[INFO] fetching crate linked_list_allocator 0.9.0...
[INFO] testing linked_list_allocator-0.9.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate linked_list_allocator 0.9.0 into /workspace/builds/worker-87/source
[INFO] validating manifest of crates.io crate linked_list_allocator 0.9.0 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-87/source/rust-toolchain
[INFO] started tweaking crates.io crate linked_list_allocator 0.9.0
[INFO] finished tweaking crates.io crate linked_list_allocator 0.9.0
[INFO] tweaked toml for crates.io crate linked_list_allocator 0.9.0 written to /workspace/builds/worker-87/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 12443f3d57239384a634bd35dde1a9941dab6d74cf08ebb9a9b3454ef0df3865
[INFO] running `Command { std: "docker" "start" "-a" "12443f3d57239384a634bd35dde1a9941dab6d74cf08ebb9a9b3454ef0df3865", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "12443f3d57239384a634bd35dde1a9941dab6d74cf08ebb9a9b3454ef0df3865", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12443f3d57239384a634bd35dde1a9941dab6d74cf08ebb9a9b3454ef0df3865", kill_on_drop: false }`
[INFO] [stdout] 12443f3d57239384a634bd35dde1a9941dab6d74cf08ebb9a9b3454ef0df3865
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cd6a7600d882f238399d32db95fe6c873d54a370a563686f69f4368772eda217
[INFO] running `Command { std: "docker" "start" "-a" "cd6a7600d882f238399d32db95fe6c873d54a370a563686f69f4368772eda217", kill_on_drop: false }`
[INFO] [stderr]    Compiling lock_api v0.4.5
[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/lock_api-0.4.5/src/lib.rs:93:34
[INFO] [stdout]    |
[INFO] [stdout] 93 | #![cfg_attr(feature = "nightly", feature(const_fn_trait_bound))]
[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 `lock_api` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "cd6a7600d882f238399d32db95fe6c873d54a370a563686f69f4368772eda217", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd6a7600d882f238399d32db95fe6c873d54a370a563686f69f4368772eda217", kill_on_drop: false }`
[INFO] [stdout] cd6a7600d882f238399d32db95fe6c873d54a370a563686f69f4368772eda217