[INFO] fetching crate jsons 0.1.5...
[INFO] testing jsons-0.1.5 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate jsons 0.1.5 into /workspace/builds/worker-20/source
[INFO] validating manifest of crates.io crate jsons 0.1.5 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 jsons 0.1.5
[INFO] finished tweaking crates.io crate jsons 0.1.5
[INFO] tweaked toml for crates.io crate jsons 0.1.5 written to /workspace/builds/worker-20/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] af31aa785eb35c75ca1727be9bba29bafb91f8e8bdecfd1b5275f06839eca54d
[INFO] running `Command { std: "docker" "start" "-a" "af31aa785eb35c75ca1727be9bba29bafb91f8e8bdecfd1b5275f06839eca54d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "af31aa785eb35c75ca1727be9bba29bafb91f8e8bdecfd1b5275f06839eca54d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af31aa785eb35c75ca1727be9bba29bafb91f8e8bdecfd1b5275f06839eca54d", kill_on_drop: false }`
[INFO] [stdout] af31aa785eb35c75ca1727be9bba29bafb91f8e8bdecfd1b5275f06839eca54d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] c723865926cf220ed0cf94b932bb1bd588060f3a2e9759980a6884c4d2ce6b99
[INFO] running `Command { std: "docker" "start" "-a" "c723865926cf220ed0cf94b932bb1bd588060f3a2e9759980a6884c4d2ce6b99", kill_on_drop: false }`
[INFO] [stderr]    Compiling jsons v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(array_value_iter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `array_value_iter` has been stable since 1.51.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(array_value_iter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `jsons` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "c723865926cf220ed0cf94b932bb1bd588060f3a2e9759980a6884c4d2ce6b99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c723865926cf220ed0cf94b932bb1bd588060f3a2e9759980a6884c4d2ce6b99", kill_on_drop: false }`
[INFO] [stdout] c723865926cf220ed0cf94b932bb1bd588060f3a2e9759980a6884c4d2ce6b99