[INFO] fetching crate myanimelist-rs 0.1.0...
[INFO] testing myanimelist-rs-0.1.0 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate myanimelist-rs 0.1.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate myanimelist-rs 0.1.0 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate myanimelist-rs 0.1.0
[INFO] finished tweaking crates.io crate myanimelist-rs 0.1.0
[INFO] tweaked toml for crates.io crate myanimelist-rs 0.1.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate myanimelist-rs 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: file found to be present in multiple build targets: /workspace/builds/worker-7/source/examples/auth.rs
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proc-macro-hack v0.5.16
[INFO] [stderr]   Downloaded core-foundation v0.7.0
[INFO] [stderr]   Downloaded ppv-lite86 v0.2.8
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.64
[INFO] [stderr]   Downloaded syn v1.0.33
[INFO] [stderr]   Downloaded strum_macros v0.18.0
[INFO] [stderr]   Downloaded http v0.2.1
[INFO] [stderr]   Downloaded hyper v0.13.6
[INFO] [stderr]   Downloaded once_cell v1.4.0
[INFO] [stderr]   Downloaded h2 v0.2.5
[INFO] [stderr]   Downloaded standback v0.2.9
[INFO] [stderr]   Downloaded indexmap v1.4.0
[INFO] [stderr]   Downloaded native-tls v0.2.4
[INFO] [stderr]   Downloaded time-macros v0.1.0
[INFO] [stderr]   Downloaded serde_derive v1.0.114
[INFO] [stderr]   Downloaded loom v0.3.4
[INFO] [stderr]   Downloaded wasm-bindgen-futures v0.4.14
[INFO] [stderr]   Downloaded strum v0.18.0
[INFO] [stderr]   Downloaded serde_urlencoded v0.6.1
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.64
[INFO] [stderr]   Downloaded aho-corasick v0.7.13
[INFO] [stderr]   Downloaded serde v1.0.114
[INFO] [stderr]   Downloaded time v0.2.16
[INFO] [stderr]   Downloaded base-x v0.2.6
[INFO] [stderr]   Downloaded bytes v0.5.5
[INFO] [stderr]   Downloaded js-sys v0.3.41
[INFO] [stderr]   Downloaded wasm-bindgen v0.2.64
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.64
[INFO] [stderr]   Downloaded pin-project-internal v0.4.22
[INFO] [stderr]   Downloaded core-foundation-sys v0.7.0
[INFO] [stderr]   Downloaded generator v0.6.21
[INFO] [stderr]   Downloaded libc v0.2.72
[INFO] [stderr]   Downloaded regex-syntax v0.6.18
[INFO] [stderr]   Downloaded web-sys v0.3.41
[INFO] [stderr]   Downloaded cc v1.0.58
[INFO] [stderr]   Downloaded tokio v0.2.21
[INFO] [stderr]   Downloaded proc-macro2 v1.0.18
[INFO] [stderr]   Downloaded encoding_rs v0.8.23
[INFO] [stderr]   Downloaded unicode-normalization v0.1.9
[INFO] [stderr]   Downloaded reqwest v0.10.6
[INFO] [stderr]   Downloaded pin-project v0.4.22
[INFO] [stderr]   Downloaded security-framework v0.4.4
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.64
[INFO] [stderr]   Downloaded serde_json v1.0.56
[INFO] [stderr]   Downloaded security-framework-sys v0.4.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b5638641033fef13c4d48bea41e0ddf6af31cec6c4cb7a1f61d915c726723b24
[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" "b5638641033fef13c4d48bea41e0ddf6af31cec6c4cb7a1f61d915c726723b24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b5638641033fef13c4d48bea41e0ddf6af31cec6c4cb7a1f61d915c726723b24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b5638641033fef13c4d48bea41e0ddf6af31cec6c4cb7a1f61d915c726723b24", kill_on_drop: false }`
[INFO] [stdout] b5638641033fef13c4d48bea41e0ddf6af31cec6c4cb7a1f61d915c726723b24
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 46c1bc468b7eeb9c02cb3a04bb969eb6db6d8419ed5a93ad44ede8f7a6bfbac7
[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" "46c1bc468b7eeb9c02cb3a04bb969eb6db6d8419ed5a93ad44ede8f7a6bfbac7", kill_on_drop: false }`
[INFO] [stderr] warning: file found to be present in multiple build targets: /opt/rustwide/workdir/examples/auth.rs
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]    Compiling bytes v0.5.5
[INFO] [stderr]    Compiling indexmap v1.4.0
[INFO] [stderr]    Compiling standback v0.2.9
[INFO] [stderr]    Compiling time v0.2.16
[INFO] [stderr]    Compiling mio v0.6.22
[INFO] [stderr]    Compiling unicode-normalization v0.1.9
[INFO] [stderr]    Compiling native-tls v0.2.4
[INFO] [stderr]    Compiling http v0.2.1
[INFO] [stderr]    Compiling idna v0.2.0
[INFO] [stderr]    Compiling tokio v0.2.21
[INFO] [stderr]    Compiling url v2.1.1
[INFO] [stderr]    Compiling http-body v0.3.1
[INFO] [stderr]    Compiling tokio-util v0.3.1
[INFO] [stderr]    Compiling tokio-tls v0.3.1
[INFO] [stderr]    Compiling pin-project-internal v0.4.22
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]    Compiling time-macros-impl v0.1.1
[INFO] [stderr]    Compiling strum_macros v0.18.0
[INFO] [stderr]    Compiling time-macros v0.1.0
[INFO] [stderr]    Compiling pin-project v0.4.22
[INFO] [stderr]    Compiling futures-util v0.3.5
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling h2 v0.2.5
[INFO] [stderr]    Compiling hyper v0.13.6
[INFO] [stderr]    Compiling serde_urlencoded v0.6.1
[INFO] [stderr]    Compiling serde_json v1.0.56
[INFO] [stderr]    Compiling hyper-tls v0.4.3
[INFO] [stderr]    Compiling reqwest v0.10.6
[INFO] [stderr]    Compiling myanimelist-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(external_doc)]
[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 `myanimelist-rs`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "46c1bc468b7eeb9c02cb3a04bb969eb6db6d8419ed5a93ad44ede8f7a6bfbac7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46c1bc468b7eeb9c02cb3a04bb969eb6db6d8419ed5a93ad44ede8f7a6bfbac7", kill_on_drop: false }`
[INFO] [stdout] 46c1bc468b7eeb9c02cb3a04bb969eb6db6d8419ed5a93ad44ede8f7a6bfbac7