[INFO] fetching crate loadstone 1.0.0...
[INFO] testing loadstone-1.0.0 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate loadstone 1.0.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate loadstone 1.0.0 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] removed /workspace/builds/worker-4/source/.cargo/config
[INFO] started tweaking crates.io crate loadstone 1.0.0
[INFO] finished tweaking crates.io crate loadstone 1.0.0
[INFO] tweaked toml for crates.io crate loadstone 1.0.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate loadstone 1.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 3c5796f688d68143794312bd5a8ed5369654098640463b3d1b34c555e4982e8b
[INFO] running `Command { std: "docker" "start" "-a" "3c5796f688d68143794312bd5a8ed5369654098640463b3d1b34c555e4982e8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3c5796f688d68143794312bd5a8ed5369654098640463b3d1b34c555e4982e8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c5796f688d68143794312bd5a8ed5369654098640463b3d1b34c555e4982e8b", kill_on_drop: false }`
[INFO] [stdout] 3c5796f688d68143794312bd5a8ed5369654098640463b3d1b34c555e4982e8b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] ef95e3d9ddcd83a35968a05a6a8c46d828ee82e234563235d9e6e45510bc2e5c
[INFO] running `Command { std: "docker" "start" "-a" "ef95e3d9ddcd83a35968a05a6a8c46d828ee82e234563235d9e6e45510bc2e5c", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling radium v0.6.2
[INFO] [stderr]    Compiling cortex-m v0.7.2
[INFO] [stderr]    Compiling subtle v2.4.0
[INFO] [stderr]    Compiling funty v1.1.0
[INFO] [stderr]    Compiling nb v1.0.0
[INFO] [stderr]    Compiling const-oid v0.5.2
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling rand_core v0.6.2
[INFO] [stderr]    Compiling wyz v0.2.0
[INFO] [stderr]    Compiling tap v1.0.1
[INFO] [stderr]    Compiling vcell v0.1.3
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling base64ct v1.0.0
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling bitfield v0.13.2
[INFO] [stderr]    Compiling zeroize v1.3.0
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling cpufeatures v0.1.4
[INFO] [stderr]    Compiling cortex-m v0.6.7
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling paste v1.0.5
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling opaque-debug v0.3.0
[INFO] [stderr]    Compiling anyhow v1.0.40
[INFO] [stderr]    Compiling defmt-parser v0.2.1
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling cortex-m-semihosting v0.3.7
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling build_const v0.2.2
[INFO] [stderr]    Compiling base64 v0.13.0
[INFO] [stderr]    Compiling cortex-m-rt v0.6.14
[INFO] [stderr]    Compiling r0 v0.2.2
[INFO] [stderr]    Compiling ufmt-write v0.1.0
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling linked_list_allocator v0.8.11
[INFO] [stderr]    Compiling bytemuck v1.5.1
[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/linked_list_allocator-0.8.11/src/lib.rs:1:41
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "const_mut_refs", feature(const_mut_refs))]
[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 `linked_list_allocator` 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" "ef95e3d9ddcd83a35968a05a6a8c46d828ee82e234563235d9e6e45510bc2e5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef95e3d9ddcd83a35968a05a6a8c46d828ee82e234563235d9e6e45510bc2e5c", kill_on_drop: false }`
[INFO] [stdout] ef95e3d9ddcd83a35968a05a6a8c46d828ee82e234563235d9e6e45510bc2e5c
