[INFO] crate image2aa 0.1.3 is already in cache
[INFO] extracting crate image2aa 0.1.3 into work/ex/beta-1.37-6/sources/1.36.0/reg/image2aa/0.1.3
[INFO] extracting crate image2aa 0.1.3 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/image2aa/0.1.3
[INFO] validating manifest of image2aa-0.1.3 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 image2aa-0.1.3 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 image2aa-0.1.3
[INFO] finished frobbing image2aa-0.1.3
[INFO] frobbed toml for image2aa-0.1.3 written to work/ex/beta-1.37-6/sources/1.36.0/reg/image2aa/0.1.3/Cargo.toml
[INFO] started frobbing image2aa-0.1.3
[INFO] finished frobbing image2aa-0.1.3
[INFO] frobbed toml for image2aa-0.1.3 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/image2aa/0.1.3/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing image2aa-0.1.3 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/image2aa/0.1.3:/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 89d8969d98eb531e9f6a8cfe98b5ed16ba0769496a64d93005d642b807647670
[INFO] running `"docker" "start" "-a" "89d8969d98eb531e9f6a8cfe98b5ed16ba0769496a64d93005d642b807647670"`
[INFO] [stderr]    Compiling string-error v0.1.0
[INFO] [stderr]    Compiling ndarray v0.10.14
[INFO] [stderr]    Compiling png v0.11.0
[INFO] [stderr]    Compiling image v0.18.0
[INFO] [stderr]    Compiling image2aa v0.1.3 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #[macro_use] extern crate ndarray;
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/utils.rs:21:74
[INFO] [stderr]    |
[INFO] [stderr] 21 | pub fn read_image<R: Read>(mut image_file: R) -> Result<Array3<f32>, Box<Error>> {
[INFO] [stderr]    |                                                                          ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/utils.rs:33:78
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn read_to_array<D: ImageDecoder>(mut decoder: D) -> Result<Array3<f32>, Box<Error>> {
[INFO] [stderr]    |                                                                              ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/utils.rs:53:44
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn write_grayscale_png(image_file: Box<Write>, img: &Array2<f32>) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                            ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/utils.rs:53:89
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn write_grayscale_png(image_file: Box<Write>, img: &Array2<f32>) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                                         ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]  --> src/cli.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(slice_patterns)]
[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 `image2aa`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "89d8969d98eb531e9f6a8cfe98b5ed16ba0769496a64d93005d642b807647670"`
[INFO] running `"docker" "rm" "-f" "89d8969d98eb531e9f6a8cfe98b5ed16ba0769496a64d93005d642b807647670"`
[INFO] [stdout] 89d8969d98eb531e9f6a8cfe98b5ed16ba0769496a64d93005d642b807647670