[INFO] updating cached repository yoshuawuyts/github-release
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/yoshuawuyts/github-release
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/yoshuawuyts/github-release" "work/ex/beta-1.38-1/sources/1.37.0/gh/yoshuawuyts/github-release"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/yoshuawuyts/github-release'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/yoshuawuyts/github-release" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/yoshuawuyts/github-release"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/yoshuawuyts/github-release'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6425e9ad3cd7380a1b64c39814144d79a77d151a
[INFO] sha for GitHub repo yoshuawuyts/github-release: 6425e9ad3cd7380a1b64c39814144d79a77d151a
[INFO] validating manifest of yoshuawuyts/github-release 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 yoshuawuyts/github-release 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 yoshuawuyts/github-release
[INFO] finished frobbing yoshuawuyts/github-release
[INFO] frobbed toml for yoshuawuyts/github-release written to work/ex/beta-1.38-1/sources/1.37.0/gh/yoshuawuyts/github-release/Cargo.toml
[INFO] started frobbing yoshuawuyts/github-release
[INFO] finished frobbing yoshuawuyts/github-release
[INFO] frobbed toml for yoshuawuyts/github-release written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/yoshuawuyts/github-release/Cargo.toml
[INFO] crate yoshuawuyts/github-release 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 yoshuawuyts/github-release 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-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/yoshuawuyts/github-release:/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] 5f0ad83fc2551f241b68d49851dc07de7735cbe3bb6ef32f3ce3aa5bce14e89a
[INFO] running `"docker" "start" "-a" "5f0ad83fc2551f241b68d49851dc07de7735cbe3bb6ef32f3ce3aa5bce14e89a"`
[INFO] [stderr]    Compiling libc v0.2.40
[INFO] [stderr]    Compiling byteorder v1.2.2
[INFO] [stderr]    Compiling futures v0.1.21
[INFO] [stderr]    Compiling cc v1.0.9
[INFO] [stderr]    Compiling build_const v0.2.0
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]    Compiling stable_deref_trait v1.0.0
[INFO] [stderr]    Compiling winapi v0.3.4
[INFO] [stderr]    Compiling serde v1.0.37
[INFO] [stderr]    Compiling num-traits v0.2.2
[INFO] [stderr]    Compiling mkdirp v0.1.0
[INFO] [stderr]    Compiling encoding_rs v0.7.2
[INFO] [stderr]    Compiling proc-macro2 v0.3.6
[INFO] [stderr]    Compiling owning_ref v0.3.3
[INFO] [stderr]    Compiling crc v1.7.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling base64 v0.9.0
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling net2 v0.2.32
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling atty v0.2.8
[INFO] [stderr]    Compiling time v0.1.39
[INFO] [stderr]    Compiling clicolors-control v0.2.0
[INFO] [stderr]    Compiling termios v0.2.2
[INFO] [stderr]    Compiling synstructure v0.6.1
[INFO] [stderr]    Compiling syn v0.12.15
[INFO] [stderr]    Compiling bytes v0.4.6
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling mio v0.6.14
[INFO] [stderr]    Compiling quote v0.5.1
[INFO] [stderr]    Compiling clap v2.31.2
[INFO] [stderr]    Compiling aho-corasick v0.6.4
[INFO] [stderr]    Compiling phf_shared v0.7.21
[INFO] [stderr]    Compiling tokio-executor v0.1.2
[INFO] [stderr]    Compiling tokio-service v0.1.0
[INFO] [stderr]    Compiling futures-cpupool v0.1.8
[INFO] [stderr]    Compiling relay v0.1.1
[INFO] [stderr]    Compiling openssl-sys v0.9.28
[INFO] [stderr]    Compiling backtrace-sys v0.1.16
[INFO] [stderr]    Compiling tokio-io v0.1.6
[INFO] [stderr]    Compiling syn v0.13.1
[INFO] [stderr]    Compiling rand v0.3.22
[INFO] [stderr]    Compiling parking_lot_core v0.2.13
[INFO] [stderr]    Compiling directories v0.8.5
[INFO] [stderr]    Compiling failure_derive v0.1.1
[INFO] [stderr]    Compiling phf v0.7.21
[INFO] [stderr]    Compiling regex v0.2.10
[INFO] [stderr]    Compiling libflate v0.1.14
[INFO] [stderr]    Compiling tokio-threadpool v0.1.2
[INFO] [stderr]    Compiling tokio-timer v0.2.1
[INFO] [stderr]    Compiling phf_generator v0.7.21
[INFO] [stderr]    Compiling tempfile v2.2.0
[INFO] [stderr]    Compiling uuid v0.5.1
[INFO] [stderr]    Compiling tokio-reactor v0.1.1
[INFO] [stderr]    Compiling parking_lot v0.5.4
[INFO] [stderr]    Compiling rayon v0.9.0
[INFO] [stderr]    Compiling serde_urlencoded v0.5.1
[INFO] [stderr]    Compiling serde_json v1.0.13
[INFO] [stderr]    Compiling phf_codegen v0.7.21
[INFO] [stderr]    Compiling structopt-derive v0.2.6
[INFO] [stderr]    Compiling openssl v0.9.24
[INFO] [stderr]    Compiling tokio-tcp v0.1.0
[INFO] [stderr]    Compiling tokio-udp v0.1.0
[INFO] [stderr]    Compiling mime_guess v2.0.0-alpha.4
[INFO] [stderr]    Compiling tokio v0.1.5
[INFO] [stderr]    Compiling serde_derive_internals v0.23.0
[INFO] [stderr]    Compiling tokio-core v0.1.17
[INFO] [stderr]    Compiling backtrace v0.3.5
[INFO] [stderr]    Compiling serde_derive v1.0.37
[INFO] [stderr]    Compiling failure v0.1.1
[INFO] [stderr]    Compiling console v0.6.1
[INFO] [stderr]    Compiling env_logger v0.5.6
[INFO] [stderr]    Compiling tokio-proto v0.1.1
[INFO] [stderr]    Compiling dialoguer v0.1.0
[INFO] [stderr]    Compiling structopt v0.2.6
[INFO] [stderr]    Compiling native-tls v0.1.5
[INFO] [stderr]    Compiling tokio-tls v0.1.4
[INFO] [stderr]    Compiling hyper v0.11.25
[INFO] [stderr]    Compiling quicli v0.2.0
[INFO] [stderr]    Compiling hyper-tls v0.1.3
[INFO] [stderr]    Compiling reqwest v0.8.5
[INFO] [stderr]    Compiling github-release v0.1.3-alpha.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(external_doc)]
[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 `github-release`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5f0ad83fc2551f241b68d49851dc07de7735cbe3bb6ef32f3ce3aa5bce14e89a"`
[INFO] running `"docker" "rm" "-f" "5f0ad83fc2551f241b68d49851dc07de7735cbe3bb6ef32f3ce3aa5bce14e89a"`
[INFO] [stdout] 5f0ad83fc2551f241b68d49851dc07de7735cbe3bb6ef32f3ce3aa5bce14e89a