[INFO] updating cached repository https://github.com/saraersson/OS_sem2
[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] 35d75493f660cb43e3e4f25c701547f80b491f86
[INFO] testing saraersson/OS_sem2 against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsaraersson%2FOS_sem2" "/workspace/builds/worker-13/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/saraersson/OS_sem2 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/saraersson/OS_sem2
[INFO] finished tweaking git repo https://github.com/saraersson/OS_sem2
[INFO] tweaked toml for git repo https://github.com/saraersson/OS_sem2 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/saraersson/OS_sem2 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] b6ce191196b7f942d8fa6bb1067007a790feaead4aac5291c4dd13d4c5914cc1
[INFO] running `"docker" "start" "-a" "b6ce191196b7f942d8fa6bb1067007a790feaead4aac5291c4dd13d4c5914cc1"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling rlibc v1.0.0
[INFO] [stderr]    Compiling volatile v0.1.0
[INFO] [stderr]    Compiling blog_os 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:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(const_fn)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(lang_items)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(unique)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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(const_unique_new)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `core::fmt`
[INFO] [stderr]   --> src/vga_buffer.rs:62:5
[INFO] [stderr]    |
[INFO] [stderr] 62 | use core::fmt;
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0522]: definition of an unknown language item: `panic_fmt`
[INFO] [stderr]   --> src/lib.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | #[lang = "panic_fmt"] #[no_mangle] 
[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[E0658]: use of unstable library feature 'ptr_internals': use `NonNull` instead and consider `PhantomData<T>` (if you also use `#[may_dangle]`), `Send`, and/or `Sync`
[INFO] [stderr]   --> src/vga_buffer.rs:38:28
[INFO] [stderr]    |
[INFO] [stderr] 38 |           buffer: unsafe { Unique::new_unchecked(0xb8000 as *mut _) },
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'ptr_internals': use `NonNull` instead and consider `PhantomData<T>` (if you also use `#[may_dangle]`), `Send`, and/or `Sync`
[INFO] [stderr]   --> src/vga_buffer.rs:61:5
[INFO] [stderr]    |
[INFO] [stderr] 61 | use core::ptr::Unique;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'ptr_internals': use `NonNull` instead and consider `PhantomData<T>` (if you also use `#[may_dangle]`), `Send`, and/or `Sync`
[INFO] [stderr]   --> src/vga_buffer.rs:67:13
[INFO] [stderr]    |
[INFO] [stderr] 67 |     buffer: Unique<Buffer>,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'ptr_internals'
[INFO] [stderr]   --> src/vga_buffer.rs:38:28
[INFO] [stderr]    |
[INFO] [stderr] 38 |           buffer: unsafe { Unique::new_unchecked(0xb8000 as *mut _) },
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'ptr_internals'
[INFO] [stderr]    --> src/vga_buffer.rs:109:30
[INFO] [stderr]     |
[INFO] [stderr] 109 |         unsafe { self.buffer.as_mut() }
[INFO] [stderr]     |                              ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 11 previous errors; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0522, E0554, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0522`.
[INFO] [stderr] error: could not compile `blog_os`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b6ce191196b7f942d8fa6bb1067007a790feaead4aac5291c4dd13d4c5914cc1"`
[INFO] running `"docker" "rm" "-f" "b6ce191196b7f942d8fa6bb1067007a790feaead4aac5291c4dd13d4c5914cc1"`
[INFO] [stdout] b6ce191196b7f942d8fa6bb1067007a790feaead4aac5291c4dd13d4c5914cc1