[INFO] crate parse_torrent 0.5.2 is already in cache
[INFO] extracting crate parse_torrent 0.5.2 into work/ex/beta-1.37-6/sources/1.36.0/reg/parse_torrent/0.5.2
[INFO] extracting crate parse_torrent 0.5.2 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/parse_torrent/0.5.2
[INFO] validating manifest of parse_torrent-0.5.2 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of parse_torrent-0.5.2 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing parse_torrent-0.5.2
[INFO] finished frobbing parse_torrent-0.5.2
[INFO] frobbed toml for parse_torrent-0.5.2 written to work/ex/beta-1.37-6/sources/1.36.0/reg/parse_torrent/0.5.2/Cargo.toml
[INFO] started frobbing parse_torrent-0.5.2
[INFO] finished frobbing parse_torrent-0.5.2
[INFO] frobbed toml for parse_torrent-0.5.2 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/parse_torrent/0.5.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing parse_torrent-0.5.2 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/parse_torrent/0.5.2:/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] aeb5a380204bd90b4dd888201d771df5dd142c55e3fd1948ee42d4146f144175
[INFO] running `"docker" "start" "-a" "aeb5a380204bd90b4dd888201d771df5dd142c55e3fd1948ee42d4146f144175"`
[INFO] [stderr]    Compiling serde v1.0.98
[INFO] [stderr]    Compiling syn v0.10.8
[INFO] [stderr]    Compiling bincode v0.6.1
[INFO] [stderr]    Compiling bencode v0.1.16
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.3
[INFO] [stderr]    Compiling serde_codegen v0.8.23
[INFO] [stderr]    Compiling serde_derive v0.8.23
[INFO] [stderr]    Compiling serde_bencode v0.1.3
[INFO] [stderr]    Compiling serde_bytes v0.10.5
[INFO] [stderr]    Compiling parse_torrent v0.5.2 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(proc_macro)] // Rust nightly
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `parse_torrent`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "aeb5a380204bd90b4dd888201d771df5dd142c55e3fd1948ee42d4146f144175"`
[INFO] running `"docker" "rm" "-f" "aeb5a380204bd90b4dd888201d771df5dd142c55e3fd1948ee42d4146f144175"`
[INFO] [stdout] aeb5a380204bd90b4dd888201d771df5dd142c55e3fd1948ee42d4146f144175