`
[INFO] [stdout] 632cca8dd7ab8b717243b9f58169c8e1d56949a5cb34163b3b75e3729efa5a78
