[INFO] crate holochain_persistence_mem 0.0.6 is already in cache
[INFO] extracting crate holochain_persistence_mem 0.0.6 into work/ex/beta-1.38-1/sources/1.37.0/reg/holochain_persistence_mem/0.0.6
[INFO] extracting crate holochain_persistence_mem 0.0.6 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/holochain_persistence_mem/0.0.6
[INFO] validating manifest of holochain_persistence_mem-0.0.6 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 holochain_persistence_mem-0.0.6 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 holochain_persistence_mem-0.0.6
[INFO] finished frobbing holochain_persistence_mem-0.0.6
[INFO] frobbed toml for holochain_persistence_mem-0.0.6 written to work/ex/beta-1.38-1/sources/1.37.0/reg/holochain_persistence_mem/0.0.6/Cargo.toml
[INFO] started frobbing holochain_persistence_mem-0.0.6
[INFO] finished frobbing holochain_persistence_mem-0.0.6
[INFO] frobbed toml for holochain_persistence_mem-0.0.6 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/holochain_persistence_mem/0.0.6/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 holochain_persistence_mem-0.0.6 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-6/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/holochain_persistence_mem/0.0.6:/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] f85c51648ccc20833269c63fc89871a7dc5dc66aef5fdf985d4ab98192ef4add
[INFO] running `"docker" "start" "-a" "f85c51648ccc20833269c63fc89871a7dc5dc66aef5fdf985d4ab98192ef4add"`
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling syn v0.15.31
[INFO] [stderr]    Compiling regex v1.1.2
[INFO] [stderr]    Compiling reed-solomon v0.2.1
[INFO] [stderr]    Compiling holochain_json_api v0.0.15
[INFO] [stderr]    Compiling holochain_persistence_api v0.0.6
[INFO] [stderr]    Compiling objekt v0.1.2
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling hcid v0.0.6
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]    Compiling syn v0.12.15
[INFO] [stderr]    Compiling serde_test v1.0.89
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling uuid v0.7.1
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling rust-base58 v0.0.4
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling shrinkwraprs v0.2.1
[INFO] [stderr]    Compiling serde_derive v1.0.89
[INFO] [stderr]    Compiling holochain_json_derive v0.0.15
[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/holochain_json_api-0.0.15/src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(try_trait)]
[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/holochain_json_api-0.0.15/src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(never_type)]
[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 `holochain_json_api`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f85c51648ccc20833269c63fc89871a7dc5dc66aef5fdf985d4ab98192ef4add"`
[INFO] running `"docker" "rm" "-f" "f85c51648ccc20833269c63fc89871a7dc5dc66aef5fdf985d4ab98192ef4add"`
[INFO] [stdout] f85c51648ccc20833269c63fc89871a7dc5dc66aef5fdf985d4ab98192ef4add