[INFO] updating cached repository Kethku/RustyRayTracer
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Kethku/RustyRayTracer
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Kethku/RustyRayTracer" "work/ex/beta-1.37-6/sources/1.36.0/gh/Kethku/RustyRayTracer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/Kethku/RustyRayTracer'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Kethku/RustyRayTracer" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/Kethku/RustyRayTracer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/Kethku/RustyRayTracer'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 25633642276e2a25325f760faa1f58d1fa1bb375
[INFO] sha for GitHub repo Kethku/RustyRayTracer: 25633642276e2a25325f760faa1f58d1fa1bb375
[INFO] validating manifest of Kethku/RustyRayTracer on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Kethku/RustyRayTracer on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Kethku/RustyRayTracer
[INFO] finished frobbing Kethku/RustyRayTracer
[INFO] frobbed toml for Kethku/RustyRayTracer written to work/ex/beta-1.37-6/sources/1.36.0/gh/Kethku/RustyRayTracer/Cargo.toml
[INFO] started frobbing Kethku/RustyRayTracer
[INFO] finished frobbing Kethku/RustyRayTracer
[INFO] frobbed toml for Kethku/RustyRayTracer written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/Kethku/RustyRayTracer/Cargo.toml
[INFO] crate Kethku/RustyRayTracer already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing Kethku/RustyRayTracer against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/Kethku/RustyRayTracer:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 3b6a80fd5ffe0aa72e1de73205a5d91cd62181dd5f634faaef12410a14bbd05c
[INFO] running `"docker" "start" "-a" "3b6a80fd5ffe0aa72e1de73205a5d91cd62181dd5f634faaef12410a14bbd05c"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr]    Compiling minifb v0.10.4
[INFO] [stderr]    Compiling time v0.1.39
[INFO] [stderr]    Compiling x11-dl v2.14.0
[INFO] [stderr]    Compiling rusty_ray_tracer v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(iterator_step_by)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Barrier`
[INFO] [stderr]  --> src/main.rs:6:29
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::sync::{Arc, Mutex, Barrier};
[INFO] [stderr]   |                             ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::f64::*`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::f64::*;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `characteristics::*`
[INFO] [stderr]  --> src/scene.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use characteristics::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `distance_field::*`
[INFO] [stderr]  --> src/atmosphere.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use distance_field::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `scene::*`
[INFO] [stderr]  --> src/atmosphere.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use scene::*;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `atmosphere::*`
[INFO] [stderr]  --> src/scene_renderer.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use atmosphere::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `rusty_ray_tracer`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3b6a80fd5ffe0aa72e1de73205a5d91cd62181dd5f634faaef12410a14bbd05c"`
[INFO] running `"docker" "rm" "-f" "3b6a80fd5ffe0aa72e1de73205a5d91cd62181dd5f634faaef12410a14bbd05c"`
[INFO] [stdout] 3b6a80fd5ffe0aa72e1de73205a5d91cd62181dd5f634faaef12410a14bbd05c