[INFO] updating cached repository nrc/gh-velocity
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/nrc/gh-velocity
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/nrc/gh-velocity" "work/ex/beta-1.38-1/sources/1.37.0/gh/nrc/gh-velocity"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/nrc/gh-velocity'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/nrc/gh-velocity" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nrc/gh-velocity"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nrc/gh-velocity'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2c8208b11fc48f3612ea794e4480c5861689742d
[INFO] sha for GitHub repo nrc/gh-velocity: 2c8208b11fc48f3612ea794e4480c5861689742d
[INFO] validating manifest of nrc/gh-velocity 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 nrc/gh-velocity 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 nrc/gh-velocity
[INFO] finished frobbing nrc/gh-velocity
[INFO] frobbed toml for nrc/gh-velocity written to work/ex/beta-1.38-1/sources/1.37.0/gh/nrc/gh-velocity/Cargo.toml
[INFO] started frobbing nrc/gh-velocity
[INFO] finished frobbing nrc/gh-velocity
[INFO] frobbed toml for nrc/gh-velocity written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nrc/gh-velocity/Cargo.toml
[INFO] crate nrc/gh-velocity 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 nrc/gh-velocity 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/nrc/gh-velocity:/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] 101267e2d687e1b1a8e9faf44afeab205343c4c99381b69dc2b2d27670f3cb31
[INFO] running `"docker" "start" "-a" "101267e2d687e1b1a8e9faf44afeab205343c4c99381b69dc2b2d27670f3cb31"`
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling openssl v0.10.22
[INFO] [stderr]    Compiling pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling fallible-iterator v0.2.0
[INFO] [stderr]    Compiling fallible-streaming-iterator v0.1.9
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling openssl-sys v0.9.46
[INFO] [stderr]    Compiling libsqlite3-sys v0.14.0
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling futures-cpupool v0.1.8
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling http v0.1.17
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]    Compiling tokio-threadpool v0.1.14
[INFO] [stderr]    Compiling mio v0.6.16
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling native-tls v0.2.3
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling backtrace v0.3.15
[INFO] [stderr]    Compiling parking_lot v0.7.1
[INFO] [stderr]    Compiling rusqlite v0.18.0
[INFO] [stderr]    Compiling error-chain v0.12.0
[INFO] [stderr]    Compiling tokio-reactor v0.1.9
[INFO] [stderr]    Compiling tokio-tcp v0.1.3
[INFO] [stderr]    Compiling tokio v0.1.19
[INFO] [stderr]    Compiling h2 v0.1.18
[INFO] [stderr]    Compiling hyperx v0.13.2
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling hyper v0.12.28
[INFO] [stderr]    Compiling hyper-tls v0.3.2
[INFO] [stderr]    Compiling hubcaps v0.5.0
[INFO] [stderr]    Compiling gh-velocity v0.1.0 (/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(async_await)]
[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 `gh-velocity`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "101267e2d687e1b1a8e9faf44afeab205343c4c99381b69dc2b2d27670f3cb31"`
[INFO] running `"docker" "rm" "-f" "101267e2d687e1b1a8e9faf44afeab205343c4c99381b69dc2b2d27670f3cb31"`
[INFO] [stdout] 101267e2d687e1b1a8e9faf44afeab205343c4c99381b69dc2b2d27670f3cb31