[INFO] updating cached repository ibaryshnikov/runtime-tcp-chat
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ibaryshnikov/runtime-tcp-chat
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ibaryshnikov/runtime-tcp-chat" "work/ex/beta-1.37-6/sources/1.36.0/gh/ibaryshnikov/runtime-tcp-chat"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/ibaryshnikov/runtime-tcp-chat'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ibaryshnikov/runtime-tcp-chat" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ibaryshnikov/runtime-tcp-chat"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ibaryshnikov/runtime-tcp-chat'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f5ee8116139ee489647b4c524201dc49d8309ccd
[INFO] sha for GitHub repo ibaryshnikov/runtime-tcp-chat: f5ee8116139ee489647b4c524201dc49d8309ccd
[INFO] validating manifest of ibaryshnikov/runtime-tcp-chat on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ibaryshnikov/runtime-tcp-chat on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ibaryshnikov/runtime-tcp-chat
[INFO] finished frobbing ibaryshnikov/runtime-tcp-chat
[INFO] frobbed toml for ibaryshnikov/runtime-tcp-chat written to work/ex/beta-1.37-6/sources/1.36.0/gh/ibaryshnikov/runtime-tcp-chat/Cargo.toml
[INFO] started frobbing ibaryshnikov/runtime-tcp-chat
[INFO] finished frobbing ibaryshnikov/runtime-tcp-chat
[INFO] frobbed toml for ibaryshnikov/runtime-tcp-chat written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ibaryshnikov/runtime-tcp-chat/Cargo.toml
[INFO] crate ibaryshnikov/runtime-tcp-chat already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing ibaryshnikov/runtime-tcp-chat against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ibaryshnikov/runtime-tcp-chat:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] fb4d0a1afd3c236eb13d782862cdfc9ed10e493d511b486fe26091159e2d9866
[INFO] running `"docker" "start" "-a" "fb4d0a1afd3c236eb13d782862cdfc9ed10e493d511b486fe26091159e2d9866"`
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]    Compiling proc-macro-nested v0.1.3
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling async-datagram v2.2.0
[INFO] [stderr]    Compiling async-ready v2.1.0
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling crossbeam-channel v0.3.8
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/async-datagram-2.2.0/src/lib.rs:43:1
[INFO] [stderr]    |
[INFO] [stderr] 43 | #![feature(futures_api)]
[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 `async-datagram`.
[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]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/async-ready-2.1.0/src/lib.rs:42:1
[INFO] [stderr]    |
[INFO] [stderr] 42 | #![feature(futures_api)]
[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 `async-ready`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "fb4d0a1afd3c236eb13d782862cdfc9ed10e493d511b486fe26091159e2d9866"`
[INFO] running `"docker" "rm" "-f" "fb4d0a1afd3c236eb13d782862cdfc9ed10e493d511b486fe26091159e2d9866"`
[INFO] [stdout] fb4d0a1afd3c236eb13d782862cdfc9ed10e493d511b486fe26091159e2d9866