[INFO] updating cached repository ssalonen/webcam-proxy
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ssalonen/webcam-proxy
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ssalonen/webcam-proxy" "work/ex/beta-1.38-1/sources/1.37.0/gh/ssalonen/webcam-proxy"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ssalonen/webcam-proxy'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ssalonen/webcam-proxy" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ssalonen/webcam-proxy"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ssalonen/webcam-proxy'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] dd95cb9d84316cc61c2cc639916ac1739cbb3671
[INFO] sha for GitHub repo ssalonen/webcam-proxy: dd95cb9d84316cc61c2cc639916ac1739cbb3671
[INFO] validating manifest of ssalonen/webcam-proxy 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 ssalonen/webcam-proxy 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 ssalonen/webcam-proxy
[INFO] finished frobbing ssalonen/webcam-proxy
[INFO] frobbed toml for ssalonen/webcam-proxy written to work/ex/beta-1.38-1/sources/1.37.0/gh/ssalonen/webcam-proxy/Cargo.toml
[INFO] started frobbing ssalonen/webcam-proxy
[INFO] finished frobbing ssalonen/webcam-proxy
[INFO] frobbed toml for ssalonen/webcam-proxy written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ssalonen/webcam-proxy/Cargo.toml
[INFO] crate ssalonen/webcam-proxy 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing ssalonen/webcam-proxy 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-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ssalonen/webcam-proxy:/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] f3b02f2ddf3bfa8e5bec5d6f95e46738062e91706192d20735f5b7276935eb84
[INFO] running `"docker" "start" "-a" "f3b02f2ddf3bfa8e5bec5d6f95e46738062e91706192d20735f5b7276935eb84"`
[INFO] [stderr]    Compiling assert_approx_eq v1.1.0
[INFO] [stderr]    Compiling qutex v0.2.1
[INFO] [stderr]    Compiling approx v0.3.1
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling num-derive v0.2.4
[INFO] [stderr]    Compiling serde_derive v1.0.88
[INFO] [stderr]    Compiling num-rational v0.2.1
[INFO] [stderr]    Compiling png v0.12.0
[INFO] [stderr]    Compiling env_logger v0.5.13
[INFO] [stderr]    Compiling rusttype v0.7.5
[INFO] [stderr]    Compiling tokio-reactor v0.1.8
[INFO] [stderr]    Compiling tokio-threadpool v0.1.11
[INFO] [stderr]    Compiling num v0.2.0
[INFO] [stderr]    Compiling quickcheck v0.6.2
[INFO] [stderr]    Compiling tokio-tcp v0.1.3
[INFO] [stderr]    Compiling tokio-uds v0.2.5
[INFO] [stderr]    Compiling tokio-udp v0.1.3
[INFO] [stderr]    Compiling rayon v1.0.3
[INFO] [stderr]    Compiling tiff v0.2.2
[INFO] [stderr]    Compiling tokio-fs v0.1.5
[INFO] [stderr]    Compiling tokio v0.1.15
[INFO] [stderr]    Compiling jpeg-decoder v0.1.15
[INFO] [stderr]    Compiling hyper v0.12.24
[INFO] [stderr]    Compiling serde v1.0.88
[INFO] [stderr]    Compiling image v0.20.1
[INFO] [stderr]    Compiling hyper-tls v0.3.1
[INFO] [stderr]    Compiling imageproc v0.17.0
[INFO] [stderr]    Compiling toml v0.4.10
[INFO] [stderr]    Compiling webcam-proxy v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(duration_float)]
[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 `webcam-proxy`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f3b02f2ddf3bfa8e5bec5d6f95e46738062e91706192d20735f5b7276935eb84"`
[INFO] running `"docker" "rm" "-f" "f3b02f2ddf3bfa8e5bec5d6f95e46738062e91706192d20735f5b7276935eb84"`
[INFO] [stdout] f3b02f2ddf3bfa8e5bec5d6f95e46738062e91706192d20735f5b7276935eb84