[INFO] updating cached repository entropic-dev/dstopic
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/entropic-dev/dstopic
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/entropic-dev/dstopic" "work/ex/beta-1.38-1/sources/1.37.0/gh/entropic-dev/dstopic"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/entropic-dev/dstopic'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/entropic-dev/dstopic" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/entropic-dev/dstopic"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/entropic-dev/dstopic'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 71d2558e380fc53dd148e326679ba32301c85dba
[INFO] sha for GitHub repo entropic-dev/dstopic: 71d2558e380fc53dd148e326679ba32301c85dba
[INFO] validating manifest of entropic-dev/dstopic 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 entropic-dev/dstopic 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 entropic-dev/dstopic
[INFO] removed workspace from entropic-dev/dstopic
[INFO] finished frobbing entropic-dev/dstopic
[INFO] frobbed toml for entropic-dev/dstopic written to work/ex/beta-1.38-1/sources/1.37.0/gh/entropic-dev/dstopic/Cargo.toml
[INFO] started frobbing entropic-dev/dstopic
[INFO] removed workspace from entropic-dev/dstopic
[INFO] finished frobbing entropic-dev/dstopic
[INFO] frobbed toml for entropic-dev/dstopic written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/entropic-dev/dstopic/Cargo.toml
[INFO] crate entropic-dev/dstopic 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 entropic-dev/dstopic 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/entropic-dev/dstopic:/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] c8cf31560d3a19eb9de362b04c83a7090937e1622681588015db871b80b1fcd7
[INFO] running `"docker" "start" "-a" "c8cf31560d3a19eb9de362b04c83a7090937e1622681588015db871b80b1fcd7"`
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]    Compiling futures v0.1.28
[INFO] [stderr]    Compiling byte-tools v0.3.1
[INFO] [stderr]    Compiling serde v1.0.94
[INFO] [stderr]    Compiling openssl v0.10.23
[INFO] [stderr]    Compiling regex v1.1.9
[INFO] [stderr]    Compiling utf8-ranges v1.0.3
[INFO] [stderr]    Compiling native-tls v0.2.3
[INFO] [stderr]    Compiling opaque-debug v0.2.2
[INFO] [stderr]    Compiling fake-simd v0.1.2
[INFO] [stderr]    Compiling hex v0.3.2
[INFO] [stderr]    Compiling remove_dir_all v0.5.2
[INFO] [stderr]    Compiling mkdirp v1.0.0
[INFO] [stderr]    Compiling error-chain v0.12.1
[INFO] [stderr]    Compiling try_from v0.3.2
[INFO] [stderr]    Compiling backtrace-sys v0.1.30
[INFO] [stderr]    Compiling miniz_oxide_c_api v0.2.2
[INFO] [stderr]    Compiling openssl-sys v0.9.47
[INFO] [stderr]    Compiling regex-syntax v0.6.8
[INFO] [stderr]    Compiling miniz_oxide v0.2.2
[INFO] [stderr]    Compiling block-padding v0.1.4
[INFO] [stderr]    Compiling walkdir v2.2.8
[INFO] [stderr]    Compiling crossbeam-utils v0.6.5
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]    Compiling encoding_rs v0.8.17
[INFO] [stderr]    Compiling hyper v0.12.31
[INFO] [stderr]    Compiling num_cpus v1.10.1
[INFO] [stderr]    Compiling getrandom v0.1.6
[INFO] [stderr]    Compiling base64 v0.10.1
[INFO] [stderr]    Compiling aho-corasick v0.7.4
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling mio v0.6.19
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.1
[INFO] [stderr]    Compiling crossbeam-queue v0.1.2
[INFO] [stderr]    Compiling rand_core v0.5.0
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]    Compiling cookie v0.12.0
[INFO] [stderr]    Compiling tokio-sync v0.1.6
[INFO] [stderr]    Compiling tokio-executor v0.1.8
[INFO] [stderr]    Compiling want v0.2.0
[INFO] [stderr]    Compiling futures-cpupool v0.1.8
[INFO] [stderr]    Compiling flate2 v1.0.9
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling tokio-buf v0.1.1
[INFO] [stderr]    Compiling string v0.2.1
[INFO] [stderr]    Compiling http v0.1.17
[INFO] [stderr]    Compiling crossbeam-deque v0.7.1
[INFO] [stderr]    Compiling rand_chacha v0.2.0
[INFO] [stderr]    Compiling sha2 v0.8.0
[INFO] [stderr]    Compiling sha-1 v0.8.1
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling uuid v0.7.4
[INFO] [stderr]    Compiling backtrace v0.3.32
[INFO] [stderr]    Compiling tokio-current-thread v0.1.6
[INFO] [stderr]    Compiling tokio-timer v0.2.11
[INFO] [stderr]    Compiling tokio-threadpool v0.1.15
[INFO] [stderr]    Compiling rand v0.7.0
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]    Compiling parking_lot v0.7.1
[INFO] [stderr]    Compiling mime_guess v2.0.0-alpha.6
[INFO] [stderr]    Compiling tokio-reactor v0.1.9
[INFO] [stderr]    Compiling tempfile v3.1.0
[INFO] [stderr]    Compiling h2 v0.1.25
[INFO] [stderr]    Compiling http-body v0.1.0
[INFO] [stderr]    Compiling tokio-tcp v0.1.3
[INFO] [stderr]    Compiling tokio v0.1.22
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling serde_derive v1.0.94
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling publicsuffix v1.5.2
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling chownr v2.0.0
[INFO] [stderr]    Compiling hyper-tls v0.3.2
[INFO] [stderr]    Compiling serde_json v1.0.40
[INFO] [stderr]    Compiling ssri v3.0.0
[INFO] [stderr]    Compiling serde_urlencoded v0.5.5
[INFO] [stderr]    Compiling cookie_store v0.7.0
[INFO] [stderr]    Compiling cacache v1.0.1
[INFO] [stderr]    Compiling reqwest v0.9.18
[INFO] [stderr]    Compiling dstopic 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:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(async_await)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `cacache`
[INFO] [stderr]  --> src/fetch.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use cacache;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `reqwest`
[INFO] [stderr]  --> src/fetch.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use reqwest;
[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 `dstopic`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c8cf31560d3a19eb9de362b04c83a7090937e1622681588015db871b80b1fcd7"`
[INFO] running `"docker" "rm" "-f" "c8cf31560d3a19eb9de362b04c83a7090937e1622681588015db871b80b1fcd7"`
[INFO] [stdout] c8cf31560d3a19eb9de362b04c83a7090937e1622681588015db871b80b1fcd7