[INFO] updating cached repository main--/shotgun
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/main--/shotgun
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/main--/shotgun" "work/ex/beta-1.38-1/sources/1.37.0/gh/main--/shotgun"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/main--/shotgun'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/main--/shotgun" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/main--/shotgun"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/main--/shotgun'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 51ad3c86df5232fa7a5f933a6ff403f3ac081573
[INFO] sha for GitHub repo main--/shotgun: 51ad3c86df5232fa7a5f933a6ff403f3ac081573
[INFO] validating manifest of main--/shotgun 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 main--/shotgun 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 main--/shotgun
[INFO] removed path dependency screenshot from main--/shotgun
[INFO] finished frobbing main--/shotgun
[INFO] frobbed toml for main--/shotgun written to work/ex/beta-1.38-1/sources/1.37.0/gh/main--/shotgun/Cargo.toml
[INFO] started frobbing main--/shotgun
[INFO] removed path dependency screenshot from main--/shotgun
[INFO] finished frobbing main--/shotgun
[INFO] frobbed toml for main--/shotgun written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/main--/shotgun/Cargo.toml
[INFO] crate main--/shotgun 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] [stderr]     Updating crates.io index
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/main--/shotgun/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Updating git repository `https://github.com/main--/vulkano.git`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Updating git repository `https://github.com/main--/vulkano.git`
[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 main--/shotgun 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-2/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/main--/shotgun:/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] 602b9a89fd60923ba9c48758fbe3f0b575b7e07da3a0f7e6bca729af7b089efe
[INFO] running `"docker" "start" "-a" "602b9a89fd60923ba9c48758fbe3f0b575b7e07da3a0f7e6bca729af7b089efe"`
[INFO] [stderr] warning: dependency (screenshot) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
[INFO] [stderr]    Compiling vulkano v0.7.2 (https://github.com/main--/vulkano.git?branch=patch-1#04946b57)
[INFO] [stderr]    Compiling vk-sys v0.3.2 (https://github.com/main--/vulkano.git?branch=patch-1#04946b57)
[INFO] [stderr]    Compiling smallvec v0.5.1
[INFO] [stderr]    Compiling glsl-to-spirv v0.1.3 (https://github.com/main--/vulkano.git?branch=patch-1#04946b57)
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling memmap v0.6.2
[INFO] [stderr]    Compiling screenshot v0.0.7
[INFO] [stderr]    Compiling cgmath v0.15.0
[INFO] [stderr] error[E0432]: unresolved import `ffi`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/screenshot-0.0.7/src/lib.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 | pub use ffi::{get_screenshot};
[INFO] [stderr]    |         ^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         unresolved import
[INFO] [stderr]    |         help: a similar path exists: `std::ffi`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/screenshot-0.0.7/src/lib.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | #![feature(core_intrinsics, convert)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `screenshot`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "602b9a89fd60923ba9c48758fbe3f0b575b7e07da3a0f7e6bca729af7b089efe"`
[INFO] running `"docker" "rm" "-f" "602b9a89fd60923ba9c48758fbe3f0b575b7e07da3a0f7e6bca729af7b089efe"`
[INFO] [stdout] 602b9a89fd60923ba9c48758fbe3f0b575b7e07da3a0f7e6bca729af7b089efe