[INFO] cloning repository Sporious/Toy-Rust-OS
[INFO] running `"git" "clone" "--bare" "git://github.com/Sporious/Toy-Rust-OS.git" "work/cache/sources/gh/Sporious/Toy-Rust-OS"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/Sporious/Toy-Rust-OS'...
[INFO] running `"git" "clone" "work/cache/sources/gh/Sporious/Toy-Rust-OS" "work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/Sporious/Toy-Rust-OS"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/Sporious/Toy-Rust-OS'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Sporious/Toy-Rust-OS" "work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/Sporious/Toy-Rust-OS"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/Sporious/Toy-Rust-OS'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7f1ed894f7f5810e7e14b34d04bc263dea06b621
[INFO] sha for GitHub repo Sporious/Toy-Rust-OS: 7f1ed894f7f5810e7e14b34d04bc263dea06b621
[INFO] validating manifest of Sporious/Toy-Rust-OS on toolchain master#c8865d8e195813ade6b84434ac9f8850e7112d1a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Sporious/Toy-Rust-OS on toolchain try#e212b7d492c96d3837691ba29d32d5f468933fb8
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Sporious/Toy-Rust-OS
[INFO] finished frobbing Sporious/Toy-Rust-OS
[INFO] frobbed toml for Sporious/Toy-Rust-OS written to work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/Sporious/Toy-Rust-OS/Cargo.toml
[INFO] started frobbing Sporious/Toy-Rust-OS
[INFO] finished frobbing Sporious/Toy-Rust-OS
[INFO] frobbed toml for Sporious/Toy-Rust-OS written to work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/Sporious/Toy-Rust-OS/Cargo.toml
[INFO] crate Sporious/Toy-Rust-OS already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] testing Sporious/Toy-Rust-OS against try#e212b7d492c96d3837691ba29d32d5f468933fb8 for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-0/try#e212b7d492c96d3837691ba29d32d5f468933fb8:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/Sporious/Toy-Rust-OS:/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=forbid" "-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" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "build" "--frozen"`
[INFO] [stdout] 59311a0a40ed3072ce5cd284627fd3f6cb2089ff5c5cb73843e4bf6882f86d71
[INFO] running `"docker" "start" "-a" "59311a0a40ed3072ce5cd284627fd3f6cb2089ff5c5cb73843e4bf6882f86d71"`
[INFO] [stderr] warning: `panic` setting is ignored for `test` profile
[INFO] [stderr]    Compiling rpi_os v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]    Compiling rlibc v1.0.0
[INFO] [stderr]    Compiling volatile v0.2.4
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/stdio.rs:84:37
[INFO] [stderr]    |
[INFO] [stderr] 84 |         stdioback.guard_out = true; ///Lock the mutex 
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 85 |         Stdio { stdioback }
[INFO] [stderr]    |         ------------------- rustdoc does not generate documentation for expressions
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_doc_comments)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Iterator`
[INFO] [stderr]  --> src/stdio.rs:4:32
[INFO] [stderr]   |
[INFO] [stderr] 4 | use core::iter::{IntoIterator, Iterator};
[INFO] [stderr]   |                                ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `ReadOnly`, `WriteOnly`
[INFO] [stderr]  --> src/uart.rs:5:16
[INFO] [stderr]   |
[INFO] [stderr] 5 | use volatile::{ReadOnly, ReadWrite, Volatile, WriteOnly};
[INFO] [stderr]   |                ^^^^^^^^                       ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `core::sync::atomic::AtomicBool`
[INFO] [stderr]   --> src/lib.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 | use core::sync::atomic::AtomicBool;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0522]: definition of an unknown language item: `panic_fmt`
[INFO] [stderr]   --> src/lib.rs:50:1
[INFO] [stderr]    |
[INFO] [stderr] 50 | #[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 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0522`.
[INFO] [stderr] error: Could not compile `rpi_os`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "59311a0a40ed3072ce5cd284627fd3f6cb2089ff5c5cb73843e4bf6882f86d71"`
[INFO] running `"docker" "rm" "-f" "59311a0a40ed3072ce5cd284627fd3f6cb2089ff5c5cb73843e4bf6882f86d71"`
[INFO] [stdout] 59311a0a40ed3072ce5cd284627fd3f6cb2089ff5c5cb73843e4bf6882f86d71