[INFO] updating cached repository sgrif/cotli-helper
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sgrif/cotli-helper
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sgrif/cotli-helper" "work/ex/beta-1.38-1/sources/1.37.0/gh/sgrif/cotli-helper"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/sgrif/cotli-helper'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sgrif/cotli-helper" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sgrif/cotli-helper"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sgrif/cotli-helper'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 510f8f14d73390921a4e22a24eab9fb0a64554ad
[INFO] sha for GitHub repo sgrif/cotli-helper: 510f8f14d73390921a4e22a24eab9fb0a64554ad
[INFO] validating manifest of sgrif/cotli-helper 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 sgrif/cotli-helper 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 sgrif/cotli-helper
[INFO] removed 0 missing tests
[INFO] finished frobbing sgrif/cotli-helper
[INFO] frobbed toml for sgrif/cotli-helper written to work/ex/beta-1.38-1/sources/1.37.0/gh/sgrif/cotli-helper/Cargo.toml
[INFO] started frobbing sgrif/cotli-helper
[INFO] removed 0 missing tests
[INFO] finished frobbing sgrif/cotli-helper
[INFO] frobbed toml for sgrif/cotli-helper written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sgrif/cotli-helper/Cargo.toml
[INFO] crate sgrif/cotli-helper 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 sgrif/cotli-helper 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/sgrif/cotli-helper:/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] 53248ccda308fdcedf5caf213f8a7b64547a614a875ed2db99b601b0188c263c
[INFO] running `"docker" "start" "-a" "53248ccda308fdcedf5caf213f8a7b64547a614a875ed2db99b601b0188c263c"`
[INFO] [stderr] warning: An explicit [[test]] section is specified in Cargo.toml which currently
[INFO] [stderr] disables Cargo from automatically inferring other test targets.
[INFO] [stderr] This inference behavior will change in the Rust 2018 edition and the following
[INFO] [stderr] files will be included as a test target:
[INFO] [stderr] 
[INFO] [stderr] * /opt/crater/workdir/tests/support.rs
[INFO] [stderr] 
[INFO] [stderr] This is likely to break cargo build or cargo test as these files may not be
[INFO] [stderr] ready to be compiled as a test target today. You can future-proof yourself
[INFO] [stderr] and disable this warning by adding `autotests = false` to your [package]
[INFO] [stderr] section. You may also move the files to a location where Cargo would not
[INFO] [stderr] automatically infer them to be a target, such as in subfolders.
[INFO] [stderr] 
[INFO] [stderr] For more information on this warning you can consult
[INFO] [stderr] https://github.com/rust-lang/cargo/issues/5330
[INFO] [stderr]    Compiling toml v0.4.1
[INFO] [stderr]    Compiling itertools v0.6.0
[INFO] [stderr]    Compiling cotli-helper v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(conservative_impl_trait)]
[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 `cotli-helper`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "53248ccda308fdcedf5caf213f8a7b64547a614a875ed2db99b601b0188c263c"`
[INFO] running `"docker" "rm" "-f" "53248ccda308fdcedf5caf213f8a7b64547a614a875ed2db99b601b0188c263c"`
[INFO] [stdout] 53248ccda308fdcedf5caf213f8a7b64547a614a875ed2db99b601b0188c263c