[INFO] updating cached repository decentninja/roleplaying-dice
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/decentninja/roleplaying-dice
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/decentninja/roleplaying-dice" "work/ex/beta-1.38-1/sources/1.37.0/gh/decentninja/roleplaying-dice"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/decentninja/roleplaying-dice'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/decentninja/roleplaying-dice" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/decentninja/roleplaying-dice"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/decentninja/roleplaying-dice'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 69d9a031eb75043b67382ad3fcc62b6f822889a9
[INFO] sha for GitHub repo decentninja/roleplaying-dice: 69d9a031eb75043b67382ad3fcc62b6f822889a9
[INFO] validating manifest of decentninja/roleplaying-dice 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 decentninja/roleplaying-dice 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 decentninja/roleplaying-dice
[INFO] finished frobbing decentninja/roleplaying-dice
[INFO] frobbed toml for decentninja/roleplaying-dice written to work/ex/beta-1.38-1/sources/1.37.0/gh/decentninja/roleplaying-dice/Cargo.toml
[INFO] started frobbing decentninja/roleplaying-dice
[INFO] finished frobbing decentninja/roleplaying-dice
[INFO] frobbed toml for decentninja/roleplaying-dice written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/decentninja/roleplaying-dice/Cargo.toml
[INFO] crate decentninja/roleplaying-dice already has a lockfile, it will not be regenerated
[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 decentninja/roleplaying-dice 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-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/decentninja/roleplaying-dice:/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] 0bf2a53b53d4e6c2e41d1465fdea63d4d9395b4f314b37203319b3b735841da9
[INFO] running `"docker" "start" "-a" "0bf2a53b53d4e6c2e41d1465fdea63d4d9395b4f314b37203319b3b735841da9"`
[INFO] [stderr]    Compiling rand v0.4.1
[INFO] [stderr]    Compiling sharp-dice v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(try_trait)]
[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 `sharp-dice`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "0bf2a53b53d4e6c2e41d1465fdea63d4d9395b4f314b37203319b3b735841da9"`
[INFO] running `"docker" "rm" "-f" "0bf2a53b53d4e6c2e41d1465fdea63d4d9395b4f314b37203319b3b735841da9"`
[INFO] [stdout] 0bf2a53b53d4e6c2e41d1465fdea63d4d9395b4f314b37203319b3b735841da9