[INFO] cloning repository https://github.com/Nanoteck137/nano_os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Nanoteck137/nano_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNanoteck137%2Fnano_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNanoteck137%2Fnano_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7ce03afa1954cb99e1176b6521bead35877aa3a2
[INFO] testing Nanoteck137/nano_os against try#16fbf98f22730e073c09e7b03f0eafb87a295545 for pr-145628-retry-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNanoteck137%2Fnano_os" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Nanoteck137/nano_os
[INFO] finished tweaking git repo https://github.com/Nanoteck137/nano_os
[INFO] tweaked toml for git repo https://github.com/Nanoteck137/nano_os written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Nanoteck137/nano_os on toolchain 16fbf98f22730e073c09e7b03f0eafb87a295545
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Nanoteck137/nano_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 233c59b0661e866e1500ae95b97e88e09a265d35e03af64c1af19c3f61bc0646
[INFO] running `Command { std: "docker" "start" "-a" "233c59b0661e866e1500ae95b97e88e09a265d35e03af64c1af19c3f61bc0646", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "233c59b0661e866e1500ae95b97e88e09a265d35e03af64c1af19c3f61bc0646", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "233c59b0661e866e1500ae95b97e88e09a265d35e03af64c1af19c3f61bc0646", kill_on_drop: false }`
[INFO] [stdout] 233c59b0661e866e1500ae95b97e88e09a265d35e03af64c1af19c3f61bc0646
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8ae67b327c31c41de91dd0a2ce8a1433e6b9d6bc186fca9fdbba6dc14c521cee
[INFO] running `Command { std: "docker" "start" "-a" "8ae67b327c31c41de91dd0a2ce8a1433e6b9d6bc186fca9fdbba6dc14c521cee", kill_on_drop: false }`
[INFO] [stderr]    Compiling nano_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stdout]   --> src/main.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 | /     Command::new("nasm")
[INFO] [stdout] 38 | |         .current_dir(&build_path)
[INFO] [stdout] 39 | |         .args(&[
[INFO] [stdout] 40 | |             "-g",
[INFO] [stdout] ...  |
[INFO] [stdout] 43 | |             "-o", "boot.o"])
[INFO] [stdout] 44 | |         .status()?.success();
[INFO] [stdout]    | |____________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let _ = Command::new("nasm")
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stdout]   --> src/main.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 | /     Command::new("nasm")
[INFO] [stdout] 47 | |         .current_dir(&build_path)
[INFO] [stdout] 48 | |         .args(&[
[INFO] [stdout] 49 | |             "-g",
[INFO] [stdout] ...  |
[INFO] [stdout] 52 | |             "-o", "boot64.o"])
[INFO] [stdout] 53 | |         .status()?.success();
[INFO] [stdout]    | |____________________________^
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let _ = Command::new("nasm")
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stdout]   --> src/main.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | /     Command::new("cargo")
[INFO] [stdout] 64 | |         .current_dir(&kernel_path)
[INFO] [stdout] 65 | |         .args(&[
[INFO] [stdout] 66 | |             "build",
[INFO] [stdout] 67 | |             "--target-dir", kernel_build_path.to_str().unwrap()])
[INFO] [stdout] 68 | |         .status()?.success();
[INFO] [stdout]    | |____________________________^
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let _ = Command::new("cargo")
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stdout]   --> src/main.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 86 | /     Command::new("ld")
[INFO] [stdout] 87 | |         .current_dir(&build_path)
[INFO] [stdout] 88 | |         .args(&[
[INFO] [stdout] 89 | |             "-n", 
[INFO] [stdout] ...  |
[INFO] [stdout] 94 | |             "-o", "kernel.bin"])
[INFO] [stdout] 95 | |         .status()?.success();
[INFO] [stdout]    | |____________________________^
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let _ = Command::new("ld")
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stdout]    --> src/main.rs:101:5
[INFO] [stdout]     |
[INFO] [stdout] 101 | /     Command::new("grub-mkrescue")
[INFO] [stdout] 102 | |         .current_dir(&build_path)
[INFO] [stdout] 103 | |         .args(&[
[INFO] [stdout] 104 | |             "-o", "nanoos.iso",
[INFO] [stdout] 105 | |             "isofiles"])
[INFO] [stdout] 106 | |         .status()?.success();
[INFO] [stdout]     | |____________________________^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 101 |     let _ = Command::new("grub-mkrescue")
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.69s
[INFO] running `Command { std: "docker" "inspect" "8ae67b327c31c41de91dd0a2ce8a1433e6b9d6bc186fca9fdbba6dc14c521cee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ae67b327c31c41de91dd0a2ce8a1433e6b9d6bc186fca9fdbba6dc14c521cee", kill_on_drop: false }`
[INFO] [stdout] 8ae67b327c31c41de91dd0a2ce8a1433e6b9d6bc186fca9fdbba6dc14c521cee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0050f78d2d6e43287dea5c0afc41341d5885f372df29e27f58187332f4046d1f
[INFO] running `Command { std: "docker" "start" "-a" "0050f78d2d6e43287dea5c0afc41341d5885f372df29e27f58187332f4046d1f", kill_on_drop: false }`
[INFO] [stderr]    Compiling nano_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stdout]   --> src/main.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 | /     Command::new("nasm")
[INFO] [stdout] 38 | |         .current_dir(&build_path)
[INFO] [stdout] 39 | |         .args(&[
[INFO] [stdout] 40 | |             "-g",
[INFO] [stdout] ...  |
[INFO] [stdout] 43 | |             "-o", "boot.o"])
[INFO] [stdout] 44 | |         .status()?.success();
[INFO] [stdout]    | |____________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let _ = Command::new("nasm")
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stdout]   --> src/main.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 46 | /     Command::new("nasm")
[INFO] [stdout] 47 | |         .current_dir(&build_path)
[INFO] [stdout] 48 | |         .args(&[
[INFO] [stdout] 49 | |             "-g",
[INFO] [stdout] ...  |
[INFO] [stdout] 52 | |             "-o", "boot64.o"])
[INFO] [stdout] 53 | |         .status()?.success();
[INFO] [stdout]    | |____________________________^
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let _ = Command::new("nasm")
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stdout]   --> src/main.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | /     Command::new("cargo")
[INFO] [stdout] 64 | |         .current_dir(&kernel_path)
[INFO] [stdout] 65 | |         .args(&[
[INFO] [stdout] 66 | |             "build",
[INFO] [stdout] 67 | |             "--target-dir", kernel_build_path.to_str().unwrap()])
[INFO] [stdout] 68 | |         .status()?.success();
[INFO] [stdout]    | |____________________________^
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let _ = Command::new("cargo")
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stdout]   --> src/main.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 86 | /     Command::new("ld")
[INFO] [stdout] 87 | |         .current_dir(&build_path)
[INFO] [stdout] 88 | |         .args(&[
[INFO] [stdout] 89 | |             "-n", 
[INFO] [stdout] ...  |
[INFO] [stdout] 94 | |             "-o", "kernel.bin"])
[INFO] [stdout] 95 | |         .status()?.success();
[INFO] [stdout]    | |____________________________^
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let _ = Command::new("ld")
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stdout]    --> src/main.rs:101:5
[INFO] [stdout]     |
[INFO] [stdout] 101 | /     Command::new("grub-mkrescue")
[INFO] [stdout] 102 | |         .current_dir(&build_path)
[INFO] [stdout] 103 | |         .args(&[
[INFO] [stdout] 104 | |             "-o", "nanoos.iso",
[INFO] [stdout] 105 | |             "isofiles"])
[INFO] [stdout] 106 | |         .status()?.success();
[INFO] [stdout]     | |____________________________^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 101 |     let _ = Command::new("grub-mkrescue")
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `Command { std: "docker" "inspect" "0050f78d2d6e43287dea5c0afc41341d5885f372df29e27f58187332f4046d1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0050f78d2d6e43287dea5c0afc41341d5885f372df29e27f58187332f4046d1f", kill_on_drop: false }`
[INFO] [stdout] 0050f78d2d6e43287dea5c0afc41341d5885f372df29e27f58187332f4046d1f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+16fbf98f22730e073c09e7b03f0eafb87a295545" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 18840a0f139991924b2d2b3b90ff97016faa52bb00ffcc5089ff2faeaf350dec
[INFO] running `Command { std: "docker" "start" "-a" "18840a0f139991924b2d2b3b90ff97016faa52bb00ffcc5089ff2faeaf350dec", kill_on_drop: false }`
[INFO] [stderr] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stderr]   --> src/main.rs:37:5
[INFO] [stderr]    |
[INFO] [stderr] 37 | /     Command::new("nasm")
[INFO] [stderr] 38 | |         .current_dir(&build_path)
[INFO] [stderr] 39 | |         .args(&[
[INFO] [stderr] 40 | |             "-g",
[INFO] [stderr] ...  |
[INFO] [stderr] 43 | |             "-o", "boot.o"])
[INFO] [stderr] 44 | |         .status()?.success();
[INFO] [stderr]    | |____________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let _ = Command::new("nasm")
[INFO] [stderr]    |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stderr]   --> src/main.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 | /     Command::new("nasm")
[INFO] [stderr] 47 | |         .current_dir(&build_path)
[INFO] [stderr] 48 | |         .args(&[
[INFO] [stderr] 49 | |             "-g",
[INFO] [stderr] ...  |
[INFO] [stderr] 52 | |             "-o", "boot64.o"])
[INFO] [stderr] 53 | |         .status()?.success();
[INFO] [stderr]    | |____________________________^
[INFO] [stderr]    |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 46 |     let _ = Command::new("nasm")
[INFO] [stderr]    |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stderr]   --> src/main.rs:63:5
[INFO] [stderr]    |
[INFO] [stderr] 63 | /     Command::new("cargo")
[INFO] [stderr] 64 | |         .current_dir(&kernel_path)
[INFO] [stderr] 65 | |         .args(&[
[INFO] [stderr] 66 | |             "build",
[INFO] [stderr] 67 | |             "--target-dir", kernel_build_path.to_str().unwrap()])
[INFO] [stderr] 68 | |         .status()?.success();
[INFO] [stderr]    | |____________________________^
[INFO] [stderr]    |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 63 |     let _ = Command::new("cargo")
[INFO] [stderr]    |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stderr]   --> src/main.rs:86:5
[INFO] [stderr]    |
[INFO] [stderr] 86 | /     Command::new("ld")
[INFO] [stderr] 87 | |         .current_dir(&build_path)
[INFO] [stderr] 88 | |         .args(&[
[INFO] [stderr] 89 | |             "-n", 
[INFO] [stderr] ...  |
[INFO] [stderr] 94 | |             "-o", "kernel.bin"])
[INFO] [stderr] 95 | |         .status()?.success();
[INFO] [stderr]    | |____________________________^
[INFO] [stderr]    |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 86 |     let _ = Command::new("ld")
[INFO] [stderr]    |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `ExitStatus::success` that must be used
[INFO] [stderr]    --> src/main.rs:101:5
[INFO] [stderr]     |
[INFO] [stderr] 101 | /     Command::new("grub-mkrescue")
[INFO] [stderr] 102 | |         .current_dir(&build_path)
[INFO] [stderr] 103 | |         .args(&[
[INFO] [stderr] 104 | |             "-o", "nanoos.iso",
[INFO] [stderr] 105 | |             "isofiles"])
[INFO] [stderr] 106 | |         .status()?.success();
[INFO] [stderr]     | |____________________________^
[INFO] [stderr]     |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 101 |     let _ = Command::new("grub-mkrescue")
[INFO] [stderr]     |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `nano_os` (bin "nano_os" test) generated 5 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/nano_os-5a7347705d3447fa)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "18840a0f139991924b2d2b3b90ff97016faa52bb00ffcc5089ff2faeaf350dec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18840a0f139991924b2d2b3b90ff97016faa52bb00ffcc5089ff2faeaf350dec", kill_on_drop: false }`
[INFO] [stdout] 18840a0f139991924b2d2b3b90ff97016faa52bb00ffcc5089ff2faeaf350dec