[INFO] updating cached repository Geal/bittorrent
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Geal/bittorrent
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Geal/bittorrent" "work/ex/beta-1.38-1/sources/1.37.0/gh/Geal/bittorrent"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Geal/bittorrent'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Geal/bittorrent" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Geal/bittorrent"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Geal/bittorrent'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 58bb68c986abe081dbc12f7a7d6be3bd1cb9aef6
[INFO] sha for GitHub repo Geal/bittorrent: 58bb68c986abe081dbc12f7a7d6be3bd1cb9aef6
[INFO] validating manifest of Geal/bittorrent 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 Geal/bittorrent 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 Geal/bittorrent
[INFO] finished frobbing Geal/bittorrent
[INFO] frobbed toml for Geal/bittorrent written to work/ex/beta-1.38-1/sources/1.37.0/gh/Geal/bittorrent/Cargo.toml
[INFO] started frobbing Geal/bittorrent
[INFO] finished frobbing Geal/bittorrent
[INFO] frobbed toml for Geal/bittorrent written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Geal/bittorrent/Cargo.toml
[INFO] crate Geal/bittorrent 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]     Updating crates.io index
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Geal/bittorrent/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 Geal/bittorrent 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/Geal/bittorrent:/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] c251f8e10b4c23f72973cfb099291f1430c0c0178ff59ddff82b01e9e36bfe9f
[INFO] running `"docker" "start" "-a" "c251f8e10b4c23f72973cfb099291f1430c0c0178ff59ddff82b01e9e36bfe9f"`
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling nom v1.0.1
[INFO] [stderr]    Compiling sha1 v0.1.1
[INFO] [stderr]    Compiling bittorrent 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(test,vec_push_all,drain)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `push_all` found for type `std::vec::Vec<_>` in the current scope
[INFO] [stderr]   --> src/main.rs:61:19
[INFO] [stderr]    |
[INFO] [stderr] 61 |                 v.push_all(&rest[1..n+1]);
[INFO] [stderr]    |                   ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `bittorrent`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c251f8e10b4c23f72973cfb099291f1430c0c0178ff59ddff82b01e9e36bfe9f"`
[INFO] running `"docker" "rm" "-f" "c251f8e10b4c23f72973cfb099291f1430c0c0178ff59ddff82b01e9e36bfe9f"`
[INFO] [stdout] c251f8e10b4c23f72973cfb099291f1430c0c0178ff59ddff82b01e9e36bfe9f