[INFO] updating cached repository juanibiapina/king
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/juanibiapina/king
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/juanibiapina/king" "work/ex/beta-1.38-1/sources/1.37.0/gh/juanibiapina/king"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/juanibiapina/king'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/juanibiapina/king" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/juanibiapina/king"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/juanibiapina/king'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1c5a00fcd5ea423eba6579a8a7d7146f9b7e0d55
[INFO] sha for GitHub repo juanibiapina/king: 1c5a00fcd5ea423eba6579a8a7d7146f9b7e0d55
[INFO] validating manifest of juanibiapina/king 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 juanibiapina/king 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 juanibiapina/king
[INFO] finished frobbing juanibiapina/king
[INFO] frobbed toml for juanibiapina/king written to work/ex/beta-1.38-1/sources/1.37.0/gh/juanibiapina/king/Cargo.toml
[INFO] started frobbing juanibiapina/king
[INFO] finished frobbing juanibiapina/king
[INFO] frobbed toml for juanibiapina/king written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/juanibiapina/king/Cargo.toml
[INFO] crate juanibiapina/king 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 juanibiapina/king 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/juanibiapina/king:/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] 2f653bf56ed33e942e82dca07c8eff3548270583f327bb7fc6e9eb6b3bf46ddf
[INFO] running `"docker" "start" "-a" "2f653bf56ed33e942e82dca07c8eff3548270583f327bb7fc6e9eb6b3bf46ddf"`
[INFO] [stderr]    Compiling ncurses v5.87.0
[INFO] [stderr]    Compiling king v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(splice)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]   --> src/buffer.rs:45:30
[INFO] [stderr]    |
[INFO] [stderr] 45 |         self.contents.insert((y + 1), rest);
[INFO] [stderr]    |                              ^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `splice` found for type `std::string::String` in the current scope
[INFO] [stderr]   --> src/buffer.rs:79:34
[INFO] [stderr]    |
[INFO] [stderr] 79 |                 self.contents[y].splice(offset..(offset+grapheme.len()), "");
[INFO] [stderr]    |                                  ^^^^^^ help: there is a method with a similar name: `split`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `king`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "2f653bf56ed33e942e82dca07c8eff3548270583f327bb7fc6e9eb6b3bf46ddf"`
[INFO] running `"docker" "rm" "-f" "2f653bf56ed33e942e82dca07c8eff3548270583f327bb7fc6e9eb6b3bf46ddf"`
[INFO] [stdout] 2f653bf56ed33e942e82dca07c8eff3548270583f327bb7fc6e9eb6b3bf46ddf