[INFO] updating cached repository dgllghr/socks-async
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/dgllghr/socks-async
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/dgllghr/socks-async" "work/ex/beta-1.38-1/sources/1.37.0/gh/dgllghr/socks-async"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/dgllghr/socks-async'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/dgllghr/socks-async" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dgllghr/socks-async"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dgllghr/socks-async'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cfbc5909aab006f570d722242f643bd0d1ce9101
[INFO] sha for GitHub repo dgllghr/socks-async: cfbc5909aab006f570d722242f643bd0d1ce9101
[INFO] validating manifest of dgllghr/socks-async 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 dgllghr/socks-async 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 dgllghr/socks-async
[INFO] finished frobbing dgllghr/socks-async
[INFO] frobbed toml for dgllghr/socks-async written to work/ex/beta-1.38-1/sources/1.37.0/gh/dgllghr/socks-async/Cargo.toml
[INFO] started frobbing dgllghr/socks-async
[INFO] finished frobbing dgllghr/socks-async
[INFO] frobbed toml for dgllghr/socks-async written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dgllghr/socks-async/Cargo.toml
[INFO] crate dgllghr/socks-async 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 dgllghr/socks-async 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/dgllghr/socks-async:/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] 4c447673917672abb0d40cedf1b15fc4e2eaeebd6e89b0e2526325aa9be996b3
[INFO] running `"docker" "start" "-a" "4c447673917672abb0d40cedf1b15fc4e2eaeebd6e89b0e2526325aa9be996b3"`
[INFO] [stderr]    Compiling futures v0.1.25
[INFO] [stderr]    Compiling log v0.4.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.5.2
[INFO] [stderr]    Compiling syn v0.15.13
[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/futures-0.1.25/src/lib.rs:161:34
[INFO] [stderr]     |
[INFO] [stderr] 161 | #![cfg_attr(feature = "nightly", feature(pin))]
[INFO] [stderr]     |                                  ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling mio v0.6.16
[INFO] [stderr]    Compiling crossbeam-deque v0.6.1
[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 `futures`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4c447673917672abb0d40cedf1b15fc4e2eaeebd6e89b0e2526325aa9be996b3"`
[INFO] running `"docker" "rm" "-f" "4c447673917672abb0d40cedf1b15fc4e2eaeebd6e89b0e2526325aa9be996b3"`
[INFO] [stdout] 4c447673917672abb0d40cedf1b15fc4e2eaeebd6e89b0e2526325aa9be996b3