[INFO] fetching crate bolero-kani 0.10.0...
[INFO] checking bolero-kani-0.10.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate bolero-kani 0.10.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate bolero-kani 0.10.0 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] started tweaking crates.io crate bolero-kani 0.10.0
[INFO] finished tweaking crates.io crate bolero-kani 0.10.0
[INFO] tweaked toml for crates.io crate bolero-kani 0.10.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 31 packages
[INFO] [stderr]       Adding object v0.32.2 (latest: v0.34.0)
[INFO] [stderr]       Adding pretty-hex v0.3.0 (latest: v0.4.1)
[INFO] [stderr]       Adding proc-macro-crate v1.3.1 (latest: v3.1.0)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[INFO] [stderr]       Adding toml_edit v0.19.15 (latest: v0.22.9)
[INFO] [stderr]       Adding winnow v0.5.40 (latest: v0.6.5)
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded pretty-hex v0.3.0
[INFO] [stderr]   Downloaded bolero-generator v0.10.2
[INFO] [stderr]   Downloaded bolero-engine v0.10.2
[INFO] [stderr]   Downloaded bolero-generator-derive v0.10.0
[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] ee0bde1882052cb6f8d7efafe531ffc3dc4d12c543f6349b6a4e397a82631973
[INFO] running `Command { std: "docker" "start" "-a" "ee0bde1882052cb6f8d7efafe531ffc3dc4d12c543f6349b6a4e397a82631973", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ee0bde1882052cb6f8d7efafe531ffc3dc4d12c543f6349b6a4e397a82631973", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee0bde1882052cb6f8d7efafe531ffc3dc4d12c543f6349b6a4e397a82631973", kill_on_drop: false }`
[INFO] [stdout] ee0bde1882052cb6f8d7efafe531ffc3dc4d12c543f6349b6a4e397a82631973
[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] e2948bc673ab3eeed36931849d5e53293bf8a1be2802f2c547f091a2c3042781
[INFO] running `Command { std: "docker" "start" "-a" "e2948bc673ab3eeed36931849d5e53293bf8a1be2802f2c547f091a2c3042781", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling backtrace v0.3.71
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking pretty-hex v0.3.0
[INFO] [stderr]    Compiling bolero-generator-derive v0.10.0
[INFO] [stderr]     Checking bolero-generator v0.10.2
[INFO] [stderr]     Checking bolero-engine v0.10.2
[INFO] [stderr]     Checking bolero-kani v0.10.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `was_valid`
[INFO] [stdout]   --> src/lib.rs:53:20
[INFO] [stdout]    |
[INFO] [stdout] 53 |                 Ok(was_valid) => {
[INFO] [stdout]    |                    ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_was_valid`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` 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 3.75s
[INFO] running `Command { std: "docker" "inspect" "e2948bc673ab3eeed36931849d5e53293bf8a1be2802f2c547f091a2c3042781", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e2948bc673ab3eeed36931849d5e53293bf8a1be2802f2c547f091a2c3042781", kill_on_drop: false }`
[INFO] [stdout] e2948bc673ab3eeed36931849d5e53293bf8a1be2802f2c547f091a2c3042781