[INFO] fetching crate mdbook 0.4.18...
[INFO] checking mdbook-0.4.18 against try#7306d3110618f84a6a4662b9e2cc4fd0d9b02da8 for pr-97346
[INFO] extracting crate mdbook 0.4.18 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate mdbook 0.4.18 on toolchain 7306d3110618f84a6a4662b9e2cc4fd0d9b02da8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7306d3110618f84a6a4662b9e2cc4fd0d9b02da8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mdbook 0.4.18
[INFO] finished tweaking crates.io crate mdbook 0.4.18
[INFO] tweaked toml for crates.io crate mdbook 0.4.18 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate mdbook 0.4.18 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7306d3110618f84a6a4662b9e2cc4fd0d9b02da8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+7306d3110618f84a6a4662b9e2cc4fd0d9b02da8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a6cac1696f70a5828e505810985ed4f40a69f9f7f8d925a552299830a1292608
[INFO] running `Command { std: "docker" "start" "-a" "a6cac1696f70a5828e505810985ed4f40a69f9f7f8d925a552299830a1292608", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a6cac1696f70a5828e505810985ed4f40a69f9f7f8d925a552299830a1292608", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6cac1696f70a5828e505810985ed4f40a69f9f7f8d925a552299830a1292608", kill_on_drop: false }`
[INFO] [stdout] a6cac1696f70a5828e505810985ed4f40a69f9f7f8d925a552299830a1292608
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "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:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+7306d3110618f84a6a4662b9e2cc4fd0d9b02da8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4411d0f8e5f051f5699b74abc96d2675657cc2def593f1c90e2f7ec3aab1a5d1
[INFO] running `Command { std: "docker" "start" "-a" "4411d0f8e5f051f5699b74abc96d2675657cc2def593f1c90e2f7ec3aab1a5d1", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.100
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[INFO] [stderr]     Checking mdbook v0.4.18 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 03s
[INFO] running `Command { std: "docker" "inspect" "4411d0f8e5f051f5699b74abc96d2675657cc2def593f1c90e2f7ec3aab1a5d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4411d0f8e5f051f5699b74abc96d2675657cc2def593f1c90e2f7ec3aab1a5d1", kill_on_drop: false }`
[INFO] [stdout] 4411d0f8e5f051f5699b74abc96d2675657cc2def593f1c90e2f7ec3aab1a5d1