[INFO] updating cached repository MashPlant/ray_tracer
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/MashPlant/ray_tracer
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/MashPlant/ray_tracer" "work/ex/beta-1.38-1/sources/1.37.0/gh/MashPlant/ray_tracer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/MashPlant/ray_tracer'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/MashPlant/ray_tracer" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MashPlant/ray_tracer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MashPlant/ray_tracer'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 842386fb632a02a76195cdd4eeb737beea7ba64d
[INFO] sha for GitHub repo MashPlant/ray_tracer: 842386fb632a02a76195cdd4eeb737beea7ba64d
[INFO] validating manifest of MashPlant/ray_tracer on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of MashPlant/ray_tracer on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing MashPlant/ray_tracer
[INFO] finished frobbing MashPlant/ray_tracer
[INFO] frobbed toml for MashPlant/ray_tracer written to work/ex/beta-1.38-1/sources/1.37.0/gh/MashPlant/ray_tracer/Cargo.toml
[INFO] started frobbing MashPlant/ray_tracer
[INFO] finished frobbing MashPlant/ray_tracer
[INFO] frobbed toml for MashPlant/ray_tracer written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MashPlant/ray_tracer/Cargo.toml
[INFO] crate MashPlant/ray_tracer already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing MashPlant/ray_tracer against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/MashPlant/ray_tracer:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 2683c36a37d6b0c479d770ba1e84ac30f5c1e1bf206c73304f064d51a0d5cc68
[INFO] running `"docker" "start" "-a" "2683c36a37d6b0c479d770ba1e84ac30f5c1e1bf206c73304f064d51a0d5cc68"`
[INFO] [stderr]    Compiling serde v1.0.85
[INFO] [stderr]    Compiling text_io v0.1.7
[INFO] [stderr]    Compiling png v0.11.0
[INFO] [stderr]    Compiling bincode v1.0.1
[INFO] [stderr]    Compiling serde_json v1.0.37
[INFO] [stderr]    Compiling 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(duration_float)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `as_float_secs` found for type `std::time::Duration` in the current scope
[INFO] [stderr]   --> src/world.rs:52:44
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let elapsed = start.elapsed().unwrap().as_float_secs();
[INFO] [stderr]    |                                            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `as_float_secs` found for type `std::time::Duration` in the current scope
[INFO] [stderr]   --> src/world.rs:53:44
[INFO] [stderr]    |
[INFO] [stderr] 53 |     let last_iter = now.elapsed().unwrap().as_float_secs();
[INFO] [stderr]    |                                            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `ray_tracer`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "2683c36a37d6b0c479d770ba1e84ac30f5c1e1bf206c73304f064d51a0d5cc68"`
[INFO] running `"docker" "rm" "-f" "2683c36a37d6b0c479d770ba1e84ac30f5c1e1bf206c73304f064d51a0d5cc68"`
[INFO] [stdout] 2683c36a37d6b0c479d770ba1e84ac30f5c1e1bf206c73304f064d51a0d5cc68