[INFO] fetching crate fb_futures_ext 0.1.2...
[INFO] testing fb_futures_ext-0.1.2 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate fb_futures_ext 0.1.2 into /workspace/builds/worker-21/source
[INFO] validating manifest of crates.io crate fb_futures_ext 0.1.2 on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fb_futures_ext 0.1.2
[INFO] finished tweaking crates.io crate fb_futures_ext 0.1.2
[INFO] tweaked toml for crates.io crate fb_futures_ext 0.1.2 written to /workspace/builds/worker-21/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "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-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 398cf99b2773089fd2e6522eef3ae7ea8dc86ee9725300720a6926dea6b4669c
[INFO] running `Command { std: "docker" "start" "-a" "398cf99b2773089fd2e6522eef3ae7ea8dc86ee9725300720a6926dea6b4669c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "398cf99b2773089fd2e6522eef3ae7ea8dc86ee9725300720a6926dea6b4669c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "398cf99b2773089fd2e6522eef3ae7ea8dc86ee9725300720a6926dea6b4669c", kill_on_drop: false }`
[INFO] [stdout] 398cf99b2773089fd2e6522eef3ae7ea8dc86ee9725300720a6926dea6b4669c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 024dab101b56e4c5ae4073978c51c463c9b920c460cd12791439011b39b2dc01
[INFO] running `Command { std: "docker" "start" "-a" "024dab101b56e4c5ae4073978c51c463c9b920c460cd12791439011b39b2dc01", kill_on_drop: false }`
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling tokio-io v0.1.13
[INFO] [stderr]    Compiling tokio-reactor v0.1.12
[INFO] [stderr]    Compiling tokio-codec v0.1.2
[INFO] [stderr]    Compiling tokio-fs v0.1.7
[INFO] [stderr]    Compiling tokio-uds v0.2.7
[INFO] [stderr]    Compiling tokio-tcp v0.1.4
[INFO] [stderr]    Compiling tokio-udp v0.1.6
[INFO] [stderr]    Compiling tokio v0.1.22
[INFO] [stderr]    Compiling fb_futures_ext v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:11:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![feature(never_type)]
[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 `fb_futures_ext` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "024dab101b56e4c5ae4073978c51c463c9b920c460cd12791439011b39b2dc01", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "024dab101b56e4c5ae4073978c51c463c9b920c460cd12791439011b39b2dc01", kill_on_drop: false }`
[INFO] [stdout] 024dab101b56e4c5ae4073978c51c463c9b920c460cd12791439011b39b2dc01