[INFO] updating cached repository dropbox/ruba
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/dropbox/ruba
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/dropbox/ruba" "work/ex/pr-57483/sources/master#2bde39b8edce6463e1c37f8a8082a875e7b536b1/gh/dropbox/ruba"`
[INFO] [stderr] Cloning into 'work/ex/pr-57483/sources/master#2bde39b8edce6463e1c37f8a8082a875e7b536b1/gh/dropbox/ruba'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/dropbox/ruba" "work/ex/pr-57483/sources/try#0d8b5d1f16bab9e975695518ff8705bdab9fe94c/gh/dropbox/ruba"`
[INFO] [stderr] Cloning into 'work/ex/pr-57483/sources/try#0d8b5d1f16bab9e975695518ff8705bdab9fe94c/gh/dropbox/ruba'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 60f3e8674f59669f827c2ea59f61c71768cb3b9d
[INFO] sha for GitHub repo dropbox/ruba: 60f3e8674f59669f827c2ea59f61c71768cb3b9d
[INFO] validating manifest of dropbox/ruba on toolchain master#2bde39b8edce6463e1c37f8a8082a875e7b536b1
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+2bde39b8edce6463e1c37f8a8082a875e7b536b1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of dropbox/ruba on toolchain try#0d8b5d1f16bab9e975695518ff8705bdab9fe94c
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0d8b5d1f16bab9e975695518ff8705bdab9fe94c-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing dropbox/ruba
[INFO] finished frobbing dropbox/ruba
[INFO] frobbed toml for dropbox/ruba written to work/ex/pr-57483/sources/master#2bde39b8edce6463e1c37f8a8082a875e7b536b1/gh/dropbox/ruba/Cargo.toml
[INFO] started frobbing dropbox/ruba
[INFO] finished frobbing dropbox/ruba
[INFO] frobbed toml for dropbox/ruba written to work/ex/pr-57483/sources/try#0d8b5d1f16bab9e975695518ff8705bdab9fe94c/gh/dropbox/ruba/Cargo.toml
[INFO] crate dropbox/ruba has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+2bde39b8edce6463e1c37f8a8082a875e7b536b1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0d8b5d1f16bab9e975695518ff8705bdab9fe94c-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking dropbox/ruba against master#2bde39b8edce6463e1c37f8a8082a875e7b536b1 for pr-57483
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57483/worker-5/master#2bde39b8edce6463e1c37f8a8082a875e7b536b1:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57483/sources/master#2bde39b8edce6463e1c37f8a8082a875e7b536b1/gh/dropbox/ruba:/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=forbid" "-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" "+2bde39b8edce6463e1c37f8a8082a875e7b536b1-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 2b46aa09b5c044d223204ebf13d9f160a4dfd58dae9dc830c8c13c37eadeaf36
[INFO] running `"docker" "start" "-a" "2b46aa09b5c044d223204ebf13d9f160a4dfd58dae9dc830c8c13c37eadeaf36"`
[INFO] [stderr]     Checking either v1.4.0
[INFO] [stderr]    Compiling heapsize v0.3.9
[INFO] [stderr]     Checking memchr v1.0.2
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking nix v0.5.1
[INFO] [stderr]     Checking bincode v0.9.2
[INFO] [stderr]     Checking num-bigint v0.1.43
[INFO] [stderr]     Checking env_logger v0.5.6
[INFO] [stderr]     Checking nom v3.2.1
[INFO] [stderr]     Checking csv v0.15.0
[INFO] [stderr]     Checking futures-core v0.2.0-alpha
[INFO] [stderr]     Checking itertools v0.5.10
[INFO] [stderr]     Checking futures-channel v0.2.0-alpha
[INFO] [stderr]     Checking futures-io v0.2.0-alpha
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking futures-sink v0.2.0-alpha
[INFO] [stderr]     Checking futures-util v0.2.0-alpha
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking chrono v0.4.0
[INFO] [stderr]     Checking rustyline v1.0.0
[INFO] [stderr]     Checking futures-executor v0.2.0-alpha
[INFO] [stderr]     Checking futures v0.2.0-alpha
[INFO] [stderr]     Checking ruba 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(fn_traits, integer_atomics, refcell_replace_swap, trait_alias, 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 `ruba`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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(fn_traits, integer_atomics, refcell_replace_swap, trait_alias, 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 `ruba`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "2b46aa09b5c044d223204ebf13d9f160a4dfd58dae9dc830c8c13c37eadeaf36"`
[INFO] running `"docker" "rm" "-f" "2b46aa09b5c044d223204ebf13d9f160a4dfd58dae9dc830c8c13c37eadeaf36"`
[INFO] [stdout] 2b46aa09b5c044d223204ebf13d9f160a4dfd58dae9dc830c8c13c37eadeaf36