[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-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/breezykermo/os.phil-opp"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/breezykermo/os.phil-opp'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/breezykermo/os.phil-opp" "work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/breezykermo/os.phil-opp"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/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#e305df1846a6d985315917ae0c81b74af8b4e641
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of breezykermo/os.phil-opp on toolchain try#99a7498759a22b5684caf798a98b7e90ad9d2443
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-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-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/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-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/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/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking breezykermo/os.phil-opp against master#e305df1846a6d985315917ae0c81b74af8b4e641 for pr-60039-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039-1/worker-1/master#e305df1846a6d985315917ae0c81b74af8b4e641:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/breezykermo/os.phil-opp:/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" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 725f4e43e02bdbef6c476a1e7a22c262d5df34615a43bceaa3761052ca91db73
[INFO] running `"docker" "start" "-a" "725f4e43e02bdbef6c476a1e7a22c262d5df34615a43bceaa3761052ca91db73"`
[INFO] [stderr]     Checking x86_64 v0.2.14
[INFO] [stderr]     Checking 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] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "725f4e43e02bdbef6c476a1e7a22c262d5df34615a43bceaa3761052ca91db73"`
[INFO] running `"docker" "rm" "-f" "725f4e43e02bdbef6c476a1e7a22c262d5df34615a43bceaa3761052ca91db73"`
[INFO] [stdout] 725f4e43e02bdbef6c476a1e7a22c262d5df34615a43bceaa3761052ca91db73