[INFO] updating cached repository meain/rustysnake
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/meain/rustysnake
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/meain/rustysnake" "work/ex/beta-1.38-1/sources/1.37.0/gh/meain/rustysnake"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/meain/rustysnake'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/meain/rustysnake" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/meain/rustysnake"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/meain/rustysnake'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fc473125e5b40254cbd5507258a9fe8c78ae89b6
[INFO] sha for GitHub repo meain/rustysnake: fc473125e5b40254cbd5507258a9fe8c78ae89b6
[INFO] validating manifest of meain/rustysnake 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 meain/rustysnake 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 meain/rustysnake
[INFO] finished frobbing meain/rustysnake
[INFO] frobbed toml for meain/rustysnake written to work/ex/beta-1.38-1/sources/1.37.0/gh/meain/rustysnake/Cargo.toml
[INFO] started frobbing meain/rustysnake
[INFO] finished frobbing meain/rustysnake
[INFO] frobbed toml for meain/rustysnake written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/meain/rustysnake/Cargo.toml
[INFO] crate meain/rustysnake 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing meain/rustysnake 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/meain/rustysnake:/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] 4840f9ccc81549abdedba25422458b6a4329fecd0fea931b4aeb43b56aff7d36
[INFO] running `"docker" "start" "-a" "4840f9ccc81549abdedba25422458b6a4329fecd0fea931b4aeb43b56aff7d36"`
[INFO] [stderr]    Compiling wayland-scanner v0.20.12
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling x11-dl v2.18.3
[INFO] [stderr]    Compiling shared_library v0.1.9
[INFO] [stderr]    Compiling glutin v0.18.0
[INFO] [stderr]    Compiling ordered-float v0.5.2
[INFO] [stderr]    Compiling wayland-sys v0.20.12
[INFO] [stderr]    Compiling num-derive v0.2.3
[INFO] [stderr]    Compiling png v0.12.0
[INFO] [stderr]    Compiling pistoncore-input v0.21.0
[INFO] [stderr]    Compiling rusttype v0.4.3
[INFO] [stderr]    Compiling osmesa-sys v0.1.2
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling wayland-commons v0.20.12
[INFO] [stderr]    Compiling wayland-client v0.20.12
[INFO] [stderr]    Compiling wayland-protocols v0.20.12
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling piston2d-graphics v0.26.0
[INFO] [stderr]    Compiling rayon v1.0.2
[INFO] [stderr]    Compiling pistoncore-window v0.32.0
[INFO] [stderr]    Compiling pistoncore-event_loop v0.37.0
[INFO] [stderr]    Compiling tiff v0.2.1
[INFO] [stderr]    Compiling piston v0.37.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.15
[INFO] [stderr]    Compiling smithay-client-toolkit v0.3.0
[INFO] [stderr]    Compiling image v0.20.0
[INFO] [stderr]    Compiling winit v0.17.2
[INFO] [stderr]    Compiling piston2d-opengl_graphics v0.54.0
[INFO] [stderr]    Compiling pistoncore-glutin_window v0.48.0
[INFO] [stderr]    Compiling rustysnake 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(drain_filter)]
[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 `rustysnake`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "4840f9ccc81549abdedba25422458b6a4329fecd0fea931b4aeb43b56aff7d36"`
[INFO] running `"docker" "rm" "-f" "4840f9ccc81549abdedba25422458b6a4329fecd0fea931b4aeb43b56aff7d36"`
[INFO] [stdout] 4840f9ccc81549abdedba25422458b6a4329fecd0fea931b4aeb43b56aff7d36