[INFO] updating cached repository 0xbrt/thrash-mask
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/0xbrt/thrash-mask
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/0xbrt/thrash-mask" "work/ex/beta-1.38-1/sources/1.37.0/gh/0xbrt/thrash-mask"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/0xbrt/thrash-mask'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/0xbrt/thrash-mask" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/0xbrt/thrash-mask"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/0xbrt/thrash-mask'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 23c38091d015c507d9f299f5192b979b8eb03338
[INFO] sha for GitHub repo 0xbrt/thrash-mask: 23c38091d015c507d9f299f5192b979b8eb03338
[INFO] validating manifest of 0xbrt/thrash-mask 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 0xbrt/thrash-mask 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 0xbrt/thrash-mask
[INFO] finished frobbing 0xbrt/thrash-mask
[INFO] frobbed toml for 0xbrt/thrash-mask written to work/ex/beta-1.38-1/sources/1.37.0/gh/0xbrt/thrash-mask/Cargo.toml
[INFO] started frobbing 0xbrt/thrash-mask
[INFO] finished frobbing 0xbrt/thrash-mask
[INFO] frobbed toml for 0xbrt/thrash-mask written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/0xbrt/thrash-mask/Cargo.toml
[INFO] crate 0xbrt/thrash-mask 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 0xbrt/thrash-mask 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-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/0xbrt/thrash-mask:/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] 0fcc0b67db0ef407abe190c441b173f249eb11738f6842dfe288052c66122f7f
[INFO] running `"docker" "start" "-a" "0fcc0b67db0ef407abe190c441b173f249eb11738f6842dfe288052c66122f7f"`
[INFO] [stderr]    Compiling rustc-serialize v0.3.21
[INFO] [stderr]    Compiling miniz-sys v0.1.7
[INFO] [stderr]    Compiling num_cpus v1.2.0
[INFO] [stderr]    Compiling deque v0.3.1
[INFO] [stderr]    Compiling gif v0.9.0
[INFO] [stderr]    Compiling num v0.1.36
[INFO] [stderr]    Compiling enum_primitive v0.1.0
[INFO] [stderr]    Compiling rayon v0.5.0
[INFO] [stderr]    Compiling flate2 v0.2.14
[INFO] [stderr]    Compiling png v0.5.2
[INFO] [stderr]    Compiling jpeg-decoder v0.1.8
[INFO] [stderr]    Compiling num-bigint v0.1.35
[INFO] [stderr]    Compiling num-rational v0.1.35
[INFO] [stderr]    Compiling image v0.10.4
[INFO] [stderr]    Compiling thrash-mask 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(step_by)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:40:82
[INFO] [stderr]    |
[INFO] [stderr] 40 | fn generate_layer(input: &DynamicImage, quality: u8) -> Result<DynamicImage, 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/main.rs:46:89
[INFO] [stderr]    |
[INFO] [stderr] 46 | fn generate_layers(input: &DynamicImage, count: usize) -> Result<Vec<DynamicImage>, Box<Error>> {
[INFO] [stderr]    |                                                                                         ^^^^^ help: use `dyn`: `dyn Error`
[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 `thrash-mask`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "0fcc0b67db0ef407abe190c441b173f249eb11738f6842dfe288052c66122f7f"`
[INFO] running `"docker" "rm" "-f" "0fcc0b67db0ef407abe190c441b173f249eb11738f6842dfe288052c66122f7f"`
[INFO] [stdout] 0fcc0b67db0ef407abe190c441b173f249eb11738f6842dfe288052c66122f7f