[INFO] fetching crate tower-async-bridge 0.2.0...
[INFO] testing tower-async-bridge-0.2.0 against 1.75.0 for beta-1.76-1
[INFO] extracting crate tower-async-bridge 0.2.0 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate tower-async-bridge 0.2.0 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tower-async-bridge 0.2.0
[INFO] finished tweaking crates.io crate tower-async-bridge 0.2.0
[INFO] tweaked toml for crates.io crate tower-async-bridge 0.2.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded hdrhistogram v7.5.4
[INFO] [stderr]   Downloaded tower-async-service v0.2.0
[INFO] [stderr]   Downloaded tower-async-layer v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7d96d12e06a2b808d2b34fa2c32618be9abaa6f41d86025fd62b8b31844a73a4
[INFO] running `Command { std: "docker" "start" "-a" "7d96d12e06a2b808d2b34fa2c32618be9abaa6f41d86025fd62b8b31844a73a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7d96d12e06a2b808d2b34fa2c32618be9abaa6f41d86025fd62b8b31844a73a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d96d12e06a2b808d2b34fa2c32618be9abaa6f41d86025fd62b8b31844a73a4", kill_on_drop: false }`
[INFO] [stdout] 7d96d12e06a2b808d2b34fa2c32618be9abaa6f41d86025fd62b8b31844a73a4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 57a3777dc2cf865861d6985456b7a7e949989223c8404d065503f1088d96b28c
[INFO] running `Command { std: "docker" "start" "-a" "57a3777dc2cf865861d6985456b7a7e949989223c8404d065503f1088d96b28c", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.18
[INFO] [stderr]    Compiling parking v2.2.0
[INFO] [stderr]    Compiling tower-async-service v0.2.0
[INFO] [stderr]    Compiling tower-service v0.3.2
[INFO] [stderr]    Compiling tower-layer v0.3.2
[INFO] [stderr]    Compiling tower-async-layer v0.2.0
[INFO] [stderr]    Compiling concurrent-queue v2.4.0
[INFO] [stderr]    Compiling event-listener v4.0.2
[INFO] [stderr]    Compiling event-listener-strategy v0.4.0
[INFO] [stderr]    Compiling async-lock v3.2.0
[INFO] [stderr]    Compiling tower-async-bridge v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(associated_type_bounds)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(return_type_notation)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tower-async-bridge` (lib) due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "57a3777dc2cf865861d6985456b7a7e949989223c8404d065503f1088d96b28c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57a3777dc2cf865861d6985456b7a7e949989223c8404d065503f1088d96b28c", kill_on_drop: false }`
[INFO] [stdout] 57a3777dc2cf865861d6985456b7a7e949989223c8404d065503f1088d96b28c
