[INFO] fetching crate trees 0.4.2...
[INFO] checking trees-0.4.2 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate trees 0.4.2 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate trees 0.4.2 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 trees 0.4.2
[INFO] finished tweaking crates.io crate trees 0.4.2
[INFO] tweaked toml for crates.io crate trees 0.4.2 written to /workspace/builds/worker-5-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] 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-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] d5bc87751b3741466edd77defe873d63b38dc8987dce9260d5fb122b3cb46ba2
[INFO] running `Command { std: "docker" "start" "-a" "d5bc87751b3741466edd77defe873d63b38dc8987dce9260d5fb122b3cb46ba2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d5bc87751b3741466edd77defe873d63b38dc8987dce9260d5fb122b3cb46ba2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5bc87751b3741466edd77defe873d63b38dc8987dce9260d5fb122b3cb46ba2", kill_on_drop: false }`
[INFO] [stdout] d5bc87751b3741466edd77defe873d63b38dc8987dce9260d5fb122b3cb46ba2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] bce0de1e3ece4144491ec43eb328c33007dfa35d7703bbed568838f4f00d0d72
[INFO] running `Command { std: "docker" "start" "-a" "bce0de1e3ece4144491ec43eb328c33007dfa35d7703bbed568838f4f00d0d72", kill_on_drop: false }`
[INFO] [stderr]     Checking trees v0.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/node_vec.rs:76:39
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 let offset = offsets[ (depth-1) ] + Tuple::descendants( depth-2 );
[INFO] [stdout]    |                                       ^       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 76 -                 let offset = offsets[ (depth-1) ] + Tuple::descendants( depth-2 );
[INFO] [stdout] 76 +                 let offset = offsets[ depth-1 ] + Tuple::descendants( depth-2 );
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around index expression
[INFO] [stdout]   --> src/node_vec.rs:76:39
[INFO] [stdout]    |
[INFO] [stdout] 76 |                 let offset = offsets[ (depth-1) ] + Tuple::descendants( depth-2 );
[INFO] [stdout]    |                                       ^       ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 76 -                 let offset = offsets[ (depth-1) ] + Tuple::descendants( depth-2 );
[INFO] [stdout] 76 +                 let offset = offsets[ depth-1 ] + Tuple::descendants( depth-2 );
[INFO] [stdout]    |
[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 2.55s
[INFO] running `Command { std: "docker" "inspect" "bce0de1e3ece4144491ec43eb328c33007dfa35d7703bbed568838f4f00d0d72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bce0de1e3ece4144491ec43eb328c33007dfa35d7703bbed568838f4f00d0d72", kill_on_drop: false }`
[INFO] [stdout] bce0de1e3ece4144491ec43eb328c33007dfa35d7703bbed568838f4f00d0d72