[INFO] updating cached repository rust-gjk/ChatApp
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/rust-gjk/ChatApp
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/rust-gjk/ChatApp" "work/ex/beta-1.38-1/sources/1.37.0/gh/rust-gjk/ChatApp"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/rust-gjk/ChatApp'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/rust-gjk/ChatApp" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rust-gjk/ChatApp"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rust-gjk/ChatApp'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] adaca4248db672f4cb4e205437cc1d2278abc985
[INFO] sha for GitHub repo rust-gjk/ChatApp: adaca4248db672f4cb4e205437cc1d2278abc985
[INFO] validating manifest of rust-gjk/ChatApp 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 rust-gjk/ChatApp 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 rust-gjk/ChatApp
[INFO] finished frobbing rust-gjk/ChatApp
[INFO] frobbed toml for rust-gjk/ChatApp written to work/ex/beta-1.38-1/sources/1.37.0/gh/rust-gjk/ChatApp/Cargo.toml
[INFO] started frobbing rust-gjk/ChatApp
[INFO] finished frobbing rust-gjk/ChatApp
[INFO] frobbed toml for rust-gjk/ChatApp written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rust-gjk/ChatApp/Cargo.toml
[INFO] crate rust-gjk/ChatApp 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 rust-gjk/ChatApp 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-3/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/rust-gjk/ChatApp:/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] 9e1e060932b1424005cf1b64beb007a7f365d2d3ff2056e2ca71a8bdf342d266
[INFO] running `"docker" "start" "-a" "9e1e060932b1424005cf1b64beb007a7f365d2d3ff2056e2ca71a8bdf342d266"`
[INFO] [stderr]    Compiling serde v1.0.44
[INFO] [stderr]    Compiling byteorder v1.2.2
[INFO] [stderr]    Compiling text_io v0.1.7
[INFO] [stderr]    Compiling proc-macro2 v0.3.8
[INFO] [stderr]    Compiling quote v0.5.2
[INFO] [stderr]    Compiling syn v0.13.4
[INFO] [stderr]    Compiling serde_derive_internals v0.23.1
[INFO] [stderr]    Compiling serde_derive v1.0.44
[INFO] [stderr]    Compiling serde_cbor v0.8.2
[INFO] [stderr]    Compiling ChatApp v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: crate `ChatApp` should have a snake case name
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr]   = help: convert the identifier to snake case: `chat_app`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(type_ascription)]
[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 `ChatApp`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9e1e060932b1424005cf1b64beb007a7f365d2d3ff2056e2ca71a8bdf342d266"`
[INFO] running `"docker" "rm" "-f" "9e1e060932b1424005cf1b64beb007a7f365d2d3ff2056e2ca71a8bdf342d266"`
[INFO] [stdout] 9e1e060932b1424005cf1b64beb007a7f365d2d3ff2056e2ca71a8bdf342d266