[INFO] crate flx 0.2.2 is already in cache
[INFO] testing flx-0.2.2 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate flx 0.2.2 into /workspace/builds/worker-77/source
[INFO] validating manifest of crates.io crate flx 0.2.2 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 flx 0.2.2
[INFO] finished tweaking crates.io crate flx 0.2.2
[INFO] tweaked toml for crates.io crate flx 0.2.2 written to /workspace/builds/worker-77/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] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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] 0f80c2c31f7e10111aff9a020ebeae80959fe7f2d50216a9f9aa4c2d26e6c945
[INFO] running `Command { std: "docker" "start" "-a" "0f80c2c31f7e10111aff9a020ebeae80959fe7f2d50216a9f9aa4c2d26e6c945", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0f80c2c31f7e10111aff9a020ebeae80959fe7f2d50216a9f9aa4c2d26e6c945", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f80c2c31f7e10111aff9a020ebeae80959fe7f2d50216a9f9aa4c2d26e6c945", kill_on_drop: false }`
[INFO] [stdout] 0f80c2c31f7e10111aff9a020ebeae80959fe7f2d50216a9f9aa4c2d26e6c945
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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] 4d28fb35a4b3fa536357d7431206ffe07a8963ebc286945d290738f60f1335c1
[INFO] running `Command { std: "docker" "start" "-a" "4d28fb35a4b3fa536357d7431206ffe07a8963ebc286945d290738f60f1335c1", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling tinyvec_macros v0.1.0
[INFO] [stderr]    Compiling tinyvec v1.5.1
[INFO] [stderr]    Compiling unicode-normalization v0.1.19
[INFO] [stderr]    Compiling flx v0.2.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.19s
[INFO] running `Command { std: "docker" "inspect" "4d28fb35a4b3fa536357d7431206ffe07a8963ebc286945d290738f60f1335c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d28fb35a4b3fa536357d7431206ffe07a8963ebc286945d290738f60f1335c1", kill_on_drop: false }`
[INFO] [stdout] 4d28fb35a4b3fa536357d7431206ffe07a8963ebc286945d290738f60f1335c1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3c1bcb642f0008b0d99dfe344e9bf78b6e0517ffab779c35383fe80b918f3eab
[INFO] running `Command { std: "docker" "start" "-a" "3c1bcb642f0008b0d99dfe344e9bf78b6e0517ffab779c35383fe80b918f3eab", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.123
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling flx v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:7:27
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![cfg_attr(test, feature(test))]
[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 `flx` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "3c1bcb642f0008b0d99dfe344e9bf78b6e0517ffab779c35383fe80b918f3eab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c1bcb642f0008b0d99dfe344e9bf78b6e0517ffab779c35383fe80b918f3eab", kill_on_drop: false }`
[INFO] [stdout] 3c1bcb642f0008b0d99dfe344e9bf78b6e0517ffab779c35383fe80b918f3eab