[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-1.38-1/sources/1.37.0/gh/ibaryshnikov/runtime-tcp-chat"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ibaryshnikov/runtime-tcp-chat'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ibaryshnikov/runtime-tcp-chat" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ibaryshnikov/runtime-tcp-chat"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ibaryshnikov/runtime-tcp-chat 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 ibaryshnikov/runtime-tcp-chat
[INFO] finished frobbing ibaryshnikov/runtime-tcp-chat
[INFO] frobbed toml for ibaryshnikov/runtime-tcp-chat written to work/ex/beta-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "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 ibaryshnikov/runtime-tcp-chat 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/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 591e1877d6d2386f1d4c7a4942dd842e1f02d452f814ed8e54fc8d96f500338a
[INFO] running `"docker" "start" "-a" "591e1877d6d2386f1d4c7a4942dd842e1f02d452f814ed8e54fc8d96f500338a"`
[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 pin-utils v0.1.0-alpha.4
[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 mio v0.6.17
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable 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]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable 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: 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: 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" "591e1877d6d2386f1d4c7a4942dd842e1f02d452f814ed8e54fc8d96f500338a"`
[INFO] running `"docker" "rm" "-f" "591e1877d6d2386f1d4c7a4942dd842e1f02d452f814ed8e54fc8d96f500338a"`
[INFO] [stdout] 591e1877d6d2386f1d4c7a4942dd842e1f02d452f814ed8e54fc8d96f500338a