[INFO] fetching crate lemon-tree 0.1.7...
[INFO] testing lemon-tree-0.1.7 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate lemon-tree 0.1.7 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate lemon-tree 0.1.7 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 lemon-tree 0.1.7
[INFO] finished tweaking crates.io crate lemon-tree 0.1.7
[INFO] tweaked toml for crates.io crate lemon-tree 0.1.7 written to /workspace/builds/worker-12/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] 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-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4f111767916b445f41bc484ac60bcf23ae86717950bf5ac43647d4b6f14fc718
[INFO] running `Command { std: "docker" "start" "-a" "4f111767916b445f41bc484ac60bcf23ae86717950bf5ac43647d4b6f14fc718", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4f111767916b445f41bc484ac60bcf23ae86717950bf5ac43647d4b6f14fc718", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f111767916b445f41bc484ac60bcf23ae86717950bf5ac43647d4b6f14fc718", kill_on_drop: false }`
[INFO] [stdout] 4f111767916b445f41bc484ac60bcf23ae86717950bf5ac43647d4b6f14fc718
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 9770f327d2aa62c96b84e5fe908348d451c151ff16db81ac296ceb194adc0ba9
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "9770f327d2aa62c96b84e5fe908348d451c151ff16db81ac296ceb194adc0ba9", kill_on_drop: false }`
[INFO] [stderr]    Compiling lemon-mint v0.1.4
[INFO] [stderr]    Compiling lemon-tree-derive v1.0.4
[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/lemon-tree-derive-1.0.4/src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(proc_macro_span)]
[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 `lemon-tree-derive` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "9770f327d2aa62c96b84e5fe908348d451c151ff16db81ac296ceb194adc0ba9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9770f327d2aa62c96b84e5fe908348d451c151ff16db81ac296ceb194adc0ba9", kill_on_drop: false }`
[INFO] [stdout] 9770f327d2aa62c96b84e5fe908348d451c151ff16db81ac296ceb194adc0ba9