[INFO] updating cached repository breezykermo/os.phil-opp
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/breezykermo/os.phil-opp
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/breezykermo/os.phil-opp" "work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/breezykermo/os.phil-opp"`
[INFO] [stderr] Cloning into 'work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/breezykermo/os.phil-opp'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/breezykermo/os.phil-opp" "work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/breezykermo/os.phil-opp"`
[INFO] [stderr] Cloning into 'work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/breezykermo/os.phil-opp'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d9d521e119098f3f6cf8bf154ef40f17b9ac37c2
[INFO] sha for GitHub repo breezykermo/os.phil-opp: d9d521e119098f3f6cf8bf154ef40f17b9ac37c2
[INFO] validating manifest of breezykermo/os.phil-opp on toolchain master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of breezykermo/os.phil-opp on toolchain try#58b21121d0b447ceb3f1a655155d802191acf044
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing breezykermo/os.phil-opp
[INFO] finished frobbing breezykermo/os.phil-opp
[INFO] frobbed toml for breezykermo/os.phil-opp written to work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/breezykermo/os.phil-opp/Cargo.toml
[INFO] started frobbing breezykermo/os.phil-opp
[INFO] finished frobbing breezykermo/os.phil-opp
[INFO] frobbed toml for breezykermo/os.phil-opp written to work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/breezykermo/os.phil-opp/Cargo.toml
[INFO] crate breezykermo/os.phil-opp already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+58b21121d0b447ceb3f1a655155d802191acf044-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking breezykermo/os.phil-opp against master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504 for pr-61100
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-61100/worker-0/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/breezykermo/os.phil-opp:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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" "+8869ee03d7f258e1b76a11c6fbb01b5708a9f504-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 02e5f5c84a443d02a9193ffb2bc34064a0037de035162d1bf7593e5b45c95e38
[INFO] running `"docker" "start" "-a" "02e5f5c84a443d02a9193ffb2bc34064a0037de035162d1bf7593e5b45c95e38"`
[INFO] [stderr]    Compiling remove_dir_all v0.5.1
[INFO] [stderr]     Checking spin v0.4.10
[INFO] [stderr]     Checking volatile v0.2.5
[INFO] [stderr]     Checking x86_64 v0.2.14
[INFO] [stderr]     Checking lazy_static v1.2.0
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling skeptic v0.5.0
[INFO] [stderr]    Compiling fixedvec v0.2.3
[INFO] [stderr]     Checking bootloader v0.3.10
[INFO] [stderr]     Checking lk_os v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0433]: failed to resolve: maybe a missing `extern crate core;`?
[INFO] [stderr]   --> src/vga_buffer.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     use core::fmt::Write;
[INFO] [stderr]    |         ^^^^ maybe a missing `extern crate core;`?
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: maybe a missing `extern crate core;`?
[INFO] [stderr]   --> src/main.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use core::panic::PanicInfo;
[INFO] [stderr]    |     ^^^^ maybe a missing `extern crate core;`?
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `core`
[INFO] [stderr]    --> src/vga_buffer.rs:127:5
[INFO] [stderr]     |
[INFO] [stderr] 127 | use core::fmt;
[INFO] [stderr]     |     ^^^^ maybe a missing `extern crate core;`?
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0433.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `lk_os`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "02e5f5c84a443d02a9193ffb2bc34064a0037de035162d1bf7593e5b45c95e38"`
[INFO] running `"docker" "rm" "-f" "02e5f5c84a443d02a9193ffb2bc34064a0037de035162d1bf7593e5b45c95e38"`
[INFO] [stdout] 02e5f5c84a443d02a9193ffb2bc34064a0037de035162d1bf7593e5b45c95e38