[INFO] crate wu-diff 0.1.1 is already in cache
[INFO] extracting crate wu-diff 0.1.1 into work/ex/beta-1.37-6/sources/1.36.0/reg/wu-diff/0.1.1
[INFO] extracting crate wu-diff 0.1.1 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/wu-diff/0.1.1
[INFO] validating manifest of wu-diff-0.1.1 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 wu-diff-0.1.1 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 wu-diff-0.1.1
[INFO] finished frobbing wu-diff-0.1.1
[INFO] frobbed toml for wu-diff-0.1.1 written to work/ex/beta-1.37-6/sources/1.36.0/reg/wu-diff/0.1.1/Cargo.toml
[INFO] started frobbing wu-diff-0.1.1
[INFO] finished frobbing wu-diff-0.1.1
[INFO] frobbed toml for wu-diff-0.1.1 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/wu-diff/0.1.1/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 wu-diff-0.1.1 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-2/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/wu-diff/0.1.1:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 233b896267fe018a7b1bb9d77b57f4cb515c4988e5f0bdcffeeed894faa17cae
[INFO] running `"docker" "start" "-a" "233b896267fe018a7b1bb9d77b57f4cb515c4988e5f0bdcffeeed894faa17cae"`
[INFO] [stderr]    Compiling wu-diff v0.1.1 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.59s
[INFO] running `"docker" "inspect" "233b896267fe018a7b1bb9d77b57f4cb515c4988e5f0bdcffeeed894faa17cae"`
[INFO] running `"docker" "rm" "-f" "233b896267fe018a7b1bb9d77b57f4cb515c4988e5f0bdcffeeed894faa17cae"`
[INFO] [stdout] 233b896267fe018a7b1bb9d77b57f4cb515c4988e5f0bdcffeeed894faa17cae
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/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/wu-diff/0.1.1:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 08f7f76e4777edadd0cdc7574649602003d3dd22d429e20f971a73c8d0e6cf81
[INFO] running `"docker" "start" "-a" "08f7f76e4777edadd0cdc7574649602003d3dd22d429e20f971a73c8d0e6cf81"`
[INFO] [stderr]    Compiling rand_xoshiro v0.1.0
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling png v0.11.0
[INFO] [stderr]    Compiling criterion v0.2.11
[INFO] [stderr]    Compiling image v0.18.0
[INFO] [stderr]    Compiling wu-diff v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]  --> tests/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(extern_prelude)]
[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 `wu-diff`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "08f7f76e4777edadd0cdc7574649602003d3dd22d429e20f971a73c8d0e6cf81"`
[INFO] running `"docker" "rm" "-f" "08f7f76e4777edadd0cdc7574649602003d3dd22d429e20f971a73c8d0e6cf81"`
[INFO] [stdout] 08f7f76e4777edadd0cdc7574649602003d3dd22d429e20f971a73c8d0e6cf81