[INFO] fetching crate g-k-crates-io-client 0.27.1...
[INFO] checking g-k-crates-io-client-0.27.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate g-k-crates-io-client 0.27.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate g-k-crates-io-client 0.27.1 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 g-k-crates-io-client 0.27.1
[INFO] finished tweaking crates.io crate g-k-crates-io-client 0.27.1
[INFO] tweaked toml for crates.io crate g-k-crates-io-client 0.27.1 written to /workspace/builds/worker-4-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 58 packages
[INFO] [stderr]       Adding bytes v0.4.12 (latest: v1.6.0)
[INFO] [stderr]       Adding http v0.1.21 (latest: v1.1.0)
[INFO] [stderr]       Adding idna v0.1.5 (latest: v0.5.0)
[INFO] [stderr]       Adding itoa v0.4.8 (latest: v1.0.11)
[INFO] [stderr]       Adding object v0.32.2 (latest: v0.34.0)
[INFO] [stderr]       Adding percent-encoding v1.0.1 (latest: v2.3.1)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[INFO] [stderr]       Adding synstructure v0.12.6 (latest: v0.13.1)
[INFO] [stderr]       Adding url v1.7.2 (latest: v2.5.0)
[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-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] a7602ef95f16b30e3df8ac7bee2df4c25b65abccf0fd85a2e7fbf0f76ff7c75a
[INFO] running `Command { std: "docker" "start" "-a" "a7602ef95f16b30e3df8ac7bee2df4c25b65abccf0fd85a2e7fbf0f76ff7c75a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7602ef95f16b30e3df8ac7bee2df4c25b65abccf0fd85a2e7fbf0f76ff7c75a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7602ef95f16b30e3df8ac7bee2df4c25b65abccf0fd85a2e7fbf0f76ff7c75a", kill_on_drop: false }`
[INFO] [stdout] a7602ef95f16b30e3df8ac7bee2df4c25b65abccf0fd85a2e7fbf0f76ff7c75a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 86b6e7a8a35214b50a9c08bb3050cb92a1ac5bfb2fc92a48c896c3b47177201a
[INFO] running `Command { std: "docker" "start" "-a" "86b6e7a8a35214b50a9c08bb3050cb92a1ac5bfb2fc92a48c896c3b47177201a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libz-sys v1.1.16
[INFO] [stderr]    Compiling openssl-sys v0.9.102
[INFO] [stderr]    Compiling curl-sys v0.4.72+curl-8.6.0
[INFO] [stderr]    Compiling backtrace v0.3.71
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]    Compiling syn v2.0.58
[INFO] [stderr]     Checking unicode-normalization v0.1.23
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]     Checking unicode-bidi v0.3.15
[INFO] [stderr]    Compiling curl v0.4.46
[INFO] [stderr]     Checking matches v0.1.10
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking socket2 v0.5.6
[INFO] [stderr]     Checking percent-encoding v1.0.1
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking http v0.1.21
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]    Compiling serde_derive v1.0.197
[INFO] [stderr]     Checking serde v1.0.197
[INFO] [stderr]     Checking serde_json v1.0.115
[INFO] [stderr]     Checking g-k-crates-io-client v0.27.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `serde_json` is imported redundantly
[INFO] [stdout]   --> lib.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^ the item `serde_json` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde_json` is imported redundantly
[INFO] [stdout]   --> lib.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^ the item `serde_json` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` 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 7.51s
[INFO] running `Command { std: "docker" "inspect" "86b6e7a8a35214b50a9c08bb3050cb92a1ac5bfb2fc92a48c896c3b47177201a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86b6e7a8a35214b50a9c08bb3050cb92a1ac5bfb2fc92a48c896c3b47177201a", kill_on_drop: false }`
[INFO] [stdout] 86b6e7a8a35214b50a9c08bb3050cb92a1ac5bfb2fc92a48c896c3b47177201a