[INFO] updating cached repository https://github.com/0kaguya/os-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7681e8f435fdda1c0a7bf322ffa496e7497cd305
[INFO] checking 0kaguya/os-rust against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F0kaguya%2Fos-rust" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/0kaguya/os-rust on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/0kaguya/os-rust
[INFO] finished tweaking git repo https://github.com/0kaguya/os-rust
[INFO] tweaked toml for git repo https://github.com/0kaguya/os-rust written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/0kaguya/os-rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+45d050cde277b22a755847338f2acc2c7b834141" "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] f903fb82ef92018a9138b1b5b1e0406d7797d88d21c18a7a5d262c526484400e
[INFO] running `"docker" "start" "-a" "f903fb82ef92018a9138b1b5b1e0406d7797d88d21c18a7a5d262c526484400e"`
[INFO] [stderr]    Compiling libc v0.2.51
[INFO] [stderr]    Compiling remove_dir_all v0.5.1
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling llvm-tools v0.1.1
[INFO] [stderr]     Checking ux v0.1.3
[INFO] [stderr]     Checking bit_field v0.9.0
[INFO] [stderr]     Checking bitflags v1.0.4
[INFO] [stderr]     Checking usize_conversions v0.2.0
[INFO] [stderr]     Checking os_bootinfo v0.2.1
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]     Checking zero v0.1.2
[INFO] [stderr]     Checking font8x8 v0.2.4
[INFO] [stderr]     Checking spin v0.5.0
[INFO] [stderr]     Checking spin v0.4.10
[INFO] [stderr]    Compiling getopts v0.2.18
[INFO] [stderr]     Checking array-init v0.0.4
[INFO] [stderr]     Checking array-init v0.0.3
[INFO] [stderr]     Checking xmas-elf v0.6.2
[INFO] [stderr]    Compiling bootloader v0.5.3
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]    Compiling pulldown-cmark v0.0.3
[INFO] [stderr]    Compiling raw-cpuid v6.1.0
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling skeptic v0.5.0
[INFO] [stderr]    Compiling fixedvec v0.2.3
[INFO] [stderr]     Checking x86_64 v0.3.6
[INFO] [stderr]     Checking x86_64 v0.2.14
[INFO] [stderr]     Checking x86_64 v0.5.4
[INFO] [stderr]     Checking uart_16550 v0.1.0
[INFO] [stderr]     Checking rust_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/vga_buffer.rs:92:22
[INFO] [stderr]    |
[INFO] [stderr] 92 |                 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] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/vga_buffer.rs:92:22
[INFO] [stderr]    |
[INFO] [stderr] 92 |                 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] warning: unused import: `std::io::empty`
[INFO] [stderr]    --> src/vga_buffer.rs:157:9
[INFO] [stderr]     |
[INFO] [stderr] 157 |     use std::io::empty;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Box` is imported redundantly
[INFO] [stderr]    --> src/vga_buffer.rs:160:13
[INFO] [stderr]     |
[INFO] [stderr] 160 |         use std::boxed::Box;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `unused_import`
[INFO] [stderr]  --> src/bin/test-panic.rs:4:25
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![cfg_attr(test, allow(unused_import))]
[INFO] [stderr]   |                         ^^^^^^^^^^^^^ help: did you mean: `unused_imports`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unknown_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/vga_buffer.rs:239:9
[INFO] [stderr]     |
[INFO] [stderr] 239 |         writeln!(writer, "{}", 2.34);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `unused_import`
[INFO] [stderr]  --> src/bin/test-vga-print.rs:3:25
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![cfg_attr(test, allow(unused_import))]
[INFO] [stderr]   |                         ^^^^^^^^^^^^^ help: did you mean: `unused_imports`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unknown_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/vga_buffer.rs:240:9
[INFO] [stderr]     |
[INFO] [stderr] 240 |         writeln!(writer, "{}", "dust");
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `print`, `println`
[INFO] [stderr]  --> src/bin/test-vga-print.rs:6:15
[INFO] [stderr]   |
[INFO] [stderr] 6 | use rust_os::{print, println};
[INFO] [stderr]   |               ^^^^^  ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rust_os::serial_println`
[INFO] [stderr]  --> src/bin/test-vga-print.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use rust_os::serial_println;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rust_os::exit_qemu`
[INFO] [stderr]  --> src/bin/test-vga-print.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use rust_os::exit_qemu;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `core::panic::PanicInfo`
[INFO] [stderr]  --> src/bin/test-panic.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use core::panic::PanicInfo;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `exit_qemu`, `serial_println`
[INFO] [stderr]  --> src/bin/test-panic.rs:7:15
[INFO] [stderr]   |
[INFO] [stderr] 7 | use rust_os::{serial_println, exit_qemu};
[INFO] [stderr]   |               ^^^^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/vga_buffer.rs:92:22
[INFO] [stderr]    |
[INFO] [stderr] 92 |                 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] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/bin/test-panic.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     panic!();
[INFO] [stderr]    |     --------- any code following this expression is unreachable
[INFO] [stderr] 22 | 
[INFO] [stderr] 23 |     unsafe {exit_qemu() }
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 50.92s
[INFO] running `"docker" "inspect" "f903fb82ef92018a9138b1b5b1e0406d7797d88d21c18a7a5d262c526484400e"`
[INFO] running `"docker" "rm" "-f" "f903fb82ef92018a9138b1b5b1e0406d7797d88d21c18a7a5d262c526484400e"`
[INFO] [stdout] f903fb82ef92018a9138b1b5b1e0406d7797d88d21c18a7a5d262c526484400e