[INFO] updating cached repository 46bit/seequence
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/46bit/seequence
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/46bit/seequence" "work/ex/beta-1.38-1/sources/1.37.0/gh/46bit/seequence"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/46bit/seequence'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/46bit/seequence" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/46bit/seequence"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/46bit/seequence'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f9177702944337f1156b84fe63a129a4374648dc
[INFO] sha for GitHub repo 46bit/seequence: f9177702944337f1156b84fe63a129a4374648dc
[INFO] validating manifest of 46bit/seequence 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 46bit/seequence 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 46bit/seequence
[INFO] finished frobbing 46bit/seequence
[INFO] frobbed toml for 46bit/seequence written to work/ex/beta-1.38-1/sources/1.37.0/gh/46bit/seequence/Cargo.toml
[INFO] started frobbing 46bit/seequence
[INFO] finished frobbing 46bit/seequence
[INFO] frobbed toml for 46bit/seequence written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/46bit/seequence/Cargo.toml
[INFO] crate 46bit/seequence 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 46bit/seequence 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-7/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/46bit/seequence:/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] c351f4c958ee90be6763f35d44d29088b4a5a29f045d0ec50a33cce2a6b27665
[INFO] running `"docker" "start" "-a" "c351f4c958ee90be6763f35d44d29088b4a5a29f045d0ec50a33cce2a6b27665"`
[INFO] [stderr]    Compiling quote v0.3.12
[INFO] [stderr]    Compiling serde v0.9.7
[INFO] [stderr]    Compiling memchr v0.1.11
[INFO] [stderr]    Compiling net2 v0.2.26
[INFO] [stderr]    Compiling futures v0.1.10
[INFO] [stderr]    Compiling uuid v0.3.1
[INFO] [stderr]    Compiling thread-id v2.0.0
[INFO] [stderr]    Compiling thread_local v0.2.7
[INFO] [stderr]    Compiling aho-corasick v0.5.3
[INFO] [stderr]    Compiling syn v0.11.4
[INFO] [stderr]    Compiling mio v0.6.4
[INFO] [stderr]    Compiling regex v0.1.80
[INFO] [stderr]    Compiling tokio-core v0.1.4
[INFO] [stderr]    Compiling tokio-service v0.1.0
[INFO] [stderr]    Compiling env_logger v0.3.5
[INFO] [stderr]    Compiling serde_codegen_internals v0.13.0
[INFO] [stderr]    Compiling tokio-proto v0.1.0
[INFO] [stderr]    Compiling serde_derive v0.9.7
[INFO] [stderr]    Compiling serde_json v0.9.6
[INFO] [stderr]    Compiling seequence v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(custom_attribute)]
[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 `seequence`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c351f4c958ee90be6763f35d44d29088b4a5a29f045d0ec50a33cce2a6b27665"`
[INFO] running `"docker" "rm" "-f" "c351f4c958ee90be6763f35d44d29088b4a5a29f045d0ec50a33cce2a6b27665"`
[INFO] [stdout] c351f4c958ee90be6763f35d44d29088b4a5a29f045d0ec50a33cce2a6b27665