[INFO] updating cached repository xeals/stratagem
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/xeals/stratagem
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/xeals/stratagem" "work/ex/beta-1.38-1/sources/1.37.0/gh/xeals/stratagem"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/xeals/stratagem'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/xeals/stratagem" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/xeals/stratagem"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/xeals/stratagem'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 28d899c67d3d717aa0b8bb2cb3eec8cdb8872eaf
[INFO] sha for GitHub repo xeals/stratagem: 28d899c67d3d717aa0b8bb2cb3eec8cdb8872eaf
[INFO] validating manifest of xeals/stratagem 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 xeals/stratagem 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 xeals/stratagem
[INFO] finished frobbing xeals/stratagem
[INFO] frobbed toml for xeals/stratagem written to work/ex/beta-1.38-1/sources/1.37.0/gh/xeals/stratagem/Cargo.toml
[INFO] started frobbing xeals/stratagem
[INFO] finished frobbing xeals/stratagem
[INFO] frobbed toml for xeals/stratagem written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/xeals/stratagem/Cargo.toml
[INFO] crate xeals/stratagem 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 xeals/stratagem 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/gh/xeals/stratagem:/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] 48d4d18d74596a96538b31f9e5be4e7eb93ad85db20042e01a96d43ff154712f
[INFO] running `"docker" "start" "-a" "48d4d18d74596a96538b31f9e5be4e7eb93ad85db20042e01a96d43ff154712f"`
[INFO] [stderr]    Compiling cc v1.0.3
[INFO] [stderr]    Compiling libc v0.2.35
[INFO] [stderr]    Compiling rustc-demangle v0.1.5
[INFO] [stderr]    Compiling termion v1.5.1
[INFO] [stderr]    Compiling rand v0.4.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.16
[INFO] [stderr]    Compiling backtrace v0.3.5
[INFO] [stderr]    Compiling failure v0.1.1
[INFO] [stderr]    Compiling stratagem 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(vec_remove_item)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Write`
[INFO] [stderr]   --> src/main.rs:11:21
[INFO] [stderr]    |
[INFO] [stderr] 11 | use std::io::{self, Write};
[INFO] [stderr]    |                     ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[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 `stratagem`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "48d4d18d74596a96538b31f9e5be4e7eb93ad85db20042e01a96d43ff154712f"`
[INFO] running `"docker" "rm" "-f" "48d4d18d74596a96538b31f9e5be4e7eb93ad85db20042e01a96d43ff154712f"`
[INFO] [stdout] 48d4d18d74596a96538b31f9e5be4e7eb93ad85db20042e01a96d43ff154712f