[INFO] fetching crate wasm-message-passing-3nweb 0.2.0...
[INFO] checking wasm-message-passing-3nweb-0.2.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate wasm-message-passing-3nweb 0.2.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate wasm-message-passing-3nweb 0.2.0 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 wasm-message-passing-3nweb 0.2.0
[INFO] finished tweaking crates.io crate wasm-message-passing-3nweb 0.2.0
[INFO] tweaked toml for crates.io crate wasm-message-passing-3nweb 0.2.0 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 14 packages
[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]     Blocking waiting for file lock on package cache
[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] c5efa5f13cc1e50d5dca5e04537419b7c45b1e9116ccc04d4d37776a13fb36e7
[INFO] running `Command { std: "docker" "start" "-a" "c5efa5f13cc1e50d5dca5e04537419b7c45b1e9116ccc04d4d37776a13fb36e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c5efa5f13cc1e50d5dca5e04537419b7c45b1e9116ccc04d4d37776a13fb36e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c5efa5f13cc1e50d5dca5e04537419b7c45b1e9116ccc04d4d37776a13fb36e7", kill_on_drop: false }`
[INFO] [stdout] c5efa5f13cc1e50d5dca5e04537419b7c45b1e9116ccc04d4d37776a13fb36e7
[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] e8b5b7369c0660e9ee39edb8c9038336cfca4b1e3216540f4639bf17ab723d29
[INFO] running `Command { std: "docker" "start" "-a" "e8b5b7369c0660e9ee39edb8c9038336cfca4b1e3216540f4639bf17ab723d29", kill_on_drop: false }`
[INFO] [stderr]     Checking wasm-message-passing-3nweb v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/wasm_mp1.rs:58:2
[INFO] [stdout]    |
[INFO] [stdout] 58 | /     /// This simple classic externing expects to find these functions in `env`
[INFO] [stdout] 59 | |     /// object/namespace imported to WASM by embedding.
[INFO] [stdout] 60 | |     /// 
[INFO] [stdout]    | |________^
[INFO] [stdout] 61 | /     extern {
[INFO] [stdout] 62 | |
[INFO] [stdout] 63 | |         /// Don't use this directly.
[INFO] [stdout] 64 | |         /// WASM embedding is expected to provide this function in accordance with
[INFO] [stdout] ...  |
[INFO] [stdout] 88 | |
[INFO] [stdout] 89 | |     }
[INFO] [stdout]    | |_____- rustdoc does not generate documentation for extern blocks
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/wasm_mp1.rs:58:2
[INFO] [stdout]    |
[INFO] [stdout] 58 | /     /// This simple classic externing expects to find these functions in `env`
[INFO] [stdout] 59 | |     /// object/namespace imported to WASM by embedding.
[INFO] [stdout] 60 | |     /// 
[INFO] [stdout]    | |________^
[INFO] [stdout] 61 | /     extern {
[INFO] [stdout] 62 | |
[INFO] [stdout] 63 | |         /// Don't use this directly.
[INFO] [stdout] 64 | |         /// WASM embedding is expected to provide this function in accordance with
[INFO] [stdout] ...  |
[INFO] [stdout] 88 | |
[INFO] [stdout] 89 | |     }
[INFO] [stdout]    | |_____- rustdoc does not generate documentation for extern blocks
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.15s
[INFO] running `Command { std: "docker" "inspect" "e8b5b7369c0660e9ee39edb8c9038336cfca4b1e3216540f4639bf17ab723d29", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e8b5b7369c0660e9ee39edb8c9038336cfca4b1e3216540f4639bf17ab723d29", kill_on_drop: false }`
[INFO] [stdout] e8b5b7369c0660e9ee39edb8c9038336cfca4b1e3216540f4639bf17ab723d29