[INFO] cloning repository akritrime/toy-os
[INFO] running `"git" "clone" "--bare" "git://github.com/akritrime/toy-os.git" "work/cache/sources/gh/akritrime/toy-os"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/akritrime/toy-os'...
[INFO] running `"git" "clone" "work/cache/sources/gh/akritrime/toy-os" "work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/akritrime/toy-os"`
[INFO] [stderr] Cloning into 'work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/akritrime/toy-os'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/akritrime/toy-os" "work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/akritrime/toy-os"`
[INFO] [stderr] Cloning into 'work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/akritrime/toy-os'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 21e13c6edb9c32a04f52af8f1e46575551a07c13
[INFO] sha for GitHub repo akritrime/toy-os: 21e13c6edb9c32a04f52af8f1e46575551a07c13
[INFO] validating manifest of akritrime/toy-os on toolchain master#9f06855064ed06a50c496577b21ca50f92a2e67d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of akritrime/toy-os on toolchain try#d3301713b54af69ca9de941a8c6b0d8287dbd6df
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing akritrime/toy-os
[INFO] finished frobbing akritrime/toy-os
[INFO] frobbed toml for akritrime/toy-os written to work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/akritrime/toy-os/Cargo.toml
[INFO] started frobbing akritrime/toy-os
[INFO] finished frobbing akritrime/toy-os
[INFO] frobbed toml for akritrime/toy-os written to work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/akritrime/toy-os/Cargo.toml
[INFO] crate akritrime/toy-os already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] checking akritrime/toy-os against try#d3301713b54af69ca9de941a8c6b0d8287dbd6df for pr-61874
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61874/worker-2/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/akritrime/toy-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" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] e0eff0861880a59be94e91706b40794b3589166169d0fd43f9ad168f57bcd516
[INFO] running `"docker" "start" "-a" "e0eff0861880a59be94e91706b40794b3589166169d0fd43f9ad168f57bcd516"`
[INFO] [stderr]     Checking rlibc v1.0.0
[INFO] [stderr]     Checking toy_os v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0522]: definition of an unknown language item: `panic_fmt`
[INFO] [stderr]  --> src/main.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | #[lang = "panic_fmt"]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^ definition of unknown language item `panic_fmt`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0522`.
[INFO] [stderr] error: Could not compile `toy_os`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "e0eff0861880a59be94e91706b40794b3589166169d0fd43f9ad168f57bcd516"`
[INFO] running `"docker" "rm" "-f" "e0eff0861880a59be94e91706b40794b3589166169d0fd43f9ad168f57bcd516"`
[INFO] [stdout] e0eff0861880a59be94e91706b40794b3589166169d0fd43f9ad168f57bcd516