[INFO] fetching crate amethyst_core 0.10.0...
[INFO] checking amethyst_core-0.10.0 against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] extracting crate amethyst_core 0.10.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate amethyst_core 0.10.0 on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate amethyst_core 0.10.0
[INFO] finished tweaking crates.io crate amethyst_core 0.10.0
[INFO] tweaked toml for crates.io crate amethyst_core 0.10.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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=forbid" "-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" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6223398d653b4bf9c4f3ffdf17f5a2e58e462761abfa29f5236ebd07765a9d65
[INFO] running `"docker" "start" "-a" "6223398d653b4bf9c4f3ffdf17f5a2e58e462761abfa29f5236ebd07765a9d65"`
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]     Checking num-rational v0.2.4
[INFO] [stderr]     Checking nalgebra v0.19.0
[INFO] [stderr]     Checking amethyst_core v0.10.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `ron`
[INFO] [stderr]    --> src/transform/components/transform.rs:768:13
[INFO] [stderr]     |
[INFO] [stderr] 768 |             ron::ser::to_string_pretty(&transform, ron::ser::PrettyConfig::default()).unwrap();
[INFO] [stderr]     |             ^^^ use of undeclared type or module `ron`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `ron`
[INFO] [stderr]    --> src/transform/components/transform.rs:768:52
[INFO] [stderr]     |
[INFO] [stderr] 768 |             ron::ser::to_string_pretty(&transform, ron::ser::PrettyConfig::default()).unwrap();
[INFO] [stderr]     |                                                    ^^^ use of undeclared type or module `ron`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `ron`
[INFO] [stderr]    --> src/transform/components/transform.rs:769:37
[INFO] [stderr]     |
[INFO] [stderr] 769 |         let transform2: Transform = ron::de::from_str(&s).unwrap();
[INFO] [stderr]     |                                     ^^^ use of undeclared type or module `ron`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `ron`
[INFO] [stderr]    --> src/transform/components/transform.rs:776:36
[INFO] [stderr]     |
[INFO] [stderr] 776 |         let transform: Transform = ron::de::from_str("()").unwrap();
[INFO] [stderr]     |                                    ^^^ use of undeclared type or module `ron`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: could not compile `amethyst_core`.
[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 `"docker" "inspect" "6223398d653b4bf9c4f3ffdf17f5a2e58e462761abfa29f5236ebd07765a9d65"`
[INFO] running `"docker" "rm" "-f" "6223398d653b4bf9c4f3ffdf17f5a2e58e462761abfa29f5236ebd07765a9d65"`
[INFO] [stdout] 6223398d653b4bf9c4f3ffdf17f5a2e58e462761abfa29f5236ebd07765a9d65