[INFO] cloning repository https://github.com/kk3399/rust-basics
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kk3399/rust-basics" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkk3399%2Frust-basics", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkk3399%2Frust-basics'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] eae73eaca33d04df69ed45126bcb9fc6a55ed701
[INFO] testing kk3399/rust-basics against master#1ddedbaa5919b7b3e70d984660e21e844c615c97 for pr-128400
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkk3399%2Frust-basics" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kk3399/rust-basics on toolchain 1ddedbaa5919b7b3e70d984660e21e844c615c97
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1ddedbaa5919b7b3e70d984660e21e844c615c97" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kk3399/rust-basics
[INFO] finished tweaking git repo https://github.com/kk3399/rust-basics
[INFO] tweaked toml for git repo https://github.com/kk3399/rust-basics written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kk3399/rust-basics 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" "+1ddedbaa5919b7b3e70d984660e21e844c615c97" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1ddedbaa5919b7b3e70d984660e21e844c615c97" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5a1a026a2df3cbfca39d0cd94264a5021e001529a8e1f945f742ccad1bceec75
[INFO] running `Command { std: "docker" "start" "-a" "5a1a026a2df3cbfca39d0cd94264a5021e001529a8e1f945f742ccad1bceec75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5a1a026a2df3cbfca39d0cd94264a5021e001529a8e1f945f742ccad1bceec75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a1a026a2df3cbfca39d0cd94264a5021e001529a8e1f945f742ccad1bceec75", kill_on_drop: false }`
[INFO] [stdout] 5a1a026a2df3cbfca39d0cd94264a5021e001529a8e1f945f742ccad1bceec75
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1ddedbaa5919b7b3e70d984660e21e844c615c97" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0bccaaaaaf30141e3717a46f1b65bede8243c7d724c63f6ada0dbad564ca3318
[INFO] running `Command { std: "docker" "start" "-a" "0bccaaaaaf30141e3717a46f1b65bede8243c7d724c63f6ada0dbad564ca3318", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-basics v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/guess_game.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         io::stdout().flush();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 11 |         let _ = io::stdout().flush();
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `Command { std: "docker" "inspect" "0bccaaaaaf30141e3717a46f1b65bede8243c7d724c63f6ada0dbad564ca3318", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0bccaaaaaf30141e3717a46f1b65bede8243c7d724c63f6ada0dbad564ca3318", kill_on_drop: false }`
[INFO] [stdout] 0bccaaaaaf30141e3717a46f1b65bede8243c7d724c63f6ada0dbad564ca3318
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1ddedbaa5919b7b3e70d984660e21e844c615c97" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 371e414e1c54d0e6deb49094eb15238d46ac67b15682b54fe5e75218231822e7
[INFO] running `Command { std: "docker" "start" "-a" "371e414e1c54d0e6deb49094eb15238d46ac67b15682b54fe5e75218231822e7", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-basics v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/guess_game.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         io::stdout().flush();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 11 |         let _ = io::stdout().flush();
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] running `Command { std: "docker" "inspect" "371e414e1c54d0e6deb49094eb15238d46ac67b15682b54fe5e75218231822e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "371e414e1c54d0e6deb49094eb15238d46ac67b15682b54fe5e75218231822e7", kill_on_drop: false }`
[INFO] [stdout] 371e414e1c54d0e6deb49094eb15238d46ac67b15682b54fe5e75218231822e7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1ddedbaa5919b7b3e70d984660e21e844c615c97" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] fa7e0184fcf885742cc0f2842dd927a67141bcdb942c0ed350ade62963f12587
[INFO] running `Command { std: "docker" "start" "-a" "fa7e0184fcf885742cc0f2842dd927a67141bcdb942c0ed350ade62963f12587", kill_on_drop: false }`
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/guess_game.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |         io::stdout().flush();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 11 |         let _ = io::stdout().flush();
[INFO] [stderr]    |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-basics` (bin "rust-basics" test) generated 1 warning
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_basics-a2e7bd632270400e)
[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" "fa7e0184fcf885742cc0f2842dd927a67141bcdb942c0ed350ade62963f12587", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa7e0184fcf885742cc0f2842dd927a67141bcdb942c0ed350ade62963f12587", kill_on_drop: false }`
[INFO] [stdout] fa7e0184fcf885742cc0f2842dd927a67141bcdb942c0ed350ade62963f12587
[INFO] testing kk3399/rust-basics against try#33f1d8bb92813a1bfc23c093c9f443ab09290307 for pr-128400
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkk3399%2Frust-basics" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kk3399/rust-basics on toolchain 33f1d8bb92813a1bfc23c093c9f443ab09290307
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+33f1d8bb92813a1bfc23c093c9f443ab09290307" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kk3399/rust-basics
[INFO] finished tweaking git repo https://github.com/kk3399/rust-basics
[INFO] tweaked toml for git repo https://github.com/kk3399/rust-basics written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/kk3399/rust-basics 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" "+33f1d8bb92813a1bfc23c093c9f443ab09290307" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+33f1d8bb92813a1bfc23c093c9f443ab09290307" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 26a9320970b3956d8468586d86cf8d4e862d8f1606eb455be5c31da306ec930a
[INFO] running `Command { std: "docker" "start" "-a" "26a9320970b3956d8468586d86cf8d4e862d8f1606eb455be5c31da306ec930a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "26a9320970b3956d8468586d86cf8d4e862d8f1606eb455be5c31da306ec930a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26a9320970b3956d8468586d86cf8d4e862d8f1606eb455be5c31da306ec930a", kill_on_drop: false }`
[INFO] [stdout] 26a9320970b3956d8468586d86cf8d4e862d8f1606eb455be5c31da306ec930a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+33f1d8bb92813a1bfc23c093c9f443ab09290307" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 69315a2fd27441806bbb251d04043bf4c9dd4729687034c69d7750d6a7fb7914
[INFO] running `Command { std: "docker" "start" "-a" "69315a2fd27441806bbb251d04043bf4c9dd4729687034c69d7750d6a7fb7914", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-basics v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/guess_game.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         io::stdout().flush();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 11 |         let _ = io::stdout().flush();
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.28s
[INFO] running `Command { std: "docker" "inspect" "69315a2fd27441806bbb251d04043bf4c9dd4729687034c69d7750d6a7fb7914", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69315a2fd27441806bbb251d04043bf4c9dd4729687034c69d7750d6a7fb7914", kill_on_drop: false }`
[INFO] [stdout] 69315a2fd27441806bbb251d04043bf4c9dd4729687034c69d7750d6a7fb7914
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+33f1d8bb92813a1bfc23c093c9f443ab09290307" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8c2e51c1ca39afdfe8fcfa9ff2877a4a00fed201c2acc0da7fd2edba2cec6346
[INFO] running `Command { std: "docker" "start" "-a" "8c2e51c1ca39afdfe8fcfa9ff2877a4a00fed201c2acc0da7fd2edba2cec6346", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-basics v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/guess_game.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         io::stdout().flush();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 11 |         let _ = io::stdout().flush();
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note: LC_ALL="C" PATH="/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/bin:/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/bin/self-contained:/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/bin:/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/bin/self-contained:/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/bin:/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/bin/self-contained:/opt/rustwide/cargo-home/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" VSLANG="1033" "cc" "-m64" "/tmp/rustc0cyjcD/symbols.o" "/opt/rustwide/target/debug/deps/rust_basics-a2e7bd632270400e.rust_basics.9e46abd324113773-cgu.0.rcgu.o" "/opt/rustwide/target/debug/deps/rust_basics-a2e7bd632270400e.dcbx0omoqyj5294sde6flmkme.rcgu.o" "-Wl,--as-needed" "-L" "/opt/rustwide/target/debug/deps" "-L" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libtest-d2aabef62695c36a.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgetopts-85ffb1adee1b6de7.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunicode_width-47c1d1c97d43fb9c.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_std-767d58143f86b11a.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-9506e3738f23e7c7.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-0e87bdc388165b9b.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-28d2ee21ffecbcd0.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libmemchr-4cd64c3d9fc2560b.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-a1fedeceba4cc892.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-0b8915cbc76cd410.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-fec2ce82fc5b17fa.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-fdb02324b55b2840.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-db981ef273c68b12.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-2c4968ed4cb29e9c.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-661cdd70a5b83118.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-9cbb3bfdc8e63ca5.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-a4c5ad4392a26401.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-9409cd7d030362b9.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-7b90a2705bcf265b.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-80d2f129fb536a6f.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-f72b956e24d1de70.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-632ae0f28c5e55ff.rlib" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-7586cb84705120bb.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-B/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-B/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-B/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-fuse-ld=lld" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-L" "/opt/rustwide/rustup-home/toolchains/33f1d8bb92813a1bfc23c093c9f443ab09290307/lib/rustlib/x86_64-unknown-linux-gnu/lib/self-contained" "-o" "/opt/rustwide/target/debug/deps/rust_basics-a2e7bd632270400e" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
[INFO] [stdout]   = note: PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
[INFO] [stdout]           collect2: fatal error: ld terminated with signal 7 [Bus error], core dumped
[INFO] [stdout]           compilation terminated.
[INFO] [stdout]           
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-basics` (bin "rust-basics" test) due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "8c2e51c1ca39afdfe8fcfa9ff2877a4a00fed201c2acc0da7fd2edba2cec6346", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c2e51c1ca39afdfe8fcfa9ff2877a4a00fed201c2acc0da7fd2edba2cec6346", kill_on_drop: false }`
[INFO] [stdout] 8c2e51c1ca39afdfe8fcfa9ff2877a4a00fed201c2acc0da7fd2edba2cec6346