[INFO] fetching crate rust-demo-rgrep 0.1.0...
[INFO] building rust-demo-rgrep-0.1.0 against try#d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6 for pr-146237-1
[INFO] extracting crate rust-demo-rgrep 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate rust-demo-rgrep 0.1.0
[INFO] finished tweaking crates.io crate rust-demo-rgrep 0.1.0
[INFO] tweaked toml for crates.io crate rust-demo-rgrep 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rust-demo-rgrep 0.1.0 on toolchain d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rust-demo-rgrep 0.1.0 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" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 267724a1e91e4935893eb4553f1e9c653ba1cad27f8c2c47d98207581cae97d5
[INFO] running `Command { std: "docker" "start" "-a" "267724a1e91e4935893eb4553f1e9c653ba1cad27f8c2c47d98207581cae97d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "267724a1e91e4935893eb4553f1e9c653ba1cad27f8c2c47d98207581cae97d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "267724a1e91e4935893eb4553f1e9c653ba1cad27f8c2c47d98207581cae97d5", kill_on_drop: false }`
[INFO] [stdout] 267724a1e91e4935893eb4553f1e9c653ba1cad27f8c2c47d98207581cae97d5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dc68ec27b5ea0e8dd105a62bfaf84a419f2f58353cdb80b7fd9c45701cc36b29
[INFO] running `Command { std: "docker" "start" "-a" "dc68ec27b5ea0e8dd105a62bfaf84a419f2f58353cdb80b7fd9c45701cc36b29", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]    Compiling memchr v2.7.1
[INFO] [stderr]    Compiling regex-syntax v0.8.2
[INFO] [stderr]    Compiling anstyle v1.0.6
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling anstyle-parse v0.2.3
[INFO] [stderr]    Compiling anstyle-query v1.0.2
[INFO] [stderr]    Compiling portable-atomic v1.6.0
[INFO] [stderr]    Compiling unicode-width v0.1.11
[INFO] [stderr]    Compiling anstream v0.6.12
[INFO] [stderr]    Compiling strsim v0.11.0
[INFO] [stderr]    Compiling log v0.4.20
[INFO] [stderr]    Compiling anyhow v1.0.80
[INFO] [stderr]    Compiling aho-corasick v1.1.2
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling clap_builder v4.5.1
[INFO] [stderr]    Compiling humantime v2.1.0
[INFO] [stderr]    Compiling syn v2.0.50
[INFO] [stderr]    Compiling console v0.15.8
[INFO] [stderr]    Compiling regex-automata v0.4.5
[INFO] [stderr]    Compiling indicatif v0.17.8
[INFO] [stderr]    Compiling regex v1.10.3
[INFO] [stderr]    Compiling clap_derive v4.5.0
[INFO] [stderr]    Compiling env_filter v0.1.0
[INFO] [stderr]    Compiling env_logger v0.11.2
[INFO] [stderr]    Compiling clap v4.5.1
[INFO] [stderr]    Compiling rust-demo-rgrep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/lib.rs:5:13
[INFO] [stdout]   |
[INFO] [stdout] 5 |             writeln!(writer, "{}", line);
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 5 |             let _ = writeln!(writer, "{}", line);
[INFO] [stdout]   |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 28.62s
[INFO] running `Command { std: "docker" "inspect" "dc68ec27b5ea0e8dd105a62bfaf84a419f2f58353cdb80b7fd9c45701cc36b29", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc68ec27b5ea0e8dd105a62bfaf84a419f2f58353cdb80b7fd9c45701cc36b29", kill_on_drop: false }`
[INFO] [stdout] dc68ec27b5ea0e8dd105a62bfaf84a419f2f58353cdb80b7fd9c45701cc36b29
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8fb620c3fcde39fb718cb414ae102bb707e6fb6e19d898b9939c76d883aae9e8
[INFO] running `Command { std: "docker" "start" "-a" "8fb620c3fcde39fb718cb414ae102bb707e6fb6e19d898b9939c76d883aae9e8", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.7.1
[INFO] [stderr]    Compiling regex-syntax v0.8.2
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]    Compiling predicates-core v1.0.6
[INFO] [stderr]    Compiling rustix v0.38.31
[INFO] [stderr]    Compiling bitflags v2.4.2
[INFO] [stderr]    Compiling walkdir v2.4.0
[INFO] [stderr]    Compiling difflib v0.4.0
[INFO] [stderr]    Compiling normalize-line-endings v0.3.0
[INFO] [stderr]    Compiling termtree v0.4.1
[INFO] [stderr]    Compiling linux-raw-sys v0.4.13
[INFO] [stderr]    Compiling predicates-tree v1.0.9
[INFO] [stderr]    Compiling aho-corasick v1.1.2
[INFO] [stderr]    Compiling fastrand v2.0.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.18
[INFO] [stderr]    Compiling assert_cmd v2.0.14
[INFO] [stderr]    Compiling wait-timeout v0.2.0
[INFO] [stderr]    Compiling crossbeam-deque v0.8.5
[INFO] [stderr]    Compiling float-cmp v0.9.0
[INFO] [stderr]    Compiling regex-automata v0.4.5
[INFO] [stderr]    Compiling tempfile v3.10.1
[INFO] [stderr]    Compiling regex v1.10.3
[INFO] [stderr]    Compiling bstr v1.9.1
[INFO] [stderr]    Compiling env_filter v0.1.0
[INFO] [stderr]    Compiling predicates v3.1.0
[INFO] [stderr]    Compiling globset v0.4.14
[INFO] [stderr]    Compiling env_logger v0.11.2
[INFO] [stderr]    Compiling ignore v0.4.22
[INFO] [stderr]    Compiling rust-demo-rgrep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/lib.rs:5:13
[INFO] [stdout]   |
[INFO] [stdout] 5 |             writeln!(writer, "{}", line);
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 5 |             let _ = writeln!(writer, "{}", line);
[INFO] [stdout]   |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling globwalk v0.9.1
[INFO] [stderr]    Compiling assert_fs v1.1.1
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]  --> src/lib.rs:5:13
[INFO] [stdout]   |
[INFO] [stdout] 5 |             writeln!(writer, "{}", line);
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]   |
[INFO] [stdout] 5 |             let _ = writeln!(writer, "{}", line);
[INFO] [stdout]   |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 25.81s
[INFO] running `Command { std: "docker" "inspect" "8fb620c3fcde39fb718cb414ae102bb707e6fb6e19d898b9939c76d883aae9e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8fb620c3fcde39fb718cb414ae102bb707e6fb6e19d898b9939c76d883aae9e8", kill_on_drop: false }`
[INFO] [stdout] 8fb620c3fcde39fb718cb414ae102bb707e6fb6e19d898b9939c76d883aae9e8