[INFO] fetching crate rusty-boy-advance 0.0.4...
[INFO] testing rusty-boy-advance-0.0.4 against 1.38.0 for beta-1.39-1
[INFO] extracting crate rusty-boy-advance 0.0.4 into work/builds/worker-5/source
[INFO] validating manifest of crates.io crate rusty-boy-advance 0.0.4 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate rusty-boy-advance 0.0.4
[INFO] finished tweaking crates.io crate rusty-boy-advance 0.0.4
[INFO] tweaked toml for crates.io crate rusty-boy-advance 0.0.4 written to work/builds/worker-5/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-5/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" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 345c5d04eb4c043049c5ce422329f95dc31f094c0022148eb9770556cdd715d4
[INFO] running `"docker" "start" "-a" "345c5d04eb4c043049c5ce422329f95dc31f094c0022148eb9770556cdd715d4"`
[INFO] [stderr]    Compiling rusty-boy-advance v0.0.4 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0432]: unresolved import `alloc::slice::SliceConcatExt`
[INFO] [stderr]  --> src/gba/gba.rs:4:33
[INFO] [stderr]   |
[INFO] [stderr] 4 | use alloc::{boxed::Box, format, slice::SliceConcatExt, string::String, vec::Vec};
[INFO] [stderr]   |                                 ^^^^^^^^^^^^^^^^^^^^^ no `SliceConcatExt` in `slice`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(box_syntax)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(slice_concat_ext)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/gba/gba.rs:7:1
[INFO] [stderr]    |
[INFO] [stderr] 7  | / macro_rules! println_maybe {
[INFO] [stderr] 8  | |   ($($arg:tt)*) => {{
[INFO] [stderr] 9  | |     let x = format!($($arg)*);
[INFO] [stderr] 10 | |     //dbg!(x);
[INFO] [stderr] 11 | |     //println!($($arg)*);
[INFO] [stderr] 12 | |   }};
[INFO] [stderr] 13 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 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 `rusty-boy-advance`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "345c5d04eb4c043049c5ce422329f95dc31f094c0022148eb9770556cdd715d4"`
[INFO] running `"docker" "rm" "-f" "345c5d04eb4c043049c5ce422329f95dc31f094c0022148eb9770556cdd715d4"`
[INFO] [stdout] 345c5d04eb4c043049c5ce422329f95dc31f094c0022148eb9770556cdd715d4