[INFO] updating cached repository https://github.com/dcastelltort/rusty-chip8
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/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] ba9b44d5f7544aceb4f40a965d49f18413abef9d
[INFO] testing dcastelltort/rusty-chip8 against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdcastelltort%2Frusty-chip8" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dcastelltort/rusty-chip8 on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/dcastelltort/rusty-chip8
[INFO] finished tweaking git repo https://github.com/dcastelltort/rusty-chip8
[INFO] tweaked toml for git repo https://github.com/dcastelltort/rusty-chip8 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/dcastelltort/rusty-chip8 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d1b57fc62f46c98b50640c7dbd84b11bed9b0ba1df03454a69015c3d28c012f0
[INFO] running `"docker" "start" "-a" "d1b57fc62f46c98b50640c7dbd84b11bed9b0ba1df03454a69015c3d28c012f0"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling log v0.4.1
[INFO] [stderr]    Compiling regex-syntax v0.6.0
[INFO] [stderr]    Compiling textwrap v0.9.0
[INFO] [stderr]    Compiling serde_json v1.0.19
[INFO] [stderr]    Compiling serde_derive v1.0.66
[INFO] [stderr]    Compiling structopt-derive v0.2.8
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling clap v2.31.2
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]    Compiling rayon v0.9.0
[INFO] [stderr]    Compiling regex v1.0.0
[INFO] [stderr]    Compiling structopt v0.2.8
[INFO] [stderr]    Compiling env_logger v0.5.10
[INFO] [stderr]    Compiling quicli v0.2.0
[INFO] [stderr]    Compiling rusty-chip8 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(fs_read_write)] //TO REMOVE with ugraded nightly or stable
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #[macro_use] extern crate failure;
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/cpu.rs:199:9
[INFO] [stderr]     |
[INFO] [stderr] 199 |         (self.opcode & (0x0FFF as u16))
[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 `if` condition
[INFO] [stderr]    --> src/cpu.rs:283:11
[INFO] [stderr]     |
[INFO] [stderr] 283 |         if(self.sound_timer > 0)
[INFO] [stderr]     |           ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]    --> src/cpu.rs:127:9
[INFO] [stderr]     |
[INFO] [stderr] 124 |         unimplemented!();
[INFO] [stderr]     |         ----------------- any code following this expression is unreachable
[INFO] [stderr] ...
[INFO] [stderr] 127 |         unimplemented!();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/cpu.rs:298:9
[INFO] [stderr]     |
[INFO] [stderr] 297 |         unimplemented!();
[INFO] [stderr]     |         ----------------- any code following this expression is unreachable
[INFO] [stderr] 298 |         Ok(())
[INFO] [stderr]     |         ^^^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/cpu.rs:318:9
[INFO] [stderr]     |
[INFO] [stderr] 303 | /         loop
[INFO] [stderr] 304 | |         {
[INFO] [stderr] 305 | |             // Emulate one cycle
[INFO] [stderr] 306 | |             self.emulate_cycle();
[INFO] [stderr] ...   |
[INFO] [stderr] 315 | |             self.set_keys()?;    
[INFO] [stderr] 316 | |         } 
[INFO] [stderr]     | |_________- any code following this expression is unreachable
[INFO] [stderr] 317 | 
[INFO] [stderr] 318 |           Ok(())
[INFO] [stderr]     |           ^^^^^^ unreachable expression
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 6 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `rusty-chip8`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d1b57fc62f46c98b50640c7dbd84b11bed9b0ba1df03454a69015c3d28c012f0"`
[INFO] running `"docker" "rm" "-f" "d1b57fc62f46c98b50640c7dbd84b11bed9b0ba1df03454a69015c3d28c012f0"`
[INFO] [stdout] d1b57fc62f46c98b50640c7dbd84b11bed9b0ba1df03454a69015c3d28c012f0