[INFO] updating cached repository ef4/photobomb
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ef4/photobomb
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ef4/photobomb" "work/ex/beta-1.38-1/sources/1.37.0/gh/ef4/photobomb"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ef4/photobomb'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ef4/photobomb" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ef4/photobomb"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ef4/photobomb'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e3a8faf8a5f35acb8070e8e9779cc85592260bc0
[INFO] sha for GitHub repo ef4/photobomb: e3a8faf8a5f35acb8070e8e9779cc85592260bc0
[INFO] validating manifest of ef4/photobomb 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 ef4/photobomb 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 ef4/photobomb
[INFO] finished frobbing ef4/photobomb
[INFO] frobbed toml for ef4/photobomb written to work/ex/beta-1.38-1/sources/1.37.0/gh/ef4/photobomb/Cargo.toml
[INFO] started frobbing ef4/photobomb
[INFO] finished frobbing ef4/photobomb
[INFO] frobbed toml for ef4/photobomb written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ef4/photobomb/Cargo.toml
[INFO] crate ef4/photobomb 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 ef4/photobomb 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ef4/photobomb:/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] 6223397e52534407bb83129ef057e67b0796e7e7e2e514e91115ec2eaf94ab4d
[INFO] running `"docker" "start" "-a" "6223397e52534407bb83129ef057e67b0796e7e7e2e514e91115ec2eaf94ab4d"`
[INFO] [stderr]    Compiling dtoa v0.4.1
[INFO] [stderr]    Compiling itoa v0.3.1
[INFO] [stderr]    Compiling num-traits v0.1.37
[INFO] [stderr]    Compiling lazy_static v0.2.8
[INFO] [stderr]    Compiling unicode-segmentation v1.1.0
[INFO] [stderr]    Compiling vec_map v0.7.0
[INFO] [stderr]    Compiling cfg-if v0.1.0
[INFO] [stderr]    Compiling state v0.2.1
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/state-0.2.1/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(const_fn)]
[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 `state`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "6223397e52534407bb83129ef057e67b0796e7e7e2e514e91115ec2eaf94ab4d"`
[INFO] running `"docker" "rm" "-f" "6223397e52534407bb83129ef057e67b0796e7e7e2e514e91115ec2eaf94ab4d"`
[INFO] [stdout] 6223397e52534407bb83129ef057e67b0796e7e7e2e514e91115ec2eaf94ab4d