[INFO] fetching crate bolero-kani 0.10.0...
[INFO] checking bolero-kani-0.10.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate bolero-kani 0.10.0 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate bolero-kani 0.10.0 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "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-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bolero-generator v0.10.2
[INFO] [stderr]   Downloaded pretty-hex v0.3.0
[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-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] db9edfa529f79320c18bf379c594bafa584283e372593d82eba913b9a8d1e0e2
[INFO] running `Command { std: "docker" "start" "-a" "db9edfa529f79320c18bf379c594bafa584283e372593d82eba913b9a8d1e0e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "db9edfa529f79320c18bf379c594bafa584283e372593d82eba913b9a8d1e0e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db9edfa529f79320c18bf379c594bafa584283e372593d82eba913b9a8d1e0e2", kill_on_drop: false }`
[INFO] [stdout] db9edfa529f79320c18bf379c594bafa584283e372593d82eba913b9a8d1e0e2
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3a15f7938b82d1a2eac9563f39089a294542367c5e83cd2484047611fdc23811
[INFO] running `Command { std: "docker" "start" "-a" "3a15f7938b82d1a2eac9563f39089a294542367c5e83cd2484047611fdc23811", kill_on_drop: false }`
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking pretty-hex v0.3.0
[INFO] [stderr]    Compiling backtrace v0.3.71
[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 2.34s
[INFO] running `Command { std: "docker" "inspect" "3a15f7938b82d1a2eac9563f39089a294542367c5e83cd2484047611fdc23811", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a15f7938b82d1a2eac9563f39089a294542367c5e83cd2484047611fdc23811", kill_on_drop: false }`
[INFO] [stdout] 3a15f7938b82d1a2eac9563f39089a294542367c5e83cd2484047611fdc23811