[INFO] updating cached repository archer884/computus
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/archer884/computus
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/archer884/computus" "work/ex/beta-1.38-1/sources/1.37.0/gh/archer884/computus"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/archer884/computus'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/archer884/computus" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/archer884/computus"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/archer884/computus'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 957c1b671094ebb82e7304b4efa5281af4652ac2
[INFO] sha for GitHub repo archer884/computus: 957c1b671094ebb82e7304b4efa5281af4652ac2
[INFO] validating manifest of archer884/computus 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 archer884/computus 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 archer884/computus
[INFO] finished frobbing archer884/computus
[INFO] frobbed toml for archer884/computus written to work/ex/beta-1.38-1/sources/1.37.0/gh/archer884/computus/Cargo.toml
[INFO] started frobbing archer884/computus
[INFO] finished frobbing archer884/computus
[INFO] frobbed toml for archer884/computus written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/archer884/computus/Cargo.toml
[INFO] crate archer884/computus 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 archer884/computus 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-4/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/archer884/computus:/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] 5eed66026cb64881a5c4376e1698b5bf1c8c7153a5051dbdb95833b0b3fdb7b0
[INFO] running `"docker" "start" "-a" "5eed66026cb64881a5c4376e1698b5bf1c8c7153a5051dbdb95833b0b3fdb7b0"`
[INFO] [stderr]    Compiling computus v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::num::Float`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::num::Float; // needed *only* for `.floor()`
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^ no `Float` in `num`
[INFO] [stderr] 
[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(env)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `computus`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5eed66026cb64881a5c4376e1698b5bf1c8c7153a5051dbdb95833b0b3fdb7b0"`
[INFO] running `"docker" "rm" "-f" "5eed66026cb64881a5c4376e1698b5bf1c8c7153a5051dbdb95833b0b3fdb7b0"`
[INFO] [stdout] 5eed66026cb64881a5c4376e1698b5bf1c8c7153a5051dbdb95833b0b3fdb7b0