[INFO] fetching crate guard 0.5.2...
[INFO] checking guard-0.5.2 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate guard 0.5.2 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate guard 0.5.2 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 guard 0.5.2
[INFO] finished tweaking crates.io crate guard 0.5.2
[INFO] tweaked toml for crates.io crate guard 0.5.2 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate crates.io crate guard 0.5.2 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] 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cc23b059c6d6399f9cc6799ab3581d5576edb1ff06ca82c396d4fcce7a3d5888
[INFO] running `Command { std: "docker" "start" "-a" "cc23b059c6d6399f9cc6799ab3581d5576edb1ff06ca82c396d4fcce7a3d5888", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cc23b059c6d6399f9cc6799ab3581d5576edb1ff06ca82c396d4fcce7a3d5888", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc23b059c6d6399f9cc6799ab3581d5576edb1ff06ca82c396d4fcce7a3d5888", kill_on_drop: false }`
[INFO] [stdout] cc23b059c6d6399f9cc6799ab3581d5576edb1ff06ca82c396d4fcce7a3d5888
[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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 64332182e98bae4e5402dc6c64815c315d9ee67de37864b053777b0211354ffe
[INFO] running `Command { std: "docker" "start" "-a" "64332182e98bae4e5402dc6c64815c315d9ee67de37864b053777b0211354ffe", kill_on_drop: false }`
[INFO] [stderr]     Checking guard v0.5.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "64332182e98bae4e5402dc6c64815c315d9ee67de37864b053777b0211354ffe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64332182e98bae4e5402dc6c64815c315d9ee67de37864b053777b0211354ffe", kill_on_drop: false }`
[INFO] [stdout] 64332182e98bae4e5402dc6c64815c315d9ee67de37864b053777b0211354ffe