[INFO] fetching crate grepox 0.2.19...
[INFO] checking grepox-0.2.19 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate grepox 0.2.19 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate grepox 0.2.19 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-2-tc1/source/.cargo/config.toml
[INFO] started tweaking crates.io crate grepox 0.2.19
[INFO] finished tweaking crates.io crate grepox 0.2.19
[INFO] tweaked toml for crates.io crate grepox 0.2.19 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate crates.io crate grepox 0.2.19 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded once_cell v1.16.0
[INFO] [stderr]   Downloaded mimalloc v0.1.30
[INFO] [stderr]   Downloaded naive_opt v0.1.18
[INFO] [stderr]   Downloaded semver v1.0.7
[INFO] [stderr]   Downloaded memx v0.1.20
[INFO] [stderr]   Downloaded serde v1.0.147
[INFO] [stderr]   Downloaded bstr v1.0.1
[INFO] [stderr]   Downloaded libc v0.2.121
[INFO] [stderr]   Downloaded libmimalloc-sys v0.1.26
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 17c5795a02c527f80c24ea00cd6318dd84a18a3c013e9e75a2da33db25b7b5fd
[INFO] running `Command { std: "docker" "start" "-a" "17c5795a02c527f80c24ea00cd6318dd84a18a3c013e9e75a2da33db25b7b5fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "17c5795a02c527f80c24ea00cd6318dd84a18a3c013e9e75a2da33db25b7b5fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17c5795a02c527f80c24ea00cd6318dd84a18a3c013e9e75a2da33db25b7b5fd", kill_on_drop: false }`
[INFO] [stdout] 17c5795a02c527f80c24ea00cd6318dd84a18a3c013e9e75a2da33db25b7b5fd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ca46532d7d1a266abeedf107043f5758655102b005ebedf9a518f3c2a8f94098
[INFO] running `Command { std: "docker" "start" "-a" "ca46532d7d1a266abeedf107043f5758655102b005ebedf9a518f3c2a8f94098", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v1.0.7
[INFO] [stderr]    Compiling libc v0.2.121
[INFO] [stderr]     Checking once_cell v1.16.0
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking regex-syntax v0.6.27
[INFO] [stderr]    Compiling libmimalloc-sys v0.1.26
[INFO] [stderr]     Checking aho-corasick v0.7.19
[INFO] [stderr]     Checking bstr v1.0.1
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling memx v0.1.20
[INFO] [stderr]     Checking mimalloc v0.1.30
[INFO] [stderr]     Checking regex v1.6.0
[INFO] [stderr]     Checking naive_opt v0.1.18
[INFO] [stderr]     Checking grepox v0.2.19 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `insert_bytes` is never used
[INFO] [stdout]    --> src/main.rs:589:8
[INFO] [stdout]     |
[INFO] [stdout] 588 | trait InsertBytes {
[INFO] [stdout]     |       ----------- method in this trait
[INFO] [stdout] 589 |     fn insert_bytes(&mut self, idx: usize, bytes: &[u8]);
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `insert_bytes` is never used
[INFO] [stdout]    --> src/main.rs:589:8
[INFO] [stdout]     |
[INFO] [stdout] 588 | trait InsertBytes {
[INFO] [stdout]     |       ----------- method in this trait
[INFO] [stdout] 589 |     fn insert_bytes(&mut self, idx: usize, bytes: &[u8]);
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.69s
[INFO] running `Command { std: "docker" "inspect" "ca46532d7d1a266abeedf107043f5758655102b005ebedf9a518f3c2a8f94098", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca46532d7d1a266abeedf107043f5758655102b005ebedf9a518f3c2a8f94098", kill_on_drop: false }`
[INFO] [stdout] ca46532d7d1a266abeedf107043f5758655102b005ebedf9a518f3c2a8f94098