[INFO] crate generic_cong_avoid 0.2.1 is already in cache
[INFO] extracting crate generic_cong_avoid 0.2.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/generic_cong_avoid/0.2.1
[INFO] extracting crate generic_cong_avoid 0.2.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/generic_cong_avoid/0.2.1
[INFO] validating manifest of generic_cong_avoid-0.2.1 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 generic_cong_avoid-0.2.1 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 generic_cong_avoid-0.2.1
[INFO] finished frobbing generic_cong_avoid-0.2.1
[INFO] frobbed toml for generic_cong_avoid-0.2.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/generic_cong_avoid/0.2.1/Cargo.toml
[INFO] started frobbing generic_cong_avoid-0.2.1
[INFO] finished frobbing generic_cong_avoid-0.2.1
[INFO] frobbed toml for generic_cong_avoid-0.2.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/generic_cong_avoid/0.2.1/Cargo.toml
[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 generic_cong_avoid-0.2.1 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/generic_cong_avoid/0.2.1:/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 90e660e379889857c878b33b44bbfc183c237fc94f533c890d391ec274c36b79
[INFO] running `"docker" "start" "-a" "90e660e379889857c878b33b44bbfc183c237fc94f533c890d391ec274c36b79"`
[INFO] [stderr]    Compiling winapi v0.3.7
[INFO] [stderr]    Compiling slog-term v2.4.1
[INFO] [stderr]    Compiling winconsole v0.10.0
[INFO] [stderr]    Compiling colored v1.8.0
[INFO] [stderr]    Compiling portus v0.5.1
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/portus-0.5.1/src/lib.rs:69:1
[INFO] [stderr]    |
[INFO] [stderr] 69 | #![feature(box_patterns)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/portus-0.5.1/src/lib.rs:70:1
[INFO] [stderr]    |
[INFO] [stderr] 70 | #![feature(integer_atomics)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/portus-0.5.1/src/lib.rs:71:1
[INFO] [stderr]    |
[INFO] [stderr] 71 | #![feature(never_type)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/portus-0.5.1/src/lib.rs:72:1
[INFO] [stderr]    |
[INFO] [stderr] 72 | #![feature(stmt_expr_attributes)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/portus-0.5.1/src/lib.rs:73:1
[INFO] [stderr]    |
[INFO] [stderr] 73 | #![feature(test)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `portus`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "90e660e379889857c878b33b44bbfc183c237fc94f533c890d391ec274c36b79"`
[INFO] running `"docker" "rm" "-f" "90e660e379889857c878b33b44bbfc183c237fc94f533c890d391ec274c36b79"`
[INFO] [stdout] 90e660e379889857c878b33b44bbfc183c237fc94f533c890d391ec274c36b79