[INFO] fetching crate nuit 0.0.3...
[INFO] checking nuit-0.0.3 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate nuit 0.0.3 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate nuit 0.0.3 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 nuit 0.0.3
[INFO] finished tweaking crates.io crate nuit 0.0.3
[INFO] tweaked toml for crates.io crate nuit 0.0.3 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate nuit 0.0.3 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 nuit-core v0.0.3
[INFO] [stderr]   Downloaded nuit-derive v0.0.3
[INFO] [stderr]   Downloaded nuit-bridge-swiftui v0.0.3
[INFO] [stderr]   Downloaded serde v1.0.183
[INFO] [stderr]   Downloaded serde_derive v1.0.183
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 456c6b15caa1eefcb091ad22a0dcf03ceb22a8dec534cac2470fd9b161abb5cb
[INFO] running `Command { std: "docker" "start" "-a" "456c6b15caa1eefcb091ad22a0dcf03ceb22a8dec534cac2470fd9b161abb5cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "456c6b15caa1eefcb091ad22a0dcf03ceb22a8dec534cac2470fd9b161abb5cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "456c6b15caa1eefcb091ad22a0dcf03ceb22a8dec534cac2470fd9b161abb5cb", kill_on_drop: false }`
[INFO] [stdout] 456c6b15caa1eefcb091ad22a0dcf03ceb22a8dec534cac2470fd9b161abb5cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] cf7b43206c03b73d8674a906b7184a8a95cf00da801f34ee5b5390d135a54ba8
[INFO] running `Command { std: "docker" "start" "-a" "cf7b43206c03b73d8674a906b7184a8a95cf00da801f34ee5b5390d135a54ba8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.66
[INFO] [stderr]    Compiling serde v1.0.183
[INFO] [stderr]    Compiling unicode-ident v1.0.11
[INFO] [stderr]    Compiling serde_derive v1.0.183
[INFO] [stderr]    Compiling serde_json v1.0.104
[INFO] [stderr]     Checking ryu v1.0.15
[INFO] [stderr]     Checking itoa v1.0.9
[INFO] [stderr]    Compiling quote v1.0.32
[INFO] [stderr]    Compiling syn v2.0.28
[INFO] [stderr]    Compiling nuit-derive v0.0.3
[INFO] [stderr]     Checking nuit-core v0.0.3
[INFO] [stderr]     Checking nuit v0.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `c_root`
[INFO] [stdout]   --> src/lib.rs:28:17
[INFO] [stdout]    |
[INFO] [stdout] 28 |             let c_root = CRoot::from(Box::new(root));
[INFO] [stdout]    |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_c_root`
[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] [stdout] warning: unused variable: `c_root`
[INFO] [stdout]   --> src/lib.rs:28:17
[INFO] [stdout]    |
[INFO] [stdout] 28 |             let c_root = CRoot::from(Box::new(root));
[INFO] [stdout]    |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_c_root`
[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 10.28s
[INFO] running `Command { std: "docker" "inspect" "cf7b43206c03b73d8674a906b7184a8a95cf00da801f34ee5b5390d135a54ba8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf7b43206c03b73d8674a906b7184a8a95cf00da801f34ee5b5390d135a54ba8", kill_on_drop: false }`
[INFO] [stdout] cf7b43206c03b73d8674a906b7184a8a95cf00da801f34ee5b5390d135a54ba8