[INFO] fetching crate unmp-link-redis 0.7.0...
[INFO] testing unmp-link-redis-0.7.0 against 1.99.0-beta.8+cargoflags=--release for beta-release-1.100-2
[INFO] extracting crate unmp-link-redis 0.7.0 into /workspace/builds/worker-2-tc1/source
[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-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate unmp-link-redis 0.7.0 on toolchain 1.99.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 145 packages to highest compatible versions
[INFO] [stderr]       Adding redis v0.20.2 (available: v1.7.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded unmp-link v0.7.0
[INFO] [stderr]   Downloaded unmp-id v2.0.0
[INFO] [stderr]   Downloaded fixed-queue v0.3.11
[INFO] [stderr]   Downloaded futures-intrusive v0.4.2
[INFO] [stderr]   Downloaded unmp v0.7.3
[INFO] [stderr]   Downloaded ach-mpmc v0.2.5
[INFO] [stderr]   Downloaded dtoa v0.4.8
[INFO] [stderr]   Downloaded cortex-m v0.7.9
[INFO] [stderr]   Downloaded xtensa-lx v0.13.0
[INFO] [stderr]   Downloaded cortex-m-macros v0.7.8
[INFO] [stderr]   Downloaded spin_loop v0.2.5
[INFO] [stderr]   Downloaded interrupt v0.1.4
[INFO] [stderr]   Downloaded riscv-macros v0.4.1
[INFO] [stderr]   Downloaded msp430 v0.4.1
[INFO] [stderr]   Downloaded bare-metal v1.0.0
[INFO] [stderr]   Downloaded combine v4.6.9
[INFO] [stderr]   Downloaded ach-ring v0.2.5
[INFO] [stderr]   Downloaded riscv-types v0.1.0
[INFO] [stderr]   Downloaded vcell v0.1.3
[INFO] [stderr]   Downloaded crc16 v0.4.0
[INFO] [stderr]   Downloaded ach-util v0.2.5
[INFO] [stderr]   Downloaded volatile-register v0.2.2
[INFO] [stderr]   Downloaded bare-metal v0.2.5
[INFO] [stderr]   Downloaded task-stream v0.3.8
[INFO] [stderr]   Downloaded bitfield v0.13.2
[INFO] [stderr]   Downloaded riscv v0.16.1
[INFO] [stderr]   Downloaded redis v0.20.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] e10e6f2b5d18e3d01e91e25c74bb815a47b7f2cd63eabf872472bcd14d77c627
[INFO] running `Command { std: "docker" "start" "e10e6f2b5d18e3d01e91e25c74bb815a47b7f2cd63eabf872472bcd14d77c627", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e10e6f2b5d18e3d01e91e25c74bb815a47b7f2cd63eabf872472bcd14d77c627", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "e10e6f2b5d18e3d01e91e25c74bb815a47b7f2cd63eabf872472bcd14d77c627" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e10e6f2b5d18e3d01e91e25c74bb815a47b7f2cd63eabf872472bcd14d77c627", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "e10e6f2b5d18e3d01e91e25c74bb815a47b7f2cd63eabf872472bcd14d77c627" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v3.0.9
[INFO] [stderr]    Compiling futures-core v0.3.34
[INFO] [stderr]    Compiling parking v2.2.1
[INFO] [stderr]    Compiling futures-io v0.3.34
[INFO] [stderr]    Compiling rustix v1.1.5
[INFO] [stderr]    Compiling async-task v4.7.1
[INFO] [stderr]    Compiling litemap v0.8.3
[INFO] [stderr]    Compiling writeable v0.6.4
[INFO] [stderr]    Compiling linux-raw-sys v0.12.1
[INFO] [stderr]    Compiling async-io v2.6.0
[INFO] [stderr]    Compiling icu_properties_data v2.3.0
[INFO] [stderr]    Compiling futures-sink v0.3.34
[INFO] [stderr]    Compiling icu_normalizer_data v2.3.0
[INFO] [stderr]    Compiling value-bag v1.14.1
[INFO] [stderr]    Compiling concurrent-queue v2.5.0
[INFO] [stderr]    Compiling spin_loop v0.2.5
[INFO] [stderr]    Compiling smallvec v1.16.3
[INFO] [stderr]    Compiling tokio v1.53.3
[INFO] [stderr]    Compiling event-listener v5.4.2
[INFO] [stderr]    Compiling futures-lite v2.6.1
[INFO] [stderr]    Compiling piper v0.2.5
[INFO] [stderr]    Compiling futures-task v0.3.34
[INFO] [stderr]    Compiling event-listener v2.5.3
[INFO] [stderr]    Compiling crc16 v0.4.0
[INFO] [stderr]    Compiling spin v0.9.9
[INFO] [stderr]    Compiling futures-intrusive v0.4.2
[INFO] [stderr]    Compiling futures-util v0.3.34
[INFO] [stderr]    Compiling pin-utils v0.1.1
[INFO] [stderr]    Compiling fixed-queue v0.3.11
[INFO] [stderr]    Compiling sha1_smol v1.0.1
[INFO] [stderr]    Compiling getrandom v0.2.17
[INFO] [stderr]    Compiling event-listener-strategy v0.5.4
[INFO] [stderr]    Compiling async-channel v1.9.0
[INFO] [stderr]    Compiling dtoa v0.4.8
[INFO] [stderr]    Compiling itoa v0.4.8
[INFO] [stderr]    Compiling unmp-id v2.0.0
[INFO] [stderr]    Compiling async-channel v2.5.0
[INFO] [stderr]    Compiling async-lock v3.4.2
[INFO] [stderr]    Compiling log v0.4.34
[INFO] [stderr]    Compiling sha1 v0.6.1
[INFO] [stderr]    Compiling 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/index.crates.io-1949cf8c6b5b557f/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] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `unmp-link` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "e10e6f2b5d18e3d01e91e25c74bb815a47b7f2cd63eabf872472bcd14d77c627", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e10e6f2b5d18e3d01e91e25c74bb815a47b7f2cd63eabf872472bcd14d77c627", kill_on_drop: false }`
[INFO] [stdout] e10e6f2b5d18e3d01e91e25c74bb815a47b7f2cd63eabf872472bcd14d77c627
