[INFO] crate rust-freqdist 0.1.5 is already in cache
[INFO] extracting crate rust-freqdist 0.1.5 into work/ex/beta-1.37-6/sources/1.36.0/reg/rust-freqdist/0.1.5
[INFO] extracting crate rust-freqdist 0.1.5 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rust-freqdist/0.1.5
[INFO] validating manifest of rust-freqdist-0.1.5 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 rust-freqdist-0.1.5 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 rust-freqdist-0.1.5
[INFO] finished frobbing rust-freqdist-0.1.5
[INFO] frobbed toml for rust-freqdist-0.1.5 written to work/ex/beta-1.37-6/sources/1.36.0/reg/rust-freqdist/0.1.5/Cargo.toml
[INFO] started frobbing rust-freqdist-0.1.5
[INFO] finished frobbing rust-freqdist-0.1.5
[INFO] frobbed toml for rust-freqdist-0.1.5 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rust-freqdist/0.1.5/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 rust-freqdist-0.1.5 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-0/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/rust-freqdist/0.1.5:/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] f2166508c7b080b616fcaab0f8bf5796777d72fd52b05f99209593b426454c04
[INFO] running `"docker" "start" "-a" "f2166508c7b080b616fcaab0f8bf5796777d72fd52b05f99209593b426454c04"`
[INFO] [stderr]    Compiling rust-freqdist v0.1.5 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.36s
[INFO] running `"docker" "inspect" "f2166508c7b080b616fcaab0f8bf5796777d72fd52b05f99209593b426454c04"`
[INFO] running `"docker" "rm" "-f" "f2166508c7b080b616fcaab0f8bf5796777d72fd52b05f99209593b426454c04"`
[INFO] [stdout] f2166508c7b080b616fcaab0f8bf5796777d72fd52b05f99209593b426454c04
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/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/rust-freqdist/0.1.5:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] cd5f7c698f076cb7cb67beccafc9cf1fc7a05e69865927b33a35aa69f21e82ea
[INFO] running `"docker" "start" "-a" "cd5f7c698f076cb7cb67beccafc9cf1fc7a05e69865927b33a35aa69f21e82ea"`
[INFO] [stderr]    Compiling rust-freqdist v0.1.5 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:29:19
[INFO] [stderr]    |
[INFO] [stderr] 29 | #![cfg_attr(test, feature(test))]
[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 `rust-freqdist`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "cd5f7c698f076cb7cb67beccafc9cf1fc7a05e69865927b33a35aa69f21e82ea"`
[INFO] running `"docker" "rm" "-f" "cd5f7c698f076cb7cb67beccafc9cf1fc7a05e69865927b33a35aa69f21e82ea"`
[INFO] [stdout] cd5f7c698f076cb7cb67beccafc9cf1fc7a05e69865927b33a35aa69f21e82ea