[INFO] crate yagii 0.1.3 is already in cache
[INFO] testing yagii-0.1.3 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate yagii 0.1.3 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate yagii 0.1.3 on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate yagii 0.1.3
[INFO] finished tweaking crates.io crate yagii 0.1.3
[INFO] tweaked toml for crates.io crate yagii 0.1.3 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stdout] 320e9a46a0d8f9f70e1602fb8639f0db2d2203d3b4850c0238eabc642da7db97
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "320e9a46a0d8f9f70e1602fb8639f0db2d2203d3b4850c0238eabc642da7db97"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
[INFO] [stderr]    Compiling keccak v0.1.0
[INFO] [stderr]    Compiling approx v0.1.1
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling png v0.12.0
[INFO] [stderr]    Compiling palette v0.4.1
[INFO] [stderr]    Compiling sha3 v0.7.3
[INFO] [stderr]    Compiling image v0.19.0
[INFO] [stderr]    Compiling palette_derive v0.4.1
[INFO] [stderr]    Compiling yagii v0.1.3 (/opt/rustwide/workdir)
[INFO] [stderr] warning[E0705]: the feature `rust_2018_preview` is included in the Rust 2018 edition
[INFO] [stderr]   --> src/lib.rs:21:12
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![feature(rust_2018_preview, const_fn)]
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:21:1
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![feature(rust_2018_preview, const_fn)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `log`
[INFO] [stderr]   --> src/lib.rs:29:18
[INFO] [stderr]    |
[INFO] [stderr] 29 | use log::{debug, log};
[INFO] [stderr]    |                  ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0705.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `yagii`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "320e9a46a0d8f9f70e1602fb8639f0db2d2203d3b4850c0238eabc642da7db97"`
[INFO] running `"docker" "rm" "-f" "320e9a46a0d8f9f70e1602fb8639f0db2d2203d3b4850c0238eabc642da7db97"`
[INFO] [stdout] 320e9a46a0d8f9f70e1602fb8639f0db2d2203d3b4850c0238eabc642da7db97