[INFO] fetching crate mantle 0.2.1...
[INFO] testing mantle-0.2.1 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate mantle 0.2.1 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate mantle 0.2.1 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mantle 0.2.1
[INFO] finished tweaking crates.io crate mantle 0.2.1
[INFO] tweaked toml for crates.io crate mantle 0.2.1 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde_cbor v0.10.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3bbe3b84fc9d09ad262891b7954e1007bc3adb49e35de7099094a290fab751a1
[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" "3bbe3b84fc9d09ad262891b7954e1007bc3adb49e35de7099094a290fab751a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3bbe3b84fc9d09ad262891b7954e1007bc3adb49e35de7099094a290fab751a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3bbe3b84fc9d09ad262891b7954e1007bc3adb49e35de7099094a290fab751a1", kill_on_drop: false }`
[INFO] [stdout] 3bbe3b84fc9d09ad262891b7954e1007bc3adb49e35de7099094a290fab751a1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a61298bcfe198f97cf21453437926d634f549b8e1e9a0e5fd7c11ae133796df9
[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" "a61298bcfe198f97cf21453437926d634f549b8e1e9a0e5fd7c11ae133796df9", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling half v1.7.1
[INFO] [stderr]    Compiling hex v0.3.2
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]    Compiling object v0.26.0
[INFO] [stderr]    Compiling proc-quote-impl v0.2.2
[INFO] [stderr]    Compiling thiserror-impl v1.0.26
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling tiny-keccak v1.5.0
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling thiserror v1.0.26
[INFO] [stderr]    Compiling backtrace v0.3.61
[INFO] [stderr]    Compiling serde_cbor v0.10.2
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling proc-quote v0.2.2
[INFO] [stderr]    Compiling derive_more v0.15.0
[INFO] [stderr]    Compiling mantle-macros v0.2.1
[INFO] [stderr]    Compiling default-env v0.1.1
[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/mantle-macros-0.2.1/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_diagnostic, type_ascription)]
[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 `mantle-macros` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "a61298bcfe198f97cf21453437926d634f549b8e1e9a0e5fd7c11ae133796df9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a61298bcfe198f97cf21453437926d634f549b8e1e9a0e5fd7c11ae133796df9", kill_on_drop: false }`
[INFO] [stdout] a61298bcfe198f97cf21453437926d634f549b8e1e9a0e5fd7c11ae133796df9
