[INFO] updating cached repository https://github.com/kotetuco/Rust-BareMetal-GBA-Sample
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3bcbba6bf21787d7519c125f223fa46a3cec80fc
[INFO] testing kotetuco/Rust-BareMetal-GBA-Sample against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkotetuco%2FRust-BareMetal-GBA-Sample" "work/builds/worker-6/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kotetuco/Rust-BareMetal-GBA-Sample on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/kotetuco/Rust-BareMetal-GBA-Sample
[INFO] finished tweaking git repo https://github.com/kotetuco/Rust-BareMetal-GBA-Sample
[INFO] tweaked toml for git repo https://github.com/kotetuco/Rust-BareMetal-GBA-Sample written to work/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/kotetuco/Rust-BareMetal-GBA-Sample already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] eb153e6489cd5ddc3635ccee535bfac740a73f5d548dc11161b3e1588913be61
[INFO] running `"docker" "start" "-a" "eb153e6489cd5ddc3635ccee535bfac740a73f5d548dc11161b3e1588913be61"`
[INFO] [stderr]    Compiling rust-basemetal-gba v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(lang_items)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]   --> src/graphics.rs:92:39
[INFO] [stderr]    |
[INFO] [stderr] 92 |             self.draw_char(character, (x + offset_x), y, color);
[INFO] [stderr]    |                                       ^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]   --> src/lib.rs:30:26
[INFO] [stderr]    |
[INFO] [stderr] 30 |                          (radius + 1),
[INFO] [stderr]    |                          ^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] error[E0522]: definition of an unknown language item: `panic_fmt`
[INFO] [stderr]   --> src/lib.rs:51:1
[INFO] [stderr]    |
[INFO] [stderr] 51 | #[lang = "panic_fmt"]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^ definition of unknown language item `panic_fmt`
[INFO] [stderr] 
[INFO] [stderr] error: `#[panic_handler]` function required, but not found
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0522, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0522`.
[INFO] [stderr] error: could not compile `rust-basemetal-gba`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "eb153e6489cd5ddc3635ccee535bfac740a73f5d548dc11161b3e1588913be61"`
[INFO] running `"docker" "rm" "-f" "eb153e6489cd5ddc3635ccee535bfac740a73f5d548dc11161b3e1588913be61"`
[INFO] [stdout] eb153e6489cd5ddc3635ccee535bfac740a73f5d548dc11161b3e1588913be61