[INFO] fetching crate tiered-result 0.1.0...
[INFO] testing tiered-result-0.1.0 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate tiered-result 0.1.0 into /workspace/builds/worker-101/source
[INFO] validating manifest of crates.io crate tiered-result 0.1.0 on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tiered-result 0.1.0
[INFO] finished tweaking crates.io crate tiered-result 0.1.0
[INFO] tweaked toml for crates.io crate tiered-result 0.1.0 written to /workspace/builds/worker-101/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "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-2022-02-22" "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 nullable-result v0.7.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c0f95a8ad8abd239cc534244d2898fb98f12fe1905c6f1be701bbd720c3764eb
[INFO] running `Command { std: "docker" "start" "-a" "c0f95a8ad8abd239cc534244d2898fb98f12fe1905c6f1be701bbd720c3764eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c0f95a8ad8abd239cc534244d2898fb98f12fe1905c6f1be701bbd720c3764eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0f95a8ad8abd239cc534244d2898fb98f12fe1905c6f1be701bbd720c3764eb", kill_on_drop: false }`
[INFO] [stdout] c0f95a8ad8abd239cc534244d2898fb98f12fe1905c6f1be701bbd720c3764eb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 53d4faff1b6c785944f26f95eb759c0f79ce828ecd5a671cbe04078959deed66
[INFO] running `Command { std: "docker" "start" "-a" "53d4faff1b6c785944f26f95eb759c0f79ce828ecd5a671cbe04078959deed66", kill_on_drop: false }`
[INFO] [stderr]    Compiling nullable-result 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/nullable-result-0.7.0/src/lib.rs:11:44
[INFO] [stdout]    |
[INFO] [stdout] 11 | #![cfg_attr(feature = "try_trait", feature(try_trait_v2))]
[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 `nullable-result` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "53d4faff1b6c785944f26f95eb759c0f79ce828ecd5a671cbe04078959deed66", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "53d4faff1b6c785944f26f95eb759c0f79ce828ecd5a671cbe04078959deed66", kill_on_drop: false }`
[INFO] [stdout] 53d4faff1b6c785944f26f95eb759c0f79ce828ecd5a671cbe04078959deed66