[INFO] cloning repository https://github.com/nicmr/spren_os
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nicmr/spren_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnicmr%2Fspren_os"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnicmr%2Fspren_os'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8beab388756cc652bb1cb182732dd7a236f2f58b
[INFO] checking nicmr/spren_os against master#783139bd8fc3b94fac9a1bf81bba2c506e8221b6 for pr-72644
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnicmr%2Fspren_os" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nicmr/spren_os on toolchain 783139bd8fc3b94fac9a1bf81bba2c506e8221b6
[INFO] running `"/workspace/cargo-home/bin/cargo" "+783139bd8fc3b94fac9a1bf81bba2c506e8221b6" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/nicmr/spren_os
[INFO] finished tweaking git repo https://github.com/nicmr/spren_os
[INFO] tweaked toml for git repo https://github.com/nicmr/spren_os written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/nicmr/spren_os already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+783139bd8fc3b94fac9a1bf81bba2c506e8221b6" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=forbid" "-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" "+783139bd8fc3b94fac9a1bf81bba2c506e8221b6" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 62213bf5ca30dfcb9378f1d95c82a038a4082ae1d631feb825d4f8bb6f526286
[INFO] running `"docker" "start" "-a" "62213bf5ca30dfcb9378f1d95c82a038a4082ae1d631feb825d4f8bb6f526286"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking volatile v0.2.4
[INFO] [stderr]     Checking spren_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0557]: feature has been removed
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(panic_implementation)]
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stderr]   |
[INFO] [stderr]   = note: subsumed by `#[panic_handler]`
[INFO] [stderr] 
[INFO] [stderr] error[E0557]: feature has been removed
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(panic_implementation)]
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^ feature has been removed
[INFO] [stderr]   |
[INFO] [stderr]   = note: subsumed by `#[panic_handler]`
[INFO] [stderr] 
[INFO] [stderr] error: cannot find attribute `panic_implementation` in this scope
[INFO] [stderr]   --> src/main.rs:14:3
[INFO] [stderr]    |
[INFO] [stderr] 14 | #[panic_implementation]
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/vga_buffer.rs:83:21
[INFO] [stderr]    |
[INFO] [stderr] 83 |                 0x20...0x7e | b'\n' => self.write_byte(byte),
[INFO] [stderr]    |                     ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: cannot find attribute `panic_implementation` in this scope
[INFO] [stderr]   --> src/main.rs:14:3
[INFO] [stderr]    |
[INFO] [stderr] 14 | #[panic_implementation]
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/vga_buffer.rs:83:21
[INFO] [stderr]    |
[INFO] [stderr] 83 |                 0x20...0x7e | b'\n' => self.write_byte(byte),
[INFO] [stderr]    |                     ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: `#[panic_handler]` function required, but not found
[INFO] [stderr] 
[INFO] [stderr] error: language item required, but not found: `eh_personality`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0557`.
[INFO] [stderr] error: aborting due to 4 previous errors; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0557`.
[INFO] [stderr] error: could not compile `spren_os`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "62213bf5ca30dfcb9378f1d95c82a038a4082ae1d631feb825d4f8bb6f526286"`
[INFO] running `"docker" "rm" "-f" "62213bf5ca30dfcb9378f1d95c82a038a4082ae1d631feb825d4f8bb6f526286"`
[INFO] [stdout] 62213bf5ca30dfcb9378f1d95c82a038a4082ae1d631feb825d4f8bb6f526286