[INFO] updating cached repository CoherentThought/fonsflorum
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/CoherentThought/fonsflorum
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/CoherentThought/fonsflorum" "work/ex/beta-1.38-1/sources/1.37.0/gh/CoherentThought/fonsflorum"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/CoherentThought/fonsflorum'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/CoherentThought/fonsflorum" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/CoherentThought/fonsflorum"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/CoherentThought/fonsflorum'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 489472573f1afab94b469e933e3acc6597e02137
[INFO] sha for GitHub repo CoherentThought/fonsflorum: 489472573f1afab94b469e933e3acc6597e02137
[INFO] validating manifest of CoherentThought/fonsflorum 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 CoherentThought/fonsflorum 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 CoherentThought/fonsflorum
[INFO] finished frobbing CoherentThought/fonsflorum
[INFO] frobbed toml for CoherentThought/fonsflorum written to work/ex/beta-1.38-1/sources/1.37.0/gh/CoherentThought/fonsflorum/Cargo.toml
[INFO] started frobbing CoherentThought/fonsflorum
[INFO] finished frobbing CoherentThought/fonsflorum
[INFO] frobbed toml for CoherentThought/fonsflorum written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/CoherentThought/fonsflorum/Cargo.toml
[INFO] crate CoherentThought/fonsflorum 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 CoherentThought/fonsflorum against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/CoherentThought/fonsflorum:/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] eee8dac37c45eaf3ce69fcd1e71403c6eba9f1e6786fe93c434295456e8ab28d
[INFO] running `"docker" "start" "-a" "eee8dac37c45eaf3ce69fcd1e71403c6eba9f1e6786fe93c434295456e8ab28d"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.28
[INFO] [stderr]    Compiling syn v0.15.32
[INFO] [stderr]    Compiling dlib v0.4.1
[INFO] [stderr]    Compiling rusttype v0.7.6
[INFO] [stderr]    Compiling rayon v1.0.3
[INFO] [stderr]    Compiling wayland-sys v0.21.12
[INFO] [stderr]    Compiling wayland-commons v0.21.12
[INFO] [stderr]    Compiling andrew v0.2.1
[INFO] [stderr]    Compiling piston2d-graphics v0.30.0
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]    Compiling wayland-scanner v0.21.12
[INFO] [stderr]    Compiling jpeg-decoder v0.1.15
[INFO] [stderr]    Compiling wayland-client v0.21.12
[INFO] [stderr]    Compiling wayland-protocols v0.21.12
[INFO] [stderr]    Compiling serde_derive v1.0.90
[INFO] [stderr]    Compiling num-derive v0.2.4
[INFO] [stderr]    Compiling derivative v1.0.2
[INFO] [stderr]    Compiling smithay-client-toolkit v0.4.5
[INFO] [stderr]    Compiling tiff v0.2.2
[INFO] [stderr]    Compiling winit v0.18.1
[INFO] [stderr]    Compiling image v0.21.1
[INFO] [stderr]    Compiling gfx_core v0.8.3
[INFO] [stderr]    Compiling gfx_core v0.9.0
[INFO] [stderr]    Compiling glutin v0.19.0
[INFO] [stderr]    Compiling pistoncore-input v0.24.0
[INFO] [stderr]    Compiling pistoncore-window v0.37.0
[INFO] [stderr]    Compiling pistoncore-event_loop v0.42.0
[INFO] [stderr]    Compiling pistoncore-glutin_window v0.54.0
[INFO] [stderr]    Compiling piston v0.42.0
[INFO] [stderr]    Compiling gfx v0.17.1
[INFO] [stderr]    Compiling gfx_device_gl v0.15.5
[INFO] [stderr]    Compiling piston-gfx_texture v0.35.0
[INFO] [stderr]    Compiling piston2d-gfx_graphics v0.56.0
[INFO] [stderr]    Compiling piston_window v0.89.0
[INFO] [stderr]    Compiling vereflorum v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(nll)]
[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 `vereflorum`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "eee8dac37c45eaf3ce69fcd1e71403c6eba9f1e6786fe93c434295456e8ab28d"`
[INFO] running `"docker" "rm" "-f" "eee8dac37c45eaf3ce69fcd1e71403c6eba9f1e6786fe93c434295456e8ab28d"`
[INFO] [stdout] eee8dac37c45eaf3ce69fcd1e71403c6eba9f1e6786fe93c434295456e8ab28d