[INFO] crate mohan 0.0.10 is already in cache
[INFO] extracting crate mohan 0.0.10 into work/ex/beta-1.38-1/sources/1.37.0/reg/mohan/0.0.10
[INFO] extracting crate mohan 0.0.10 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mohan/0.0.10
[INFO] validating manifest of mohan-0.0.10 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 mohan-0.0.10 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 mohan-0.0.10
[INFO] finished frobbing mohan-0.0.10
[INFO] frobbed toml for mohan-0.0.10 written to work/ex/beta-1.38-1/sources/1.37.0/reg/mohan/0.0.10/Cargo.toml
[INFO] started frobbing mohan-0.0.10
[INFO] finished frobbing mohan-0.0.10
[INFO] frobbed toml for mohan-0.0.10 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mohan/0.0.10/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 mohan-0.0.10 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-1/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/mohan/0.0.10:/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] 4de99d767e5eb4a5b75835b080a224db7b73a72a139fec62423e740317eb3682
[INFO] running `"docker" "start" "-a" "4de99d767e5eb4a5b75835b080a224db7b73a72a139fec62423e740317eb3682"`
[INFO] [stderr]    Compiling packed_simd v0.3.3
[INFO] [stderr]    Compiling subtle v2.1.1
[INFO] [stderr]    Compiling clear_on_drop v0.2.3
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]    Compiling fixed-hash v0.4.0
[INFO] [stderr]    Compiling blake2b_simd v0.5.7
[INFO] [stderr]    Compiling uint v0.8.1
[INFO] [stderr]    Compiling rand v0.6.5
[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/subtle-2.1.1/src/lib.rs:12:34
[INFO] [stderr]    |
[INFO] [stderr] 12 | #![cfg_attr(feature = "nightly", feature(asm))]
[INFO] [stderr]    |                                  ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling bytes v0.4.12
[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/subtle-2.1.1/src/lib.rs:13:34
[INFO] [stderr]    |
[INFO] [stderr] 13 | #![cfg_attr(feature = "nightly", feature(external_doc))]
[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 `subtle`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4de99d767e5eb4a5b75835b080a224db7b73a72a139fec62423e740317eb3682"`
[INFO] running `"docker" "rm" "-f" "4de99d767e5eb4a5b75835b080a224db7b73a72a139fec62423e740317eb3682"`
[INFO] [stdout] 4de99d767e5eb4a5b75835b080a224db7b73a72a139fec62423e740317eb3682