[INFO] crate bitfield-rle 0.0.0 is already in cache
[INFO] extracting crate bitfield-rle 0.0.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/bitfield-rle/0.0.0
[INFO] extracting crate bitfield-rle 0.0.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/bitfield-rle/0.0.0
[INFO] validating manifest of bitfield-rle-0.0.0 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 bitfield-rle-0.0.0 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 bitfield-rle-0.0.0
[INFO] finished frobbing bitfield-rle-0.0.0
[INFO] frobbed toml for bitfield-rle-0.0.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/bitfield-rle/0.0.0/Cargo.toml
[INFO] started frobbing bitfield-rle-0.0.0
[INFO] finished frobbing bitfield-rle-0.0.0
[INFO] frobbed toml for bitfield-rle-0.0.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/bitfield-rle/0.0.0/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 bitfield-rle-0.0.0 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-4/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/bitfield-rle/0.0.0:/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] 471e779d9a52d9e2b0c41baa1b685c7eef05952d78c5fa3fdc4b8c2a73bdf910
[INFO] running `"docker" "start" "-a" "471e779d9a52d9e2b0c41baa1b685c7eef05952d78c5fa3fdc4b8c2a73bdf910"`
[INFO] [stderr]    Compiling varinteger v1.0.6
[INFO] [stderr]    Compiling bitfield-rle v0.0.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.94s
[INFO] running `"docker" "inspect" "471e779d9a52d9e2b0c41baa1b685c7eef05952d78c5fa3fdc4b8c2a73bdf910"`
[INFO] running `"docker" "rm" "-f" "471e779d9a52d9e2b0c41baa1b685c7eef05952d78c5fa3fdc4b8c2a73bdf910"`
[INFO] [stdout] 471e779d9a52d9e2b0c41baa1b685c7eef05952d78c5fa3fdc4b8c2a73bdf910
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/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/bitfield-rle/0.0.0:/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] 0194a7ea0c88175297c3c3aa53ba8831770c507b7327f65b770d042010fbf92e
[INFO] running `"docker" "start" "-a" "0194a7ea0c88175297c3c3aa53ba8831770c507b7327f65b770d042010fbf92e"`
[INFO] [stderr]    Compiling memory-pager v0.4.6
[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/memory-pager-0.4.6/src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(external_doc)]
[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 `memory-pager`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "0194a7ea0c88175297c3c3aa53ba8831770c507b7327f65b770d042010fbf92e"`
[INFO] running `"docker" "rm" "-f" "0194a7ea0c88175297c3c3aa53ba8831770c507b7327f65b770d042010fbf92e"`
[INFO] [stdout] 0194a7ea0c88175297c3c3aa53ba8831770c507b7327f65b770d042010fbf92e